The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - A use after free flaw was found in hfsplus_put_super in fs/hfsplus/super.c in the Linux Kernel. This flaw     could allow a local user to cause a denial of service problem. (CVE-2023-2985)

Note that Nessus relies on the presence of the package as reported by the vendor.

The remote Ubuntu 16.04 ESM / 18.04 ESM host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-6342-2 advisory.

    Tavis Ormandy discovered that some AMD processors did not properly handle speculative execution of certain     vector register instructions. A local attacker could use this to expose sensitive information.
    (CVE-2023-20593)

    Zheng Zhang discovered that the device-mapper implementation in the Linux kernel did not properly handle     locking during table_clear() operations. A local attacker could use this to cause a denial of service     (kernel deadlock). (CVE-2023-2269)

    It was discovered that a use-after-free vulnerability existed in the HFS+ file system implementation in     the Linux kernel. A local attacker could possibly use this to cause a denial of service (system crash).
    (CVE-2023-2985)

    It was discovered that the DVB Core driver in the Linux kernel did not properly handle locking events in     certain situations. A local attacker could use this to cause a denial of service (kernel deadlock).
    (CVE-2023-31084)

    It was discovered that the Quick Fair Queueing network scheduler implementation in the Linux kernel     contained an out-of-bounds write vulnerability. A local attacker could use this to cause a denial of     service (system crash) or possibly execute arbitrary code. (CVE-2023-3611)

    It was discovered that the network packet classifier with netfilter/firewall marks implementation in the     Linux kernel did not properly handle reference counting, leading to a use-after-free vulnerability. A     local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary     code. (CVE-2023-3776)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES12 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2023:3324-1 advisory.

  - In the Linux kernel before 4.20.2, kernel/sched/fair.c mishandles leaf cfs_rq's, which allows attackers to     cause a denial of service (infinite loop in update_blocked_averages) or possibly have unspecified other     impact by inducing a high load. (CVE-2018-20784)

  - Systems with microprocessors utilizing speculative execution and speculative execution of memory reads     before the addresses of all prior memory writes are known may allow unauthorized disclosure of information     to an attacker with local user access via a side-channel analysis, aka Speculative Store Bypass (SSB),     Variant 4. (CVE-2018-3639)

  - Information exposure through microarchitectural state after transient execution in certain vector     execution units for some Intel(R) Processors may allow an authenticated user to potentially enable     information disclosure via local access. (CVE-2022-40982)

  - Copy_from_user on 64-bit versions of the Linux kernel does not implement the __uaccess_begin_nospec     allowing a user to bypass the access_ok check and pass a kernel pointer to copy_from_user(). This would     allow an attacker to leak information. We recommend upgrading beyond commit     74e19ef0ff8061ef55957c3abd71614ef0f42f47 (CVE-2023-0459)

  - A flaw that boot CPU could be vulnerable for the speculative execution behavior kind of attacks in the     Linux kernel X86 CPU Power management options functionality was found in the way user resuming CPU from     suspend-to-RAM. A local user could use this flaw to potentially get unauthorized access to some memory of     the CPU similar to the speculative execution behavior kind of attacks. (CVE-2023-1637)

  - A side channel vulnerability on some of the AMD CPUs may allow an attacker to influence the return address     prediction. This may result in speculative execution at an attacker-controlled?address, potentially     leading to information disclosure. (CVE-2023-20569)

  - An issue in Zen 2 CPUs, under specific microarchitectural circumstances, may allow an attacker to     potentially access sensitive information. (CVE-2023-20593)

  - A use after free flaw was found in hfsplus_put_super in fs/hfsplus/super.c in the Linux Kernel. This flaw     could allow a local user to cause a denial of service problem. (CVE-2023-2985)

  - A NULL pointer dereference vulnerability was found in netlink_dump. This issue can occur when the Netlink     socket receives the message(sendmsg) for the XFRM_MSG_GETSA, XFRM_MSG_GETPOLICY type message, and the DUMP     flag is set and can cause a denial of service or possibly another unspecified impact. Due to the nature of     the flaw, privilege escalation cannot be fully ruled out, although it is unlikely. (CVE-2023-3106)

  - An out of bounds (OOB) memory access flaw was found in the Linux kernel in relay_file_read_start_pos in     kernel/relay.c in the relayfs. This flaw could allow a local attacker to crash the system or leak kernel     internal information. (CVE-2023-3268)

  - Linux Kernel nftables Out-Of-Bounds Read/Write Vulnerability; nft_byteorder poorly handled vm register     contents when CAP_NET_ADMIN is in any user or network namespace (CVE-2023-35001)

  - A use-after-free flaw was found in vcs_read in drivers/tty/vt/vc_screen.c in vc_screen in the Linux     Kernel. This flaw allows an attacker with local user access to cause a system crash or leak internal     kernel information. (CVE-2023-3567)

  - An out-of-bounds write vulnerability in the Linux kernel's net/sched: sch_qfq component can be exploited     to achieve local privilege escalation. The qfq_change_agg() function in net/sched/sch_qfq.c allows an out-     of-bounds write because lmax is updated according to packet sizes without bounds checks. We recommend     upgrading past commit 3e337087c3b5805fe0b8a46ba622a962880b5d64. (CVE-2023-3611)

  - A use-after-free vulnerability in the Linux kernel's net/sched: cls_fw component can be exploited to     achieve local privilege escalation. If tcf_change_indev() fails, fw_set_parms() will immediately return an     error after incrementing or decrementing the reference counter in tcf_bind_filter(). If an attacker can     control the reference counter and set it to zero, they can cause the reference to be freed, leading to a     use-after-free vulnerability. We recommend upgrading past commit 0323bce598eea038714f941ce2b22541c46d488f.
    (CVE-2023-3776)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 16.04 ESM host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-6309-1 advisory.

    Zheng Zhang discovered that the device-mapper implementation in the Linux kernel did not properly handle     locking during table_clear() operations. A local attacker could use this to cause a denial of service     (kernel deadlock). (CVE-2023-2269)

    It was discovered that a use-after-free vulnerability existed in the HFS+ file system implementation in     the Linux kernel. A local attacker could possibly use this to cause a denial of service (system crash).
    (CVE-2023-2985)

    It was discovered that the DVB Core driver in the Linux kernel did not properly handle locking events in     certain situations. A local attacker could use this to cause a denial of service (kernel deadlock).
    (CVE-2023-31084)

    It was discovered that the virtual terminal driver in the Linux kernel contained a use-after-free     vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly     expose sensitive information (kernel memory). (CVE-2023-3567)

    It was discovered that the Quick Fair Queueing network scheduler implementation in the Linux kernel     contained an out-of-bounds write vulnerability. A local attacker could use this to cause a denial of     service (system crash) or possibly execute arbitrary code. (CVE-2023-3611)

    It was discovered that the network packet classifier with netfilter/firewall marks implementation in the     Linux kernel did not properly handle reference counting, leading to a use-after-free vulnerability. A     local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary     code. (CVE-2023-3776)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 16.04 ESM / 18.04 ESM host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-6342-1 advisory.

    Tavis Ormandy discovered that some AMD processors did not properly handle speculative execution of certain     vector register instructions. A local attacker could use this to expose sensitive information.
    (CVE-2023-20593)

    Zheng Zhang discovered that the device-mapper implementation in the Linux kernel did not properly handle     locking during table_clear() operations. A local attacker could use this to cause a denial of service     (kernel deadlock). (CVE-2023-2269)

    It was discovered that a use-after-free vulnerability existed in the HFS+ file system implementation in     the Linux kernel. A local attacker could possibly use this to cause a denial of service (system crash).
    (CVE-2023-2985)

    It was discovered that the DVB Core driver in the Linux kernel did not properly handle locking events in     certain situations. A local attacker could use this to cause a denial of service (kernel deadlock).
    (CVE-2023-31084)

    It was discovered that the Quick Fair Queueing network scheduler implementation in the Linux kernel     contained an out-of-bounds write vulnerability. A local attacker could use this to cause a denial of     service (system crash) or possibly execute arbitrary code. (CVE-2023-3611)

    It was discovered that the network packet classifier with netfilter/firewall marks implementation in the     Linux kernel did not properly handle reference counting, leading to a use-after-free vulnerability. A     local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary     code. (CVE-2023-3776)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of kernel installed on the remote host is prior to 4.14.309-231.529. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2023-1987 advisory.

    Detected a few exploitable gadgets that could leak secret memory through a side-channel such as MDS as     well as insufficient hardening of the usercopy functions against spectre-v1. (CVE-2023-0458)

    Use After Free vulnerability in Linux kernel traffic control index filter (tcindex) allows Privilege     Escalation. The imperfect hash area can be updated while packets are traversing, which will cause a use-     after-free when 'tcf_exts_exec()' is called with the destroyed tcf_ext. A local attacker user can use this     vulnerability to elevate its privileges to root.This issue affects Linux Kernel: from 4.14 before git     commit ee059170b1f7e94e55fa6cadee544e176a6e59c2. (CVE-2023-1281)

    A use-after-free vulnerability in the Linux Kernel traffic control index filter (tcindex) can be exploited     to achieve local privilege escalation. The tcindex_delete function which does not properly deactivate     filters in case of a perfect hashes while deleting the underlying structure which can later lead to double     freeing the structure. A local attacker user can use this vulnerability to elevate its privileges to     root.We recommend upgrading past commit 8c710f75256bb3cf05ac7b1672c82b92c43f3d28. (CVE-2023-1829)

    When plain IBRS is enabled (not enhanced IBRS), the logic in spectre_v2_user_select_mitigation()     determines that STIBP is not needed. The IBRS bit implicitly protects against cross-thread branch     targetinjection. However, with legacy IBRS, the IBRS bit is cleared on returning to userspace for     performance reasons which leaves userspace threads vulnerable to cross-thread branch target injection     against which STIBP protects. (CVE-2023-1998)

    A use-after-free flaw was found in iscsi_sw_tcp_session_create in drivers/scsi/iscsi_tcp.c in the SCSI     sub-component in the Linux Kernel. This issue could allow an attacker to leak kernel internal information.
    (CVE-2023-2162)

    In the Linux kernel before 6.1.13, there is a double free in net/mpls/af_mpls.c upon an allocation failure     (for registering the sysctl table under a new location) during the renaming of a device. (CVE-2023-26545)

    A use-after-free flaw was found in hfsplus_put_super in fs/hfsplus/super.c in the Linux Kernel. This flaw     could allow a local user to cause a denial of service. (CVE-2023-2985)

    A flaw was found in the Framebuffer Console (fbcon) in the Linux Kernel. When providing a font->width and     font->height greater than 32 to the fbcon_set_font, since there are no checks in place, a shift-out-of-     bounds occurs, leading to undefined behavior and possible denial of service. (CVE-2023-3161)

    An issue was discovered in drivers/usb/storage/ene_ub6250.c for the ENE UB6250 reader driver in the Linux     kernel before 6.2.5. An object could potentially extend beyond the end of an allocation. (CVE-2023-45862)

    In the Linux kernel, the following vulnerability has been resolved:

    aio: fix mremap after fork null-deref (CVE-2023-52646)

    In the Linux kernel, the following vulnerability has been resolved:

    net/usb: kalmia: Don't pass act_len in usb_bulk_msg error path (CVE-2023-52703)

    In the Linux kernel, the following vulnerability has been resolved:

    nilfs2: fix underflow in second superblock position calculations (CVE-2023-52705)

    In the Linux kernel, the following vulnerability has been resolved:

    mmc: sdio: fix possible resource leaks in some error paths (CVE-2023-52730)

    In the Linux kernel, the following vulnerability has been resolved:

    net: USB: Fix wrong-direction WARNING in plusb.c (CVE-2023-52742)

    In the Linux kernel, the following vulnerability has been resolved:

    mm/swapfile: add cond_resched() in get_swap_pages() (CVE-2023-52932)

    In the Linux kernel, the following vulnerability has been resolved:

    Squashfs: fix handling and sanity checking of xattr_ids count (CVE-2023-52933)

    In the Linux kernel, the following vulnerability has been resolved:

    scsi: iscsi_tcp: Fix UAF during login when accessing the shost ipaddress (CVE-2023-52974)

    In the Linux kernel, the following vulnerability has been resolved:

    net: openvswitch: fix flow memory leak in ovs_flow_cmd_new (CVE-2023-52977)

    In the Linux kernel, the following vulnerability has been resolved:

    squashfs: harden sanity check in squashfs_read_xattr_id_table (CVE-2023-52979)

    kernel: refcount leak in ctnetlink_create_conntrack() (CVE-2023-7192)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of kernel installed on the remote host is prior to 5.15.102-61.139. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2KERNEL-5.15-2023-015 advisory.

    A regression exists in the Linux Kernel within KVM: nVMX that allowed for speculative execution attacks.
    L2 can carry out Spectre v2 attacks on L1 due to L1 thinking it doesn't need retpolines or IBPB after     running L2 due to KVM (L0) advertising eIBRS support to L1. An attacker at L2 with code execution can     execute code on an indirect branch on the host machine. We recommend upgrading to Kernel 6.2 or past     commit 2e7eab81425a (CVE-2022-2196)

    It has been discovered that on some AMD CPUs, the RAS (Return Address Stack, also called RAP - Return     Address Predictor - in some AMD documentation, and RSB - Return Stack Buffer - in Intel terminology) is     dynamically partitioned between non-idle threads.  This allows an attacker to control speculative     execution on the adjacent thread. (CVE-2022-27672)

    In the Linux kernel, the following vulnerability has been resolved:

    netfilter: nft_tproxy: restrict to prerouting hook (CVE-2022-50001)

    Detected a few exploitable gadgets that could leak secret memory through a side-channel such as MDS as     well as insufficient hardening of the usercopy functions against spectre-v1. (CVE-2023-0458)

    Due to a type confusion during initializations, the tun and tap sockets in the Linux Kernel have their     socket UID hardcoded to 0, i.e. root. While it will be often correct, as TUN/TAP devices require     CAP_NET_ADMIN, it may not always be the case. The socket UID may be used for network filtering and     routing, thus TUN/TAP sockets may be incorrectly managed, potentially bypassing network filters based on     UID. (CVE-2023-1076)

    kernel: Type confusion in pick_next_rt_entity(), which can result in memory corruption. (CVE-2023-1077)

    The upstream bug report describes this issue as follows:

    A flaw found in the Linux Kernel in RDS (Reliable Datagram Sockets) protocol. The     rds_rm_zerocopy_callback() uses list_entry() on the head of a list causing a type confusion. Local user     can trigger this with rds_message_put(). Type confusion leads to `struct rds_msg_zcopy_info *info`     actually points to something else that is potentially controlled by local user. It is known how to trigger     this, which causes an OOB access, and a lock corruption. (CVE-2023-1078)

    Use After Free vulnerability in Linux kernel traffic control index filter (tcindex) allows Privilege     Escalation. The imperfect hash area can be updated while packets are traversing, which will cause a use-     after-free when 'tcf_exts_exec()' is called with the destroyed tcf_ext. A local attacker user can use this     vulnerability to elevate its privileges to root.This issue affects Linux Kernel: from 4.14 before git     commit ee059170b1f7e94e55fa6cadee544e176a6e59c2. (CVE-2023-1281)

    A use-after-free vulnerability in the Linux Kernel traffic control index filter (tcindex) can be exploited     to achieve local privilege escalation. The tcindex_delete function which does not properly deactivate     filters in case of a perfect hashes while deleting the underlying structure which can later lead to double     freeing the structure. A local attacker user can use this vulnerability to elevate its privileges to     root.We recommend upgrading past commit 8c710f75256bb3cf05ac7b1672c82b92c43f3d28. (CVE-2023-1829)

    A use-after-free vulnerability in the Linux Kernel io_uring system can be exploited to achieve local     privilege escalation.

    The io_file_get_fixed function lacks the presence of ctx->uring_lock which can lead to a Use-After-Free     vulnerability due a race condition with fixed files getting unregistered.

    We recommend upgrading past commit da24142b1ef9fd5d36b76e36bab328a5b27523e8. (CVE-2023-1872)

    When plain IBRS is enabled (not enhanced IBRS), the logic in spectre_v2_user_select_mitigation()     determines that STIBP is not needed. The IBRS bit implicitly protects against cross-thread branch     targetinjection. However, with legacy IBRS, the IBRS bit is cleared on returning to userspace for     performance reasons which leaves userspace threads vulnerable to cross-thread branch target injection     against which STIBP protects. (CVE-2023-1998)

    In the Linux kernel before 6.1.13, there is a double free in net/mpls/af_mpls.c upon an allocation failure     (for registering the sysctl table under a new location) during the renaming of a device. (CVE-2023-26545)

    A use-after-free flaw was found in hfsplus_put_super in fs/hfsplus/super.c in the Linux Kernel. This flaw     could allow a local user to cause a denial of service. (CVE-2023-2985)

    An issue was discovered in lib/kobject.c in the Linux kernel before 6.2.3. With root access, an attacker     can trigger a race condition that results in a fill_kobj_path out-of-bounds write. (CVE-2023-45863)

    In the Linux kernel, the following vulnerability has been resolved:

    aio: fix mremap after fork null-deref (CVE-2023-52646)

    In the Linux kernel, the following vulnerability has been resolved:

    net: openvswitch: fix possible memory leak in ovs_meter_cmd_set() (CVE-2023-52702)

    In the Linux kernel, the following vulnerability has been resolved:

    sched/psi: Fix use-after-free in ep_remove_wait_queue() (CVE-2023-52707)

    In the Linux kernel, the following vulnerability has been resolved:

    bpf, sockmap: Don't let sock_map_{close,destroy,unhash} call itself (CVE-2023-52735)

    In the Linux kernel, the following vulnerability has been resolved:

    Fix page corruption caused by racy check in __free_pages (CVE-2023-52739)

    In the Linux kernel, the following vulnerability has been resolved:

    cifs: Fix use-after-free in rdata->read_into_pages() (CVE-2023-52741)

    In the Linux kernel, the following vulnerability has been resolved:

    xfrm/compat: prevent potential spectre v1 gadget in xfrm_xlate32_attr() (CVE-2023-52746)

    kernel: refcount leak in ctnetlink_create_conntrack() (CVE-2023-7192)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

遠端 Ubuntu 22.04 LTS 主機上安裝的一個套件受到 USN-6171-1 公告中所提及的多個弱點影響。

  - 在 Linux 核心流量控制 (TC) 子系統中發現一個缺陷。使用特定的網路組態 (使用 TC 動作鏡像將輸出封包重新導向至輸入)，當使用中的傳輸通訊協定 (TCP 或 SCTP) 重新傳輸時，無權限的本機使用者可觸發 CPU 軟鎖定 (ABBA 鎖死)，進而導致拒絕服務條件。(CVE-2022-4269)

  - 在 Linux 核心中發現一個缺陷。由於初始化函式中的類型混淆，tun/tap 通訊端將其通訊端 UID 硬式編碼為 0。雖然這通常是正確的，因為 tuntap 裝置需要 CAP_NET_ADMIN，但也存在例外情況，例如，非 root 使用者只有該功能。這會使 tun/tap 通訊端在篩選/路由決策中遭到錯誤處理，進而可能繞過網路篩選器。(CVE-2023-1076)

  - 在 Linux 核心中，因為混淆的項目不是 NULL，而是 list_head，所以 pick_next_rt_entity() 可能傳回 BUG_ON 條件未偵測到的類型混淆項目。存在問題的錯誤條件會導致類型混淆項目包含清單標頭，而它之後又被用作類型混淆的 sched_rt_entity，進而造成記憶體損毀。(CVE-2023-1077)

  - 在 Linux 核心中發現一個缺陷。插入/中斷惡意 USB 裝置 (其宣稱自己為 Asus 裝置) 時，可能會在 asus_kbd_backlight_set 中觸發釋放後使用漏洞。此問題與之前已知的 CVE-2023-25012 類似，但在 asus 裝置中，work_struct 可能會在裝置中斷連線時由 LED 控制器排程，進而在結構 asus_kbd_leds *led 結構上觸發釋放後使用漏洞。惡意 USB 裝置可能會惡意利用此問題，造成受控制資料的記憶體損毀。
    (CVE-2023-1079)

  - 在 Linux 核心 Xircom 16 位元 PCMCIA (PC 卡) 乙太網路驅動程式中發現一個釋放後使用缺陷。本機使用者可利用此缺陷來使系統當機，或可能提升其在系統上的權限。
    (CVE-2023-1670)

  - 在 Linux 核心中，9pfs 的 Xen 傳輸中 net/9p/trans_xen.c 的 xen_9pfs_front_removet 中存在釋放後使用缺陷。本機攻擊者可利用此缺陷造成爭用問題，進而導致系統當機，或造成核心資訊洩漏。(CVE-2023-1859)

  - Linux 核心允許使用者空間處理程序透過呼叫 prctl (PR_SET_SPECULATION_CTRL 已停用推測功能)，以及使用 seccomp 來啟用緩解措施。我們發現，在至少一個主要雲端供應商的 VM 上，即使在使用 prctl 啟用 spectre-BTI 緩解措施之後，核心在某些情況下仍會讓受害者處理程序容易受到攻擊。在開機命令行強制執行 IBRS 緩解措施時，可在裸機上觀察到相同的行為。發生這種情況是因為在啟用純 IBRS (非增強型 IBRS) 的情況下，核心的某些邏輯會判斷為不需要 STIBP。IBRS 位元可暗中防止跨執行緒分支目標插入。
    但是，使用舊版 IBRS 時，由於效能原因，IBRS 位元會在傳回至使用者空間時遭到清除，這會停用隱含的 STIBP，並使使用者空間執行緒容易受到 STIBP 防範的跨執行緒分支目標插入弱點影響。(CVE-2023-1998)

  - 在 Linux 核心 6.1.9 及更低版本中，由於 LED 控制器保持註冊的時間過長，透過特製的 USB 裝置在 drivers/hid/hid-bigbenff.c 的 bigben_remove 中存在釋放後使用漏。(CVE-2023-25012)

  - 在 Linux 核心中 fs/hfsplus/super.c 的 hfsplus_put_super 中發現釋放後使用缺陷。本機使用者可利用此缺陷造成拒絕服務。(CVE-2023-2985)

請注意，Nessus 並未測試這些問題，而是僅依據應用程式自我報告的版本號碼作出判斷。

Linux/Unix 主機上安裝了一個或多個受到弱點影響的套件，且供應商未提供可用的修補程式。

  - 在 Linux 核心中 fs/hfsplus/super.c 的 hfsplus_put_super 中發現釋放後使用缺陷。本機使用者可利用此缺陷造成拒絕服務。(CVE-2023-2985)

請注意，Nessus 依賴供應商報告的套件存在。

遠端 Ubuntu 16.04 ESM/18.04 ESM 主機上安裝的套件受到 USN-6342-2 公告中提及的多個弱點影響。

  - Zen 2 CPU 中有一個問題，在特定微架構情況下，可能允許攻擊者存取敏感資訊。(CVE-2023-20593)

  - 由於可能的遞迴鎖定狀況，導致出現拒絕服務問題，其可造成 Linux Kernel Device Mapper-Multipathing 子元件的 drivers/md/dm-ioctl.c 中的 table_clear 發生鎖死。(CVE-2023-2269)

  - 在 Linux 核心中 fs/hfsplus/super.c 的 hfsplus_put_super 中發現釋放後使用缺陷。本機使用者可利用此缺陷造成拒絕服務。(CVE-2023-2985)

  - 在 Linux 核心 6.2 版的 drivers/media/dvb-core/dvb_frontend.c 中發現一個問題。當工作處於 !TASK_RUNNING 中時，存在一個封鎖作業。在 dvb_frontend_get_event 中，呼叫了 wait_event_interruptible；條件為 dvb_frontend_test_event(fepriv,events)。在 dvb_frontend_test_event 中，呼叫了 down(&fepriv->sem)。但是，wait_event_interruptible 會使處理程序進入睡眠狀態，而 down(&fepriv->sem) 可能會封鎖該處理程序。(CVE-2023-31084)

  - Linux 核心的 net/sched: sch_qfq 元件中存在釋放後使用弱點，攻擊者可利用此弱點達到本機權限提升的目的。net/sched/sch_qfq.c 中的 qfq_change_agg() 函式允許超出邊界寫入，這是因為 lmax 是根據封包大小更新並且沒有進行邊界檢查。建議升級過去的 Commit 3e337087c3b5805fe0b8a46ba622a962880b5d64。(CVE-2023-3611)

  - Linux 核心的 net/sched: cls_fw 元件中存在釋放後使用弱點，攻擊者可利用此弱點達到本機權限提升的目的。如果 tcf_change_indev() 失敗，fw_set_parms() 會在增加或減少 tcf_bind_filter() 中的參照計數器後立即傳回錯誤。如果攻擊者可控制參照計數器並將其設定為零，便可造成參照釋放，進而導致釋放後使用弱點。建議升級過去的 Commit 0323bce598eea038714f941ce2b22541c46d488f。
    (CVE-2023-3776)

請注意，Nessus 並未測試這些問題，而是僅依據應用程式自我報告的版本號碼作出判斷。

遠端主機上安裝的核心版本早於 4.14.309-231.529。因此，會受到 ALAS2-2023-1987 公告中所提及的多個弱點影響。

    偵測到一些可遭惡意利用的小工具，這些小工具可透過側通道 (如 MDS) 以及針對 spectre-v1 的 usercopy 函式強化不足，來洩漏私密記憶體。(CVE-2023-0458)

    Linux 核心流量控制索引篩選器 (tcindex) 中的釋放後使用弱點可觸發特權提升攻擊。不完整的雜湊區域可在封包遊走時更新，這將在使用損毀的 tcf_ext 呼叫「tcf_exts_exec()」時造成釋放後使用。本機攻擊者可利用此弱點將特權提升為根權限。此問題會影響 Linux 核心：從 4.14 開始的版本，直至 git 認可 ee059170b1f7e94e55fa6cadee544e176a6e59c2 之前。(CVE-2023-1281)

    Linux 核心流量控制索引篩選器 (tcindex) 中的釋放後使用弱點可被利用來提升本機權限。tcindex_delete 函式在刪除基礎結構時未正確停用篩選器，從而會在稍後導致重複釋放該結構。本機攻擊者可利用此弱點來將特權提升為根權限。我們建議使用者升級過去的認可 8c710f75256bb3cf05ac7b1672c82b92c43f3d28。(CVE-2023-1829)

    啟用純文字 IBRS (非增強型 IBRS) 時，spectre_v2_user_select_mitigation() 中的邏輯會判定不需要 STIBP。IBRS 位元可暗中防止跨執行緒分支目標插入。但是，使用舊版 IBRS 時，由於效能原因，IBRS 位元會在傳回至使用者空間時遭到清除，這會使使用者空間執行緒容易受到 STIBP 防範的跨執行緒分支目標插入攻擊。(CVE-2023-1998)

    在 Linux 核心的 SCSI 子元件中，發現 drivers/scsi/iscsi_tcp.c 的 iscsi_sw_tcp_session_create 存在釋放後使用瑕疵。此問題允許攻擊者洩漏核心內部資訊。
    (CVE-2023-2162)

    - 在低於 6.1.13 版的 Linux 核心中，重新命名裝置期間發生配置失敗 (用於在新位置下登記 sysctl 表格) 後，net/mpls/af_mpls.c 中會發生雙重釋放。(CVE-2023-26545)

    在 Linux 核心中 fs/hfsplus/super.c 的 hfsplus_put_super 中發現釋放後使用缺陷。本機使用者可利用此缺陷造成拒絕服務。(CVE-2023-2985)

    在 Linux 核心的 Framebuffer Console (fbcon) 中發現一個缺陷。為 fbcon_set_font 提供大於 32 的 font->width 和 font->height 時，由於沒有適當的檢查，會發生移位超出邊界，進而導致未定義的行為且可能造成拒絕服務。(CVE-2023-3161)

    在 6.2.5 之前版本的 Linux 核心中，發現 ENE UB6250 讀取器驅動程式中的 drivers/usb/storage/ene_ub6250.c 存在問題。物件的延伸範圍可能超出配置的結尾。(CVE-2023-45862)

    在 Linux 核心中，下列弱點已解決：

    aio：修復分支解除參照 Null 指標後的 mremap (CVE-2023-52646)

    在 Linux 核心中，下列弱點已解決：

    net/usb：kalmia：不要在 usb_bulk_msg 錯誤路徑中傳遞 act_len (CVE-2023-52703)

    在 Linux 核心中，下列弱點已解決：

    nilfs2 : 修復第二個超級區塊位置計算中的反向溢位 (CVE-2023-52705)

    在 Linux 核心中，下列弱點已解決：

    mmc: sdio: 修復某些錯誤路徑中潛在的資源洩漏問題 (CVE-2023-52730)

    在 Linux 核心中，下列弱點已解決：

    net: USB: 修復 plusb.c 中方向錯誤的警告 (CVE-2023-52742)

    在 Linux 核心中，下列弱點已解決：

    mm/swapfile: 在 get_swap_pages() 中新增 cond_resched() (CVE-2023-52932)

    在 Linux 核心中，下列弱點已解決：

    Squashfs: 修復 xattr_ids 數量處理和功能健全檢查的錯誤 (CVE-2023-52933)

    在 Linux 核心中，下列弱點已解決：

    scsi: iscsi_tcp : 修復存取 shost ipaddress 時在登入期間發生 UAF (CVE-2023-52974)

    在 Linux 核心中，下列弱點已解決：

    net: openvswitch: 修復 ovs_flow_cmd_new 中的流程記憶體流失 (CVE-2023-52977)

    在 Linux 核心中，下列弱點已解決：

    squashfs: 強化 squashfs_read_xattr_id_table 中的功能健全檢查 (CVE-2023-52979)

    核心：ctnetlink_create_conntrack() 中的參照計數洩漏問題 (CVE-2023-7192)

Tenable 已直接從所測試產品的安全公告擷取前置描述區塊。

請注意，Nessus 並未測試這些問題，而是僅依據應用程式自我報告的版本號碼作出判斷。

遠端主機上安裝的核心版本早於 5.15.102-61.139。因此，會受到 ALAS2KERNEL-5.15-2023-015 公告中所提及的多個弱點影響。

    Linux 核心的 KVM: nVMX 中存在迴歸問題，會引起推測執行攻擊。
    因為 KVM (L0) 向 L1 通告 eIBRS 支援，L1 認為在執行 L2 後其不需要 retpolines 或 IBPB，所以 L2 可以對 L1 發動 Spectre v2 攻擊。在 L2 具有程式碼執行權限的攻擊者可在主機的間接分支上執行程式碼。建議升級爲 Kernel 6.2 或之前的 commit 2e7eab81425a (CVE-2022-2196)

    據發現，在某些 AMD CPU 上，RAS (在某些 AMD 文件中亦稱為 RAP - Return Address Predictor，在 Intel 術語中稱為 RSB - Return Stack Buffer) 會在非閒置執行緒之間動態分割。這可讓攻擊者控制相鄰執行緒上的推測執行。(CVE-2022-27672)

    在 Linux 核心中，下列弱點已解決：

    netfilternft_tproxy限制為 prerouting 勾點 (CVE-2022-50001)

    偵測到一些可遭惡意利用的小工具，這些小工具可透過側通道 (如 MDS) 以及針對 spectre-v1 的 usercopy 函式強化不足，來洩漏私密記憶體。(CVE-2023-0458)

    由於初始化期間的類型混淆問題，Linux 核心中的 tun 和 tap 通訊端將其通訊端 UID 硬式編碼為 0 (即 root)。雖然這通常是正確的，因為 TUN/TAP 裝置需要 CAP_NET_ADMIN，但也存在例外情況。通訊端 UID 可用於網路篩选和路由，因此可能導致 TUN/TAP 通訊端管理方式錯誤，進而可能繞過以 UID 為基礎的網路篩選器。(CVE-2023-1076)

    核心：pick_next_rt_entity() 中存在類型混淆弱點，此弱點可導致記憶體損毀。(CVE-2023-1077)

    上游錯誤報告對此問題的描述如下：

    在 Linux 核心的可靠資料包通訊端 (RDS) 通訊協定實作中發現一個瑕疵。rds_rm_zerocopy_callback() 在清單標頭上使用 list_entry()，可造成類型混淆。本機使用者可透過 rds_message_put() 觸發此問題。類型混淆導致 `struct rds_zcopy_info *info` 實際上指向可能由本機使用者控制的其他內容。目前已知此問題的觸發方式，觸發後可造成超出邊界存取和鎖定損毀。(CVE-2023-1078)

    Linux 核心流量控制索引篩選器 (tcindex) 中的釋放後使用弱點可觸發特權提升攻擊。不完整的雜湊區域可在封包遊走時更新，這將在使用損毀的 tcf_ext 呼叫「tcf_exts_exec()」時造成釋放後使用。本機攻擊者可利用此弱點將特權提升為根權限。此問題會影響 Linux 核心：從 4.14 開始的版本，直至 git 認可 ee059170b1f7e94e55fa6cadee544e176a6e59c2 之前。(CVE-2023-1281)

    Linux 核心流量控制索引篩選器 (tcindex) 中的釋放後使用弱點可被利用來提升本機權限。tcindex_delete 函式在刪除基礎結構時未正確停用篩選器，從而會在稍後導致重複釋放該結構。本機攻擊者可利用此弱點來將特權提升為根權限。我們建議使用者升級過去的認可 8c710f75256bb3cf05ac7b1672c82b92c43f3d28。(CVE-2023-1829)

    Linux 核心 io_uring 系統中包含釋放後使用弱點，攻擊者可藉此來提升本機權限。

    io_file_get_fixed 函式缺少 ctx->uring_lock，這可能會因修正檔案取消註冊的爭用情形而導致釋放後使用弱點。

    我們建議升級為之前的 commit da24142b1ef9fd5d36b76e36bab328a5b27523e8。(CVE-2023-1872)

    啟用純文字 IBRS (非增強型 IBRS) 時，spectre_v2_user_select_mitigation() 中的邏輯會判定不需要 STIBP。IBRS 位元可暗中防止跨執行緒分支目標插入。但是，使用舊版 IBRS 時，由於效能原因，IBRS 位元會在傳回至使用者空間時遭到清除，這會使使用者空間執行緒容易受到 STIBP 防範的跨執行緒分支目標插入攻擊。(CVE-2023-1998)

    - 在低於 6.1.13 版的 Linux 核心中，重新命名裝置期間發生配置失敗 (用於在新位置下登記 sysctl 表格) 後，net/mpls/af_mpls.c 中會發生雙重釋放。(CVE-2023-26545)

    在 Linux 核心中 fs/hfsplus/super.c 的 hfsplus_put_super 中發現釋放後使用缺陷。本機使用者可利用此缺陷造成拒絕服務。(CVE-2023-2985)

    在 6.2.3 版之前的 Linux 核心中，發現 lib/kobject.c 存在問題。攻擊者可藉由 root 存取權觸發爭用情形，進而導致 fill_kobj_path 超出邊界寫入。(CVE-2023-45863)

    在 Linux 核心中，下列弱點已解決：

    aio：修復分支解除參照 Null 指標後的 mremap (CVE-2023-52646)

    在 Linux 核心中，下列弱點已解決：

    netopenvswitch修正 ovs_meter_cmd_set() 中的潛在記憶體洩漏 (CVE-2023-52702)

    在 Linux 核心中，下列弱點已解決：

    sched/psi：修正 ep_remove_wait_queue() 中的釋放後使用弱點 (CVE-2023-52707)

    在 Linux 核心中，下列弱點已解決：

    bpf, sockmap：不讓 sock_map_{close,destroy,unhash} 自行呼叫 (CVE-2023-52735)

    在 Linux 核心中，下列弱點已解決：

    修正 __free_pages 中的 racy 檢查所造成的頁面損毀 (CVE-2023-52739)

    在 Linux 核心中，下列弱點已解決：

    cifs：修正 rdata->read_into_pages() 中的釋放後使用 (CVE-2023-52741)

    在 Linux 核心中，下列弱點已解決：

    xfrm/compat：阻止 xfrm_xlate32_attr() 中潛在的 spectre v1 小工具 (CVE-2023-52746)

    核心：ctnetlink_create_conntrack() 中的參照計數洩漏問題 (CVE-2023-7192)

Tenable 已直接從所測試產品的安全公告擷取前置描述區塊。

請注意，Nessus 並未測試這些問題，而是僅依據應用程式自我報告的版本號碼作出判斷。

遠端 Ubuntu 16.04 ESM 主機上安裝的一個套件受到 USN-6309-1 公告中提及的多個弱點影響。

  - 由於可能的遞迴鎖定狀況，導致出現拒絕服務問題，其可造成 Linux Kernel Device Mapper-Multipathing 子元件的 drivers/md/dm-ioctl.c 中的 table_clear 發生鎖死。(CVE-2023-2269)

  - 在 Linux 核心中 fs/hfsplus/super.c 的 hfsplus_put_super 中發現釋放後使用缺陷。本機使用者可利用此缺陷造成拒絕服務。(CVE-2023-2985)

  - 在 Linux 核心 6.2 版的 drivers/media/dvb-core/dvb_frontend.c 中發現一個問題。當工作處於 !TASK_RUNNING 中時，存在一個封鎖作業。在 dvb_frontend_get_event 中，呼叫了 wait_event_interruptible；條件為 dvb_frontend_test_event(fepriv,events)。在 dvb_frontend_test_event 中，呼叫了 down(&fepriv->sem)。但是，wait_event_interruptible 會使處理程序進入睡眠狀態，而 down(&fepriv->sem) 可能會封鎖該處理程序。(CVE-2023-31084)

  - 在 Linux 核心的 vc_screen 中，發現 drivers/tty/vt/vc_screen.c 的 vcs_read 中存在釋放後使用瑕疵。此問題允許具有本機使用者存取權的攻擊者造成系統當機或洩漏核心內部資訊。(CVE-2023-3567)

  - Linux 核心的 net/sched: sch_qfq 元件中存在釋放後使用弱點，攻擊者可利用此弱點達到本機權限提升的目的。net/sched/sch_qfq.c 中的 qfq_change_agg() 函式允許超出邊界寫入，這是因為 lmax 是根據封包大小更新並且沒有進行邊界檢查。建議升級過去的 Commit 3e337087c3b5805fe0b8a46ba622a962880b5d64。(CVE-2023-3611)

  - Linux 核心的 net/sched: cls_fw 元件中存在釋放後使用弱點，攻擊者可利用此弱點達到本機權限提升的目的。如果 tcf_change_indev() 失敗，fw_set_parms() 會在增加或減少 tcf_bind_filter() 中的參照計數器後立即傳回錯誤。如果攻擊者可控制參照計數器並將其設定為零，便可造成參照釋放，進而導致釋放後使用弱點。建議升級過去的 Commit 0323bce598eea038714f941ce2b22541c46d488f。
    (CVE-2023-3776)

請注意，Nessus 並未測試這些問題，而是僅依據應用程式自我報告的版本號碼作出判斷。

遠端 Ubuntu 16.04 ESM/18.04 ESM 主機上安裝的套件受到 USN-6342-1 公告中提及的多個弱點影響。

  - Zen 2 CPU 中有一個問題，在特定微架構情況下，可能允許攻擊者存取敏感資訊。(CVE-2023-20593)

  - 由於可能的遞迴鎖定狀況，導致出現拒絕服務問題，其可造成 Linux Kernel Device Mapper-Multipathing 子元件的 drivers/md/dm-ioctl.c 中的 table_clear 發生鎖死。(CVE-2023-2269)

  - 在 Linux 核心中 fs/hfsplus/super.c 的 hfsplus_put_super 中發現釋放後使用缺陷。本機使用者可利用此缺陷造成拒絕服務。(CVE-2023-2985)

  - 在 Linux 核心 6.2 版的 drivers/media/dvb-core/dvb_frontend.c 中發現一個問題。當工作處於 !TASK_RUNNING 中時，存在一個封鎖作業。在 dvb_frontend_get_event 中，呼叫了 wait_event_interruptible；條件為 dvb_frontend_test_event(fepriv,events)。在 dvb_frontend_test_event 中，呼叫了 down(&fepriv->sem)。但是，wait_event_interruptible 會使處理程序進入睡眠狀態，而 down(&fepriv->sem) 可能會封鎖該處理程序。(CVE-2023-31084)

  - Linux 核心的 net/sched: sch_qfq 元件中存在釋放後使用弱點，攻擊者可利用此弱點達到本機權限提升的目的。net/sched/sch_qfq.c 中的 qfq_change_agg() 函式允許超出邊界寫入，這是因為 lmax 是根據封包大小更新並且沒有進行邊界檢查。建議升級過去的 Commit 3e337087c3b5805fe0b8a46ba622a962880b5d64。(CVE-2023-3611)

  - Linux 核心的 net/sched: cls_fw 元件中存在釋放後使用弱點，攻擊者可利用此弱點達到本機權限提升的目的。如果 tcf_change_indev() 失敗，fw_set_parms() 會在增加或減少 tcf_bind_filter() 中的參照計數器後立即傳回錯誤。如果攻擊者可控制參照計數器並將其設定為零，便可造成參照釋放，進而導致釋放後使用弱點。建議升級過去的 Commit 0323bce598eea038714f941ce2b22541c46d488f。
    (CVE-2023-3776)

請注意，Nessus 並未測試這些問題，而是僅依據應用程式自我報告的版本號碼作出判斷。

ID	名稱	產品	系列	已發布	已更新	嚴重性
245770	Linux Distros Unpatched Vulnerability : CVE-2023-2985	Nessus	Misc.	2025/8/8	2025/9/2	medium
181186	Ubuntu 16.04 ESM / 18.04 ESM : Linux kernel (Azure) vulnerabilities (USN-6342-2)	Nessus	Ubuntu Local Security Checks	2023/9/8	2024/9/18	critical
179914	SUSE SLES12 Security Update : kernel (SUSE-SU-2023:3324-1)	Nessus	SuSE Local Security Checks	2023/8/17	2025/3/31	critical
180224	Ubuntu 16.04 ESM : Linux kernel vulnerabilities (USN-6309-1)	Nessus	Ubuntu Local Security Checks	2023/8/28	2024/9/19	critical
180532	Ubuntu 16.04 ESM / 18.04 ESM : Linux kernel vulnerabilities (USN-6342-1)	Nessus	Ubuntu Local Security Checks	2023/9/6	2024/9/18	critical
173233	Amazon Linux 2 : kernel (ALAS-2023-1987)	Nessus	Amazon Linux Local Security Checks	2023/3/22	2025/5/22	high
173235	Amazon Linux 2 : kernel (ALASKERNEL-5.15-2023-015)	Nessus	Amazon Linux Local Security Checks	2023/3/22	2025/8/5	high
236373	Alibaba Cloud Linux 3 : 0136: cloud-kernel bugfix, enhancement and (ALINUX3-SA-2023:0136)	Nessus	Alibaba Cloud Linux Local Security Checks	2025/5/14	2025/5/14	critical
183564	Ubuntu 22.04 LTS：Linux 核心弱點 (USN-6171-1)	Nessus	Ubuntu Local Security Checks	2023/10/20	2024/8/27	high
245770	Linux Distros 未修補的弱點：CVE-2023-2985	Nessus	Misc.	2025/8/8	2025/9/2	medium
181186	Ubuntu 16.04 ESM / 18.04 ESM：Linux 核心 (Azure) 弱點 (USN-6342-2)	Nessus	Ubuntu Local Security Checks	2023/9/8	2024/9/18	critical
173233	Amazon Linux 2：核心 (ALAS-2023-1987)	Nessus	Amazon Linux Local Security Checks	2023/3/22	2025/5/22	high
173235	Amazon Linux 2：kernel (ALASKERNEL-5.15-2023-015)	Nessus	Amazon Linux Local Security Checks	2023/3/22	2025/8/5	high
180224	Ubuntu 16.04 ESM：Linux 核心弱點 (USN-6309-1)	Nessus	Ubuntu Local Security Checks	2023/8/28	2024/9/19	critical
180532	Ubuntu 16.04 ESM / 18.04 ESM：Linux 核心弱點 (USN-6342-1)	Nessus	Ubuntu Local Security Checks	2023/9/6	2024/9/18	critical

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