CentOS Linux 8.5 [TuxCare] 安全性更新：kernel-cross-headers / kernel-debug-modules-extra / etc 多個弱點 （CENTOS8.5：CLSA-2025：1749562017）
high Nessus Plugin ID 352664
語言:
概要
CentOS Linux 主機缺少一個或多個安全性更新。說明
CentOS Linux 8.5 主機安裝的套件會受到 TuxCare CENTOS8.5：CLSA-2025：1749562017 公告中提及的多個弱點影響。- 已解決 Linux 核心中的下列弱點：mm/khugepaged: invoke MMU notifiers in shmem/file collapse paths Any codepath that zaps page table entries must invoke MMU notifiers to ensure that secondary MMUs (like KVM) don't keep accessing pages which aren't mapped anymore. Secondary MMUs don't hold their own references to pages that are mirrored over, so failing to notify them can lead to page use-after-free. I'm marking this as addressing an issue introduced in commit f3f0e1d2150b (khugepaged: add support of collapse for tmpfs/shmem pages), but most of the security impact of this only came in commit 27e1f8273113 (khugepaged: enable collapse pmd for pte-mapped THP), which actually omitted flushes for the removal of present PTEs, not just for the removal of empty page tables.
(CVE-2022-48991)
- 已解決 Linux 核心中的下列弱點：mac80211: fix potential double free on mesh join While commit 6a01afcf8468 (mac80211: mesh: Free ie data when leaving mesh) fixed a memory leak on mesh leave / teardown it introduced a potential memory corruption caused by a double free when rejoining the mesh: ieee80211_leave_mesh() -> kfree(sdata->u.mesh.ie); ... ieee80211_join_mesh() -> copy_mesh_setup() -> old_ie = ifmsh->ie; -> kfree(old_ie); This double free / kernel panics can be reproduced by using wpa_supplicant with an encrypted mesh (if set up without encryption via iw then ifmsh->ie is always NULL, which avoids this issue). And then calling: $ iw dev mesh0 mesh leave $ iw dev mesh0 mesh join my-mesh Note that typically these commands are not used / working when using wpa_supplicant. And it seems that wpa_supplicant or wpa_cli are going through a NETDEV_DOWN/NETDEV_UP cycle between a mesh leave and mesh join where the NETDEV_UP resets the mesh.ie to NULL via a memcpy of default_mesh_setup in cfg80211_netdev_notifier_call, which then avoids the memory corruption, too. The issue was first observed in an application which was not using wpa_supplicant but Senf instead, which implements its own calls to nl80211. Fixing the issue by removing the kfree()'ing of the mesh IE in the mesh join function and leaving it solely up to the mesh leave to free the mesh IE. (CVE-2022-49290)
- 已解決 Linux 核心中的下列弱點：tracing: Fix potential double free in create_var_ref() In create_var_ref(), init_var_ref() is called to initialize the fields of variable ref_field, which is allocated in the previous function call to create_hist_field(). Function init_var_ref() allocates the corresponding fields such as ref_field->system, but frees these fields when the function encounters an error. The caller later calls destroy_hist_field() to conduct error handling, which frees the fields and the variable itself. This results in double free of the fields which are already freed in the previous function. Fix this by storing NULL to the corresponding fields when they are freed in init_var_ref(). (CVE-2022-49410)
- 已解決 Linux 核心中的下列弱點：wifi: mac80211: fix use-after-free in chanctx code In ieee80211_vif_use_reserved_context(), when we have an old context and the new context's replace_state is set to IEEE80211_CHANCTX_REPLACE_NONE, we free the old context in ieee80211_vif_use_reserved_reassign(). Therefore, we cannot check the old_ctx anymore, so we should set it to NULL after this point. However, since the new_ctx replace state is clearly not IEEE80211_CHANCTX_REPLACES_OTHER, we're not going to do anything else in this function and can just return to avoid accessing the freed old_ctx. (CVE-2022-49416)
- 已解決 Linux 核心中的下列弱點：media: pvrusb2: fix array-index-out-of-bounds in pvr2_i2c_core_init Syzbot reported that -1 is used as array index. The problem was in missing validation check. hdw->unit_number is initialized with -1 and then if init table walk fails this value remains unchanged. Since code blindly uses this member for array indexing adding sanity check is the easiest fix for that. hdw->workpoll initialization moved upper to prevent warning in __flush_work.
(CVE-2022-49478)
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。
解決方案
根據 TuxCare 公告 CENTOS8.5：CLSA-2025：1749562017 中的指引更新受影響的套件。另請參閱
Plugin 詳細資訊
嚴重性: High
ID: 352664
檔案名稱: tuxcare_centos_8.5_CLSA-2025-1749562017.nasl
版本: 1.1
類型: Local
代理程式: unix
已發布: 2026/9/30
已更新: 2026/9/30
支援的感應器: Continuous Assessment, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus
風險資訊
VPR
風險因素: High
分數: 7.6
百分位數: 98.67
Vendor
Vendor Severity: Important
CVSS v2
風險因素: Medium
基本分數: 6.8
時間性分數: 5.3
媒介: CVSS2#AV:L/AC:L/Au:S/C:C/I:C/A:C
CVSS 評分資料來源: CVE-2025-21780
CVSS v3
風險因素: High
基本分數: 7.8
時間性分數: 7
媒介: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
時間媒介: CVSS:3.0/E:P/RL:O/RC:C
弱點資訊
必要的 KB 項目: Host/OS/extended-third-party, Host/local_checks_enabled, Host/CentOS/release, Host/CentOS/rpm-list
可被惡意程式利用: true
可輕鬆利用: Exploits are available
修補程式發佈日期: 2025/6/10
弱點發布日期: 2021/7/21
參考資訊
CVE: CVE-2022-48991, CVE-2022-49290, CVE-2022-49410, CVE-2022-49416, CVE-2022-49478, CVE-2022-49508, CVE-2022-49530, CVE-2023-52988, CVE-2025-21780, CVE-2025-37785
CLSA: 2025:1749562017