CentOS Linux 8.5 [TuxCare] 安全性更新：bpftool / kernel / kernel-core / kernel-cross-headers / etc 多個弱點 （CENTOS8.5：CLSA-2026：1784274653）
high Nessus Plugin ID 362361
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-2026：1784274653 公告中提及的多個弱點影響。- 已解決 Linux 核心中的下列弱點：macvlan: fix error recovery in macvlan_common_newlink() valis provided a nice repro to crash the kernel: ip link add p1 type veth peer p2 ip link set address 00:00:00:00:00:20 dev p1 ip link set up dev p1 ip link set up dev p2 ip link add mv0 link p2 type macvlan mode source ip link add invalid% link p2 type macvlan mode source macaddr add 00:00:00:00:00:20 ping -c1 -I p1 1.2.3.4 He also gave a very detailed analysis: <quote valis> The issue is triggered when a new macvlan link is created with MACVLAN_MODE_SOURCE mode and MACVLAN_MACADDR_ADD (or MACVLAN_MACADDR_SET) parameter, lower device already has a macvlan port and register_netdevice() called from macvlan_common_newlink() fails (e.g. because of the invalid link name). In this case macvlan_hash_add_source is called from macvlan_change_sources() / macvlan_common_newlink(): This adds a reference to vlan to the port's vlan_source_hash using macvlan_source_entry. vlan is a pointer to the priv data of the link that is being created. When register_netdevice() fails, the error is returned from macvlan_newlink() to rtnl_newlink_create(): if (ops->newlink) err = ops->newlink(dev, ms, extack);
else err = register_netdevice(dev); if (err < 0) { free_netdev(dev); goto out; } and free_netdev() is called, causing a kvfree() on the struct net_device that is still referenced in the source entry attached to the lower device's macvlan port. Now all packets sent on the macvlan port with a matching source mac address will trigger a use-after-free in macvlan_forward_source(). </quote valis> With all that, my fix is to make sure we call macvlan_flush_sources() regardless of @create value whenever goto destroy_macvlan_port; path is taken. Many thanks to valis for following up on this issue.
(CVE-2026-23209)
- 已解決 Linux 核心中的下列弱點：xfs: resample the data fork mapping after cycling ILOCK xfs_reflink_fill_{cow_hole,delalloc} are both presented with an inode, a data fork mapping, and a cow fork mapping. Unfortunately, these two helpers cycle the ILOCK to grab a transaction, which means that the mappings are stale as soon as we reacquire the ILOCK. Currently we refresh the cow fork mapping by re-calling xfs_find_trim_cow_extent, but we don't refresh the data fork mapping beforehand, which means that the xfs_bmap_trim_cow in that function queries the refcount btree about the wrong physical blocks and returns an inaccurate value in *shared. If *shared is now false, the directio write proceeds with a stale data fork mapping. Fix this by querying the data fork mapping if the sequence counter changes across the ILOCK cycle. (CVE-2026-64600)
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-2026：1784274653 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: 362361
檔案名稱: tuxcare_centos_8.5_CLSA-2026-1784274653.nasl
版本: 1.2
類型: Local
代理程式: unix
已發布: 2026/10/1
已更新: 2026/10/18
支援的感應器: Nessus Agent, Continuous Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus
風險資訊
VPR
風險因素: High
分數: 7.9
百分位數: 99.32
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-2026-23209
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/local_checks_enabled, Host/CentOS/release, Host/CentOS/rpm-list, Host/OS/extended-third-party
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: 2026/7/17
弱點發布日期: 2026/2/14
參考資訊
CVE: CVE-2026-23209, CVE-2026-64600
CLSA: 2026:1784274653