CentOS Linux 8.5 [TuxCare] 安全性更新：bpftool / kernel / kernel-core / kernel-cross-headers / etc （CENTOS8.5：CLSA-2026：1778261157）
high Nessus Plugin ID 352379
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 主機已安裝的套件會受到 TuxCare CENTOS8.5：CLSA-2026：1778261157 公告中所述弱點影響。- 已解決 Linux 核心中的下列弱點：xfrm: esp: avoid in-place decrypt on shared skb frags MSG_SPLICE_PAGES can attach pages from a pipe directly to an skb. TCP marks such skbs with SKBFL_SHARED_FRAG after skb_splice_from_iter(), so later paths that may modify packet data can first make a private copy. The IPv4/IPv6 datagram append paths did not set this flag when splicing pages into UDP skbs. That leaves an ESP-in-UDP packet made from shared pipe pages looking like an ordinary uncloned nonlinear skb. ESP input then takes the no-COW fast path for uncloned skbs without a frag_list and decrypts in place over data that is not owned privately by the skb. Mark IPv4/IPv6 datagram splice frags with SKBFL_SHARED_FRAG, matching TCP. Also make ESP input fall back to skb_cow_data() when the flag is present, so ESP does not decrypt externally backed frags in place. Private nonlinear skb frags still use the existing fast path. This intentionally does not change ESP output. In esp_output_head(), the path that appends the ESP trailer to existing skb tailroom without calling skb_cow_data() is not reachable for nonlinear skbs: skb_tailroom() returns zero when skb->data_len is nonzero, while ESP tailen is positive.
Thus ESP output will either use the separate destination-frag path or fall back to skb_cow_data().
(CVE-2026-43284)
請注意，Nessus 並未測試此問題，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-2026：1778261157 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: 352379
檔案名稱: tuxcare_centos_8.5_CLSA-2026-1778261157.nasl
版本: 1.2
類型: Local
代理程式: unix
已發布: 2026/9/30
已更新: 2026/10/1
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: Critical
分數: 9.5
百分位數: 99.87
Vendor
Vendor Severity: Important
CVSS v2
風險因素: Medium
基本分數: 6.8
時間性分數: 5.9
媒介: CVSS2#AV:L/AC:L/Au:S/C:C/I:C/A:C
CVSS 評分資料來源: CVE-2026-43284
CVSS v3
風險因素: High
基本分數: 7.8
時間性分數: 7.5
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:H/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: 2026/5/8
弱點發布日期: 2026/5/8
可惡意利用
Core Impact
Metasploit (xfrm-ESP Page-Cache Write via CVE-2026-43284)
參考資訊
CVE: CVE-2026-43284
CLSA: 2026:1778261157