CentOS Linux 8.5 [TuxCare] 安全更新：bpftool / kernel / kernel-core / kernel-cross-headers / 等 （CENTOS8.5：CLSA-2026：1778261157）
high Nessus 插件 ID 352379
语言：
简介
CentOS Linux 主机缺少一个或多个安全更新。描述
CentOS Linux 8.5 主机上存在安装的程序包，该程序包受到 TuxCare CENTOS8.5：CLSA-2026：1778261157公告中提及的漏洞的影响。- 已修复 Linux 内核中的下列漏洞：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)
请注意，Nessus 尚未测试此问题，而是只依据应用程序自我报告的版本号进行判断。
解决方案
根据 TuxCare 公告 CENTOS8.5：CLSA-2026：1778261157 中的指南更新受影响的程序包。另见
插件详情
严重性: High
ID: 352379
文件名: tuxcare_centos_8.5_CLSA-2026-1778261157.nasl
版本: 1.2
类型: Local
代理: unix
发布时间: 2026/9/30
最近更新时间: 2026/10/1
支持的传感器: Continuous Assessment, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus
风险信息
VPR
风险因素: Critical
分数: 9.5
百分位: 99.87
Vendor
Vendor Severity: Important
CVSS v2
风险因素: Medium
基本分数: 6.8
时间分数: 5.9
矢量: CVSS2#AV:L/AC:L/Au:S/C:C/I:C/A:C
CVSS 分数来源: CVE-2026-43284
CVSS v3
风险因素: High
基本分数: 7.8
时间分数: 7.5
矢量: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
时间矢量: CVSS:3.0/E:H/RL:O/RC:C
漏洞信息
必需的 KB 项: Host/OS/extended-third-party, Host/local_checks_enabled, Host/CentOS/release, Host/CentOS/rpm-list
可利用: true
易利用性: Exploits are available
补丁发布日期: 2026/5/8
漏洞发布日期: 2026/5/8
可利用的方式
Core Impact
Metasploit (xfrm-ESP Page-Cache Write via CVE-2026-43284)
参考资料信息
CVE: CVE-2026-43284
CLSA: 2026:1778261157