CVE-2026-23111— Linux kernel 安全漏洞
一分钟漏洞结论
影响对象
Linux Linux
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于nft_map_catchall_activate函数中存在反向的生成掩码检查逻辑错误，可能导致事务回滚时元素状态处理不当。
已观察到在野利用
github_trending · medium
可能的 ATT&CK 技术 1 AI
T1068 · Exploitation for Privilege Escalation影响版本矩阵 24
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 25aa2ad37c2162be1c0bc4fe6397f7e4c13f00f8< 8c760ba4e36c750379d13569f23f5a6e185333f5 |
affected |
d60be2da67d172aecf866302c91ea11533eca4d9< b9b6573421de51829f7ec1cce76d85f5f6fbbd7f |
affected | ||
628bd3e49cba1c066228e23d71a852c23e26da73< 42c574c1504aa089a0a142e4c13859327570473d |
affected | ||
628bd3e49cba1c066228e23d71a852c23e26da73< 1444ff890b4653add12f734ffeffc173d42862dd |
affected | ||
628bd3e49cba1c066228e23d71a852c23e26da73< 8b68a45f9722f2babe9e7bad00aa74638addf081 |
affected | ||
628bd3e49cba1c066228e23d71a852c23e26da73< f41c5d151078c5348271ffaf8e7410d96f2d82f8 |
affected | ||
bc9f791d2593f17e39f87c6e2b3a36549a3705b1 |
affected | ||
3c7ec098e3b588434a8b07ea9b5b36f04cef1f50 |
affected | ||
| … +16 条更多 | |||
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一、 漏洞 CVE-2026-23111 基础信息
漏洞信息
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Vulnerability Title
netfilter: nf_tables: fix inverted genmask check in nft_map_catchall_activate()
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nf_tables: fix inverted genmask check in nft_map_catchall_activate()
nft_map_catchall_activate() has an inverted element activity check
compared to its non-catchall counterpart nft_mapelem_activate() and
compared to what is logically required.
nft_map_catchall_activate() is called from the abort path to re-activate
catchall map elements that were deactivated during a failed transaction.
It should skip elements that are already active (they don't need
re-activation) and process elements that are inactive (they need to be
restored). Instead, the current code does the opposite: it skips inactive
elements and processes active ones.
Compare the non-catchall activate callback, which is correct:
nft_mapelem_activate():
if (nft_set_elem_active(ext, iter->genmask))
return 0; /* skip active, process inactive */
With the buggy catchall version:
nft_map_catchall_activate():
if (!nft_set_elem_active(ext, genmask))
continue; /* skip inactive, process active */
The consequence is that when a DELSET operation is aborted,
nft_setelem_data_activate() is never called for the catchall element.
For NFT_GOTO verdict elements, this means nft_data_hold() is never
called to restore the chain->use reference count. Each abort cycle
permanently decrements chain->use. Once chain->use reaches zero,
DELCHAIN succeeds and frees the chain while catchall verdict elements
still reference it, resulting in a use-after-free.
This is exploitable for local privilege escalation from an unprivileged
user via user namespaces + nftables on distributions that enable
CONFIG_USER_NS and CONFIG_NF_TABLES.
Fix by removing the negation so the check matches nft_mapelem_activate():
skip active elements, process inactive ones.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于nft_map_catchall_activate函数中存在反向的生成掩码检查逻辑错误，可能导致事务回滚时元素状态处理不当。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
二、漏洞 CVE-2026-23111 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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IV. Related Vulnerabilities
V. Comments for CVE-2026-23111
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