CVE-2026-23409— 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，该漏洞源于差分编码验证存在缺陷，可能导致循环创建。
可能的 ATT&CK 技术 1 AI
T1190 · Exploit Public-Facing Application影响版本矩阵 18
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 031dcc8f4e84fea37dc6f78fdc7288aa7f8386c3< ff7c73744fafe944ed9a7b2b7cf6c8d5557a3d84 |
affected |
031dcc8f4e84fea37dc6f78fdc7288aa7f8386c3< 1439150cd3c411228b387ab5efca92199d2a659a |
affected | ||
031dcc8f4e84fea37dc6f78fdc7288aa7f8386c3< 0fab44285445e9012674396d5c1236a67da518e0 |
affected | ||
031dcc8f4e84fea37dc6f78fdc7288aa7f8386c3< f90e3ecd9e1ed69f1a370f866ceed1f104f3ab4a |
affected | ||
031dcc8f4e84fea37dc6f78fdc7288aa7f8386c3< 34fc60b125ed1d4eb002c76b0664bf0619492167 |
affected | ||
031dcc8f4e84fea37dc6f78fdc7288aa7f8386c3< 623a9d211bbbb031bb1cbdb38b23487648167f8a |
affected | ||
031dcc8f4e84fea37dc6f78fdc7288aa7f8386c3< 1ff4857fac56ac5a90ee63b24db05fa5e91a45aa |
affected | ||
031dcc8f4e84fea37dc6f78fdc7288aa7f8386c3< 39440b137546a3aa383cfdabc605fb73811b6093 |
affected | ||
| … +10 条更多 | |||
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一、 漏洞 CVE-2026-23409 基础信息
漏洞信息
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Vulnerability Title
apparmor: fix differential encoding verification
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
apparmor: fix differential encoding verification
Differential encoding allows loops to be created if it is abused. To
prevent this the unpack should verify that a diff-encode chain
terminates.
Unfortunately the differential encode verification had two bugs.
1. it conflated states that had gone through check and already been
marked, with states that were currently being checked and marked.
This means that loops in the current chain being verified are treated
as a chain that has already been verified.
2. the order bailout on already checked states compared current chain
check iterators j,k instead of using the outer loop iterator i.
Meaning a step backwards in states in the current chain verification
was being mistaken for moving to an already verified state.
Move to a double mark scheme where already verified states get a
different mark, than the current chain being kept. This enables us
to also drop the backwards verification check that was the cause of
the second error as any already verified state is already marked.
来源: CVE Program / CVE List V5
CVSS Information
N/A
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，该漏洞源于差分编码验证存在缺陷，可能导致循环创建。
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-2026-23409 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
AI 生成 POC
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未找到公开 POC。
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同批安全公告 · Linux · 2026-04-01 · 共 11 条
| CVE-2026-23411 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23410 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23408 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23407 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23406 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23405 | Linux kernel 安全漏洞 | |
| CVE-2026-23404 | Linux kernel 安全漏洞 | |
| CVE-2026-23403 | Linux kernel 安全漏洞 | |
| CVE-2026-23402 | Linux kernel 安全漏洞 | |
| CVE-2026-23401 | Linux kernel 安全漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2026-23409
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