What’s Vulnerable › Vulnerabilities

CVE-2026-52920: netfilter: xt_policy: fix strict mode inbound policy matching

• Severity: high (CVSS 8.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-24 · updated 2026-10-19
• Weakness: CWE-682

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_policy: fix strict mode inbound policy matching match_policy_in() walks sec_path entries from the last transform to the first one, but strict policy matching needs to consume info->pol[] in the same forward order as the rule layout. Derive the strict-match policy position from the number of transforms already consumed so that multi-element inbound rules are matched consistently.

Affected products

• Linux kernel: from 2.6.17 before 5.10.258; from 5.11 before 5.15.209; from 5.16 before 6.1.175; from 6.2 before 6.6.141; from 6.7 before 6.12.91; from 6.13 before 6.18.33 — fixed in 5.10.258, 5.15.209, 6.1.175, 6.12.91, 6.18.33, 6.6.141

How to fix

Upgrade to a fixed version: Linux kernel 5.10.258, 5.15.209, 6.1.175, 6.12.91. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/392cc1d8408b5665215c1e9290bbf0f92339b043
• https://git.kernel.org/stable/c/4b2b4d7d4e203c92db8966b163edfacb1f0e1e29
• https://git.kernel.org/stable/c/82664d0f1ba25e4f9a71994954abae24c60f4067
• https://git.kernel.org/stable/c/938867e870fb5471bb16f442aeac81326e05bf65
• https://git.kernel.org/stable/c/b130a6eefa02bd4d475f2f059da8bcfb3e7d18d9
• https://git.kernel.org/stable/c/eb323f7b82d2e2f638de0cc2a177803eb20e0707
• https://git.kernel.org/stable/c/f98b7f85e04b40e28b08c461ded0cc79f14f5509
• https://git.kernel.org/stable/c/fc1c518bb1f054831ecabb32da9b8e1dff9699c6

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