CVE-2026-52920high

netfilter: xt_policy: fix strict mode inbound policy matching

21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 8.3epss 0.3%

exploitation probability

0.3%top 78% of all CVEs

observed exploitation

nono source reports it

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.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H

Affected products

Linux · Linux

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