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.

References 8

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

Remediation