{"id":"CVE-2026-52920","title":"netfilter: xt_policy: fix strict mode inbound policy matching","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: xt_policy: fix strict mode inbound policy matching\n\nmatch_policy_in() walks sec_path entries from the last transform to the\nfirst one, but strict policy matc…","severity":"high","cvss":8.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= c4b885139203d37f76662c37ae645fe8e0f4e4e5 < eb323f7b82d2e2f638de0cc2a177803eb20e0707","Linux >= c4b885139203d37f76662c37ae645fe8e0f4e4e5 < fc1c518bb1f054831ecabb32da9b8e1dff9699c6","Linux >= c4b885139203d37f76662c37ae645fe8e0f4e4e5 < f98b7f85e04b40e28b08c461ded0cc79f14f5509","Linux >= c4b885139203d37f76662c37ae645fe8e0f4e4e5 < 82664d0f1ba25e4f9a71994954abae24c60f4067","Linux >= c4b885139203d37f76662c37ae645fe8e0f4e4e5 < b130a6eefa02bd4d475f2f059da8bcfb3e7d18d9","Linux >= c4b885139203d37f76662c37ae645fe8e0f4e4e5 < 938867e870fb5471bb16f442aeac81326e05bf65","Linux >= c4b885139203d37f76662c37ae645fe8e0f4e4e5 < 392cc1d8408b5665215c1e9290bbf0f92339b043","Linux >= c4b885139203d37f76662c37ae645fe8e0f4e4e5 < 4b2b4d7d4e203c92db8966b163edfacb1f0e1e29","Linux 2.6.17"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-16T15:22:43.940602Z"},"published":"2026-06-24","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:31:19.057Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-52920","references":[{"url":"https://git.kernel.org/stable/c/eb323f7b82d2e2f638de0cc2a177803eb20e0707"},{"url":"https://git.kernel.org/stable/c/fc1c518bb1f054831ecabb32da9b8e1dff9699c6"},{"url":"https://git.kernel.org/stable/c/f98b7f85e04b40e28b08c461ded0cc79f14f5509"},{"url":"https://git.kernel.org/stable/c/82664d0f1ba25e4f9a71994954abae24c60f4067"},{"url":"https://git.kernel.org/stable/c/b130a6eefa02bd4d475f2f059da8bcfb3e7d18d9"},{"url":"https://git.kernel.org/stable/c/938867e870fb5471bb16f442aeac81326e05bf65"},{"url":"https://git.kernel.org/stable/c/392cc1d8408b5665215c1e9290bbf0f92339b043"},{"url":"https://git.kernel.org/stable/c/4b2b4d7d4e203c92db8966b163edfacb1f0e1e29"}],"tags":["cve.org"],"epss":0.00299,"epssPercentile":0.21134,"ingestedAt":"2026-10-16T17:24:46.719Z","slug":"CVE-2026-52920","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: xt_policy: fix strict mode inbound policy matching\n\nmatch_policy_in() walks sec_path entries from the last transform to the\nfirst one, but strict policy matching needs to consume info->pol[] in\nthe same forward order as the rule layout.\n\nDerive the strict-match policy position from the number of transforms\nalready consumed so that multi-element inbound rules are matched\nconsistently.\n\n## Affected\n\n- `Linux >= c4b885139203d37f76662c37ae645fe8e0f4e4e5 < eb323f7b82d2e2f638de0cc2a177803eb20e0707`\n- `Linux >= c4b885139203d37f76662c37ae645fe8e0f4e4e5 < fc1c518bb1f054831ecabb32da9b8e1dff9699c6`\n- `Linux >= c4b885139203d37f76662c37ae645fe8e0f4e4e5 < f98b7f85e04b40e28b08c461ded0cc79f14f5509`\n- `Linux >= c4b885139203d37f76662c37ae645fe8e0f4e4e5 < 82664d0f1ba25e4f9a71994954abae24c60f4067`\n- `Linux >= c4b885139203d37f76662c37ae645fe8e0f4e4e5 < b130a6eefa02bd4d475f2f059da8bcfb3e7d18d9`\n- `Linux >= c4b885139203d37f76662c37ae645fe8e0f4e4e5 < 938867e870fb5471bb16f442aeac81326e05bf65`\n- `Linux >= c4b885139203d37f76662c37ae645fe8e0f4e4e5 < 392cc1d8408b5665215c1e9290bbf0f92339b043`\n- `Linux >= c4b885139203d37f76662c37ae645fe8e0f4e4e5 < 4b2b4d7d4e203c92db8966b163edfacb1f0e1e29`\n- `Linux 2.6.17`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":46,"depthScoreParts":{"impact":45.7,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}