{"id":"CVE-2026-31674","title":"netfilter: ip6t_rt: reject oversized addrnr in rt_mt6_check()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ip6t_rt: reject oversized addrnr in rt_mt6_check()\n\nReject rt match rules whose addrnr exceeds IP6T_RT_HOPS.\n\nrt_mt6() expects addrnr to stay within the boun…","severity":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 13e3e30ed3b5b67cc1db2bd58a5d09b0f07debfa","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < af9b7e2b765966457f4ec23be5bd34a141f89574","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 29ea965a1353bc8303877422f79c8211e9ba9c55","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < c6a503a9f4debc654e3a6a7ca1f7fce6a9953c59","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < ded71f5684df16fa645cca5bf4fe6b0cd8a46119","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < d8795fde1f78669a87c87ac29fceab2f104daa8c","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < a28ebf6f99de270d6338ccdc3b49f3e818f99b7b","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 9d3f027327c2fa265f7f85ead41294792c3296ed","Linux 2.6.12"],"published":"2026-04-25","updated":"2026-09-08","sourceUpdated":"2026-09-08T08:48:03.642Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-31674","references":[{"url":"https://git.kernel.org/stable/c/13e3e30ed3b5b67cc1db2bd58a5d09b0f07debfa"},{"url":"https://git.kernel.org/stable/c/af9b7e2b765966457f4ec23be5bd34a141f89574"},{"url":"https://git.kernel.org/stable/c/29ea965a1353bc8303877422f79c8211e9ba9c55"},{"url":"https://git.kernel.org/stable/c/c6a503a9f4debc654e3a6a7ca1f7fce6a9953c59"},{"url":"https://git.kernel.org/stable/c/ded71f5684df16fa645cca5bf4fe6b0cd8a46119"},{"url":"https://git.kernel.org/stable/c/d8795fde1f78669a87c87ac29fceab2f104daa8c"},{"url":"https://git.kernel.org/stable/c/a28ebf6f99de270d6338ccdc3b49f3e818f99b7b"},{"url":"https://git.kernel.org/stable/c/9d3f027327c2fa265f7f85ead41294792c3296ed"}],"tags":["cve.org"],"epss":0.00123,"epssPercentile":0.02387,"ingestedAt":"2026-09-08T15:33:26.989Z","slug":"CVE-2026-31674","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ip6t_rt: reject oversized addrnr in rt_mt6_check()\n\nReject rt match rules whose addrnr exceeds IP6T_RT_HOPS.\n\nrt_mt6() expects addrnr to stay within the bounds of rtinfo->addrs[].\nValidate addrnr during rule installation so malformed rules are rejected\nbefore the match logic can use an out-of-range value.\n\n## Affected\n\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 13e3e30ed3b5b67cc1db2bd58a5d09b0f07debfa`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < af9b7e2b765966457f4ec23be5bd34a141f89574`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 29ea965a1353bc8303877422f79c8211e9ba9c55`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < c6a503a9f4debc654e3a6a7ca1f7fce6a9953c59`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < ded71f5684df16fa645cca5bf4fe6b0cd8a46119`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < d8795fde1f78669a87c87ac29fceab2f104daa8c`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < a28ebf6f99de270d6338ccdc3b49f3e818f99b7b`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 9d3f027327c2fa265f7f85ead41294792c3296ed`\n- `Linux 2.6.12`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":39.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}