{"id":"CVE-2026-31679","title":"openvswitch: validate MPLS set/set_masked payload length","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nopenvswitch: validate MPLS set/set_masked payload length\n\nvalidate_set() accepted OVS_KEY_ATTR_MPLS as variable-sized payload for\nSET/SET_MASKED actions. In action hand…","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 >= fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 < 68f32ef0683c8d1c05cd2e4f16818fa63ff59c6f","Linux >= fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 < 4cae986225f8b8679ad86b924918e7d75a96aa61","Linux >= fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 < 8ed7b9930cbc3bc71f868fa79a68700ac88d586a","Linux >= fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 < c1f97152df8dfb17e855ddf0fc409b7bd13e9700","Linux >= fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 < 98de18d327ef8cbbb704980e359e4872d8c28997","Linux >= fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 < bd50c7484c3bb34097571c1334174fb8b7408036","Linux >= fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 < 2ca33b88a79ca42f017ae0f7011280325655438e","Linux >= fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 < 546b68ac893595877ffbd7751e5c55fd1c43ede6","Linux 5.5"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-16T15:12:20.188389Z"},"published":"2026-04-25","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:20:23.730Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-31679","references":[{"url":"https://git.kernel.org/stable/c/68f32ef0683c8d1c05cd2e4f16818fa63ff59c6f"},{"url":"https://git.kernel.org/stable/c/4cae986225f8b8679ad86b924918e7d75a96aa61"},{"url":"https://git.kernel.org/stable/c/8ed7b9930cbc3bc71f868fa79a68700ac88d586a"},{"url":"https://git.kernel.org/stable/c/c1f97152df8dfb17e855ddf0fc409b7bd13e9700"},{"url":"https://git.kernel.org/stable/c/98de18d327ef8cbbb704980e359e4872d8c28997"},{"url":"https://git.kernel.org/stable/c/bd50c7484c3bb34097571c1334174fb8b7408036"},{"url":"https://git.kernel.org/stable/c/2ca33b88a79ca42f017ae0f7011280325655438e"},{"url":"https://git.kernel.org/stable/c/546b68ac893595877ffbd7751e5c55fd1c43ede6"}],"tags":["cve.org"],"epss":0.00167,"epssPercentile":0.05525,"ingestedAt":"2026-10-16T17:24:46.671Z","slug":"CVE-2026-31679","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nopenvswitch: validate MPLS set/set_masked payload length\n\nvalidate_set() accepted OVS_KEY_ATTR_MPLS as variable-sized payload for\nSET/SET_MASKED actions. In action handling, OVS expects fixed-size\nMPLS key data (struct ovs_key_mpls).\n\nUse the already normalized key_len (masked case included) and reject\nnon-matching MPLS action key sizes.\n\nReject invalid MPLS action payload lengths early.\n\n## Affected\n\n- `Linux >= fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 < 68f32ef0683c8d1c05cd2e4f16818fa63ff59c6f`\n- `Linux >= fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 < 4cae986225f8b8679ad86b924918e7d75a96aa61`\n- `Linux >= fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 < 8ed7b9930cbc3bc71f868fa79a68700ac88d586a`\n- `Linux >= fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 < c1f97152df8dfb17e855ddf0fc409b7bd13e9700`\n- `Linux >= fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 < 98de18d327ef8cbbb704980e359e4872d8c28997`\n- `Linux >= fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 < bd50c7484c3bb34097571c1334174fb8b7408036`\n- `Linux >= fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 < 2ca33b88a79ca42f017ae0f7011280325655438e`\n- `Linux >= fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 < 546b68ac893595877ffbd7751e5c55fd1c43ede6`\n- `Linux 5.5`\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":[]}