{"id":"CVE-2026-31682","title":"bridge: br_nd_send: linearize skb before parsing ND options","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nbridge: br_nd_send: linearize skb before parsing ND options\n\nbr_nd_send() parses neighbour discovery options from ns->opt[] and\nassumes that these options are in the li…","severity":"critical","cvss":9.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= ed842faeb2bd49256f00485402f3113205f91d30 < c68433fd291c9e88c00292095172c62d1997d662","Linux >= ed842faeb2bd49256f00485402f3113205f91d30 < 4f397b950c916e9a1f8a4fce04ea0110206cad47","Linux >= ed842faeb2bd49256f00485402f3113205f91d30 < bd91ec85aa4c77d645bd2739fc56784157a88ca2","Linux >= ed842faeb2bd49256f00485402f3113205f91d30 < 658261898130da620fc3d0fbb0523efb3366cb55","Linux >= ed842faeb2bd49256f00485402f3113205f91d30 < 2ba4caba423ed94d63006eb1d2227b0332ab7fcd","Linux >= ed842faeb2bd49256f00485402f3113205f91d30 < 9c55e41c73af5c4511070933b1bd25248521270c","Linux >= ed842faeb2bd49256f00485402f3113205f91d30 < 3a30f6469b058574f49efde61cd6f5d79e576053","Linux >= ed842faeb2bd49256f00485402f3113205f91d30 < a01aee7cafc575bb82f5529e8734e7052f9b16ea","Linux 4.15"],"published":"2026-04-25","updated":"2026-09-08","sourceUpdated":"2026-09-08T08:48:09.287Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-31682","references":[{"url":"https://git.kernel.org/stable/c/c68433fd291c9e88c00292095172c62d1997d662"},{"url":"https://git.kernel.org/stable/c/4f397b950c916e9a1f8a4fce04ea0110206cad47"},{"url":"https://git.kernel.org/stable/c/bd91ec85aa4c77d645bd2739fc56784157a88ca2"},{"url":"https://git.kernel.org/stable/c/658261898130da620fc3d0fbb0523efb3366cb55"},{"url":"https://git.kernel.org/stable/c/2ba4caba423ed94d63006eb1d2227b0332ab7fcd"},{"url":"https://git.kernel.org/stable/c/9c55e41c73af5c4511070933b1bd25248521270c"},{"url":"https://git.kernel.org/stable/c/3a30f6469b058574f49efde61cd6f5d79e576053"},{"url":"https://git.kernel.org/stable/c/a01aee7cafc575bb82f5529e8734e7052f9b16ea"}],"tags":["cve.org"],"epss":0.00485,"epssPercentile":0.40884,"ingestedAt":"2026-09-08T15:33:26.989Z","slug":"CVE-2026-31682","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nbridge: br_nd_send: linearize skb before parsing ND options\n\nbr_nd_send() parses neighbour discovery options from ns->opt[] and\nassumes that these options are in the linear part of request.\n\nIts callers only guarantee that the ICMPv6 header and target address\nare available, so the option area can still be non-linear. Parsing\nns->opt[] in that case can access data past the linear buffer.\n\nLinearize request before option parsing and derive ns from the linear\nnetwork header.\n\n## Affected\n\n- `Linux >= ed842faeb2bd49256f00485402f3113205f91d30 < c68433fd291c9e88c00292095172c62d1997d662`\n- `Linux >= ed842faeb2bd49256f00485402f3113205f91d30 < 4f397b950c916e9a1f8a4fce04ea0110206cad47`\n- `Linux >= ed842faeb2bd49256f00485402f3113205f91d30 < bd91ec85aa4c77d645bd2739fc56784157a88ca2`\n- `Linux >= ed842faeb2bd49256f00485402f3113205f91d30 < 658261898130da620fc3d0fbb0523efb3366cb55`\n- `Linux >= ed842faeb2bd49256f00485402f3113205f91d30 < 2ba4caba423ed94d63006eb1d2227b0332ab7fcd`\n- `Linux >= ed842faeb2bd49256f00485402f3113205f91d30 < 9c55e41c73af5c4511070933b1bd25248521270c`\n- `Linux >= ed842faeb2bd49256f00485402f3113205f91d30 < 3a30f6469b058574f49efde61cd6f5d79e576053`\n- `Linux >= ed842faeb2bd49256f00485402f3113205f91d30 < a01aee7cafc575bb82f5529e8734e7052f9b16ea`\n- `Linux 4.15`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":50,"depthScoreParts":{"impact":50.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}