{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-31682","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-03-09T15:48:24.130Z","datePublished":"2026-04-25T08:46:59.106Z","dateUpdated":"2026-09-08T08:48:09.287Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T12:24:27.851Z"},"descriptions":[{"lang":"en","value":"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 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."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","baseScore":9.1,"baseSeverity":"CRITICAL"},"scenarios":[{"lang":"en","value":"AV:N - The vulnerable code is reached by received IPv6/ICMPv6 Neighbor Solicitation traffic on a Linux bridge port before any protocol authentication. In bridged physical or virtual deployments, a network peer can send the crafted packet to the affected bridge path.\nAC:L - There is no race, and the attacker controls the packet contents and can repeat attempts to hit a non-linear skb receive path. Neighbor suppression and a valid neighbor/FDB state are deployment prerequisites, but not per-attempt conditions outside a reasonable affected configuration.\nPR:N - The packet receive path has no credential or authentication check before `br_nd_send()` is reached. CAP_NET_ADMIN is needed to configure bridge neighbor suppression, but exploiting an already configured bridge requires no privileges.\nUI:N - No victim user action is required once the bridge is in the affected configuration. The attacker only needs to send crafted network traffic.\nS:U - The vulnerable component and impacted resources are the same kernel networking/bridge security authority. This is not a hypervisor, IOMMU, or separate security-scope escape by itself.\nC:H - The bug is an out-of-bounds read past the skb linear area while parsing attacker-controlled ND options. The read data can influence bytes copied into the generated Neighbor Advertisement, and under the required rule an OOB read that is not strictly bounded to a few bytes is High.\nI:N - The vulnerable operation reads memory past the linear skb buffer but does not write to kernel memory or provide a direct data-modification primitive. The generated reply may be misaddressed, but the bug does not give meaningful integrity modification.\nA:H - Reading past the linear buffer can trigger a kernel fault/oops or panic depending on skb layout and memory mapping. The attack can be repeated remotely against the bridge receive path, making availability impact High."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bridge/br_arp_nd_proxy.c"],"versions":[{"version":"ed842faeb2bd49256f00485402f3113205f91d30","lessThan":"c68433fd291c9e88c00292095172c62d1997d662","status":"affected","versionType":"git"},{"version":"ed842faeb2bd49256f00485402f3113205f91d30","lessThan":"4f397b950c916e9a1f8a4fce04ea0110206cad47","status":"affected","versionType":"git"},{"version":"ed842faeb2bd49256f00485402f3113205f91d30","lessThan":"bd91ec85aa4c77d645bd2739fc56784157a88ca2","status":"affected","versionType":"git"},{"version":"ed842faeb2bd49256f00485402f3113205f91d30","lessThan":"658261898130da620fc3d0fbb0523efb3366cb55","status":"affected","versionType":"git"},{"version":"ed842faeb2bd49256f00485402f3113205f91d30","lessThan":"2ba4caba423ed94d63006eb1d2227b0332ab7fcd","status":"affected","versionType":"git"},{"version":"ed842faeb2bd49256f00485402f3113205f91d30","lessThan":"9c55e41c73af5c4511070933b1bd25248521270c","status":"affected","versionType":"git"},{"version":"ed842faeb2bd49256f00485402f3113205f91d30","lessThan":"3a30f6469b058574f49efde61cd6f5d79e576053","status":"affected","versionType":"git"},{"version":"ed842faeb2bd49256f00485402f3113205f91d30","lessThan":"a01aee7cafc575bb82f5529e8734e7052f9b16ea","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bridge/br_arp_nd_proxy.c"],"versions":[{"version":"4.15","status":"affected"},{"version":"0","lessThan":"4.15","status":"unaffected","versionType":"semver"},{"version":"5.10.253","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.203","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.168","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.134","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.81","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.22","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"6.19.12","lessThanOrEqual":"6.19.*","status":"unaffected","versionType":"semver"},{"version":"7.0","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.15","versionEndExcluding":"5.10.253"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.15","versionEndExcluding":"5.15.203"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.15","versionEndExcluding":"6.1.168"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.15","versionEndExcluding":"6.6.134"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.15","versionEndExcluding":"6.12.81"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.15","versionEndExcluding":"6.18.22"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.15","versionEndExcluding":"6.19.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.15","versionEndExcluding":"7.0"}]}]}],"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"}],"title":"bridge: 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