{ "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": "2026-08-05T12:24:27.851Z" }, "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: br_nd_send: linearize skb before parsing ND options", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "x_adpType": "supplier", "providerMetadata": { "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-07-14T12:48:42.022Z" }, "affected": [ { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.6", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.6", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": 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