{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-31674", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-03-09T15:48:24.130Z", "datePublished": "2026-04-25T08:46:50.180Z", "dateUpdated": "2026-08-05T12:24:21.417Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:24:21.417Z" }, "descriptions": [ { "lang": "en", "value": "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 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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerable match is installed through the IPv6 iptables setsockopt path, so the attacker must execute local code to submit a malformed rule. Packets only trigger the bad read after that local rule installation step.\nAC:L - No race or external timing condition is required; the attacker controls the malformed `addrnr` value and can generate an IPv6 routing-header packet with enough addresses to reach the out-of-bounds access. The required netfilter match configuration is the affected component rather than an exploitation complexity barrier.\nPR:L - Rule replacement requires `CAP_NET_ADMIN`, but the check is against `sock_net(sk)->user_ns`, making it reachable to an unprivileged local user who can create a user and network namespace. This is Low rather than High under the kernel guidance.\nUI:N - After the attacker installs the malformed rule, triggering occurs by sending traffic through the affected netfilter hook. No victim user action is required.\nS:U - The bug is in kernel netfilter rule evaluation and impacts the same kernel security authority. It is not a VM escape, IOMMU bypass, or other cross-scope boundary violation.\nC:H - `addrnr` indexes beyond `rtinfo->addrs[]`, causing an out-of-bounds kernel memory read during packet matching. The overread can extend well beyond a few bytes, so confidentiality impact is High.\nI:N - The vulnerable operation is an out-of-bounds read used for address comparison, with no write or direct memory modification primitive. It does not by itself provide kernel memory corruption or control-flow modification.\nA:H - The out-of-bounds read can reach beyond the allocated xtables rule blob, especially with attacker-shaped tables and oversized routing-header address counts. Such kernel invalid memory access is capable of causing an oops or panic, so availability impact is High." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ipv6/netfilter/ip6t_rt.c" ], "versions": [ { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "13e3e30ed3b5b67cc1db2bd58a5d09b0f07debfa", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "af9b7e2b765966457f4ec23be5bd34a141f89574", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "29ea965a1353bc8303877422f79c8211e9ba9c55", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "c6a503a9f4debc654e3a6a7ca1f7fce6a9953c59", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "ded71f5684df16fa645cca5bf4fe6b0cd8a46119", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "d8795fde1f78669a87c87ac29fceab2f104daa8c", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "a28ebf6f99de270d6338ccdc3b49f3e818f99b7b", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "9d3f027327c2fa265f7f85ead41294792c3296ed", "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/ipv6/netfilter/ip6t_rt.c" ], "versions": [ { "version": "2.6.12", "status": "affected" }, { "version": "0", "lessThan": "2.6.12", "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": "6.6.131", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.80", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.21", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19.11", "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": "2.6.12", "versionEndExcluding": "5.10.253" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "5.15.203" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.1.168" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.6.131" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.12.80" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.18.21" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.19.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "7.0" } ] } ] } ], "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" } ], "title": "netfilter: ip6t_rt: reject oversized addrnr in rt_mt6_check()", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ 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