CVE-2026-31674 (GCVE-0-2026-31674)
Vulnerability from cvelistv5
Published
2026-04-25 08:46
Modified
2026-10-19 18:56
Severity ?
7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: ip6t_rt: reject oversized addrnr in rt_mt6_check() Reject rt match rules whose addrnr exceeds IP6T_RT_HOPS. rt_mt6() expects addrnr to stay within the bounds of rtinfo->addrs[]. Validate addrnr during rule installation so malformed rules are rejected before the match logic can use an out-of-range value.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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It is not a VM escape, IOMMU bypass, or other cross-scope boundary violation.\\nC:H - `addrnr` indexes beyond `rtinfo-\u003eaddrs[]`, 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\": [{\"x_adpType\": \"supplier\", \"providerMetadata\": {\"orgId\": \"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\", \"shortName\": \"siemens-SADP\", \"dateUpdated\": \"2026-10-15T01:17:44.538Z\"}, \"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\": \"V3.1.7\", \"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\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.7\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.6\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.5\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.7\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.6\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", 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[{\"status\": \"affected\", \"version\": \"V3.1.7\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}], \"references\": [{\"url\": \"https://cert-portal.siemens.com/productcert/html/ssa-082556.html\"}, {\"url\": \"https://cert-portal.siemens.com/productcert/html/ssa-019113.html\"}, {\"url\": \"https://cert-portal.siemens.com/productcert/html/ssa-457936.html\"}]}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-31674\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-10-16T15:12:07.905080Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-125\", \"description\": \"CWE-125 Out-of-bounds Read\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": 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      "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\": \"2026-10-19T18:56:03.661Z\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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