{"id":"CVE-2026-43452","revision":null,"records":[{"revision":"ab8deadbca6b416583405e1d13074011","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-43452","aliases":[],"title":"netfilter: x_tables: guard option walkers against 1-byte tail reads","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: x_tables: guard option walkers against 1-byte tail reads\n\nWhen the last byte of options is a non-single-byte option kind, walkers\nthat advance with i += op[i + 1] ? : 1 can read op[i + 1] past the end\nof the option area.\n\nAdd an explicit i == optlen - 1 check before dereferencing op[i + 1]\nin xt_tcpudp and xt_dccp option walkers.","state":0,"publishedAt":"2026-05-08T14:22:17.361+00:00","modifiedAt":"2026-10-19T19:26:36.945+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/netfilter/xt_dccp.c\",\n \"net/netfilter/xt_tcpudp.c\"\n ],\n \"versions\": [\n {\n \"version\": \"2e4e6a17af35be359cc8f1c924f8f198fbd478cc\",\n \"lessThan\": \"c2a445367a496a3c25dbc940c10c8bd1cfd4c14a\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"2e4e6a17af35be359cc8f1c924f8f198fbd478cc\",\n \"lessThan\": \"ae1e1267650638136b84c23f2b31250f0ccb6823\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"2e4e6a17af35be359cc8f1c924f8f198fbd478cc\",\n \"lessThan\": \"c39f84e4be1be63fc60ca7141ea7b76edcea5907\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"2e4e6a17af35be359cc8f1c924f8f198fbd478cc\",\n \"lessThan\": \"9b94f0e42ed248eb31929da84ed9f5310d7ff540\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"2e4e6a17af35be359cc8f1c924f8f198fbd478cc\",\n \"lessThan\": \"5b18b8b35c7cded2d17b2b2604c9b0694ff48d1c\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"2e4e6a17af35be359cc8f1c924f8f198fbd478cc\",\n \"lessThan\": \"bc18551c6169eac5ed813778d3e3e484002dbbe5\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"2e4e6a17af35be359cc8f1c924f8f198fbd478cc\",\n \"lessThan\": \"d04800323336eebf441d153f43234eac9b833d36\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"2e4e6a17af35be359cc8f1c924f8f198fbd478cc\",\n \"lessThan\": \"cfe770220ac2dbd3e104c6b45094037455da81d4\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/netfilter/xt_dccp.c\",\n \"net/netfilter/xt_tcpudp.c\"\n ],\n \"versions\": [\n {\n \"version\": \"2.6.16\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"2.6.16\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.253\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.203\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.167\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.130\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.78\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.19\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.19.9\",\n \"lessThanOrEqual\": \"6.19.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.0\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H","score":8.2,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/c2a445367a496a3c25dbc940c10c8bd1cfd4c14a","https://git.kernel.org/stable/c/ae1e1267650638136b84c23f2b31250f0ccb6823","https://git.kernel.org/stable/c/c39f84e4be1be63fc60ca7141ea7b76edcea5907","https://git.kernel.org/stable/c/9b94f0e42ed248eb31929da84ed9f5310d7ff540","https://git.kernel.org/stable/c/5b18b8b35c7cded2d17b2b2604c9b0694ff48d1c","https://git.kernel.org/stable/c/bc18551c6169eac5ed813778d3e3e484002dbbe5","https://git.kernel.org/stable/c/d04800323336eebf441d153f43234eac9b833d36","https://git.kernel.org/stable/c/cfe770220ac2dbd3e104c6b45094037455da81d4"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-43452","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-43452","identifiers":["CVE-2026-43452"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all 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Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-45d47722bca14f09ac26662adb699591","complete":true,"records":13654,"lastAttemptAt":"2026-11-08T20:47:46.9443819+00:00","lastSuccessAt":"2026-11-08T20:47:46.939+00:00","error":null,"lastVerifiedAt":"2026-11-08T20:47:46.939+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13706,"expectedIdentifiers":13706,"failedIdentifiers":0},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. 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