{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-43452","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-05-01T14:12:56.010Z","datePublished":"2026-05-08T14:22:17.361Z","dateUpdated":"2026-05-11T22:24:51.810Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T22:24:51.810Z"},"descriptions":[{"lang":"en","value":"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."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H","baseScore":8.2,"baseSeverity":"HIGH"}}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/netfilter/xt_dccp.c","net/netfilter/xt_tcpudp.c"],"versions":[{"version":"2e4e6a17af35be359cc8f1c924f8f198fbd478cc","lessThan":"c2a445367a496a3c25dbc940c10c8bd1cfd4c14a","status":"affected","versionType":"git"},{"version":"2e4e6a17af35be359cc8f1c924f8f198fbd478cc","lessThan":"ae1e1267650638136b84c23f2b31250f0ccb6823","status":"affected","versionType":"git"},{"version":"2e4e6a17af35be359cc8f1c924f8f198fbd478cc","lessThan":"c39f84e4be1be63fc60ca7141ea7b76edcea5907","status":"affected","versionType":"git"},{"version":"2e4e6a17af35be359cc8f1c924f8f198fbd478cc","lessThan":"9b94f0e42ed248eb31929da84ed9f5310d7ff540","status":"affected","versionType":"git"},{"version":"2e4e6a17af35be359cc8f1c924f8f198fbd478cc","lessThan":"5b18b8b35c7cded2d17b2b2604c9b0694ff48d1c","status":"affected","versionType":"git"},{"version":"2e4e6a17af35be359cc8f1c924f8f198fbd478cc","lessThan":"bc18551c6169eac5ed813778d3e3e484002dbbe5","status":"affected","versionType":"git"},{"version":"2e4e6a17af35be359cc8f1c924f8f198fbd478cc","lessThan":"d04800323336eebf441d153f43234eac9b833d36","status":"affected","versionType":"git"},{"version":"2e4e6a17af35be359cc8f1c924f8f198fbd478cc","lessThan":"cfe770220ac2dbd3e104c6b45094037455da81d4","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/netfilter/xt_dccp.c","net/netfilter/xt_tcpudp.c"],"versions":[{"version":"2.6.16","status":"affected"},{"version":"0","lessThan":"2.6.16","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":"6.1.167","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.130","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.78","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.19","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"6.19.9","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":"2.6.16","versionEndExcluding":"5.10.253"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.16","versionEndExcluding":"5.15.203"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.16","versionEndExcluding":"6.1.167"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.16","versionEndExcluding":"6.6.130"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.16","versionEndExcluding":"6.12.78"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.16","versionEndExcluding":"6.18.19"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.16","versionEndExcluding":"6.19.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.16","versionEndExcluding":"7.0"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/c2a445367a496a3c25dbc940c10c8bd1cfd4c14a"},{"url":"https://git.kernel.org/stable/c/ae1e1267650638136b84c23f2b31250f0ccb6823"},{"url":"https://git.kernel.org/stable/c/c39f84e4be1be63fc60ca7141ea7b76edcea5907"},{"url":"https://git.kernel.org/stable/c/9b94f0e42ed248eb31929da84ed9f5310d7ff540"},{"url":"https://git.kernel.org/stable/c/5b18b8b35c7cded2d17b2b2604c9b0694ff48d1c"},{"url":"https://git.kernel.org/stable/c/bc18551c6169eac5ed813778d3e3e484002dbbe5"},{"url":"https://git.kernel.org/stable/c/d04800323336eebf441d153f43234eac9b833d36"},{"url":"https://git.kernel.org/stable/c/cfe770220ac2dbd3e104c6b45094037455da81d4"}],"title":"netfilter: x_tables: guard option walkers against 1-byte tail reads","x_generator":{"engine":"bippy-1.2.0"}}}}