{"id":"CVE-2026-43452","summary":"netfilter: x_tables: guard option walkers against 1-byte tail reads","details":"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.","modified":"2026-05-28T03:53:24.884234181Z","published":"2026-05-08T14:22:17.361Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43452.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/5b18b8b35c7cded2d17b2b2604c9b0694ff48d1c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9b94f0e42ed248eb31929da84ed9f5310d7ff540"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ae1e1267650638136b84c23f2b31250f0ccb6823"},{"type":"WEB","url":"https://git.kernel.org/stable/c/bc18551c6169eac5ed813778d3e3e484002dbbe5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c2a445367a496a3c25dbc940c10c8bd1cfd4c14a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c39f84e4be1be63fc60ca7141ea7b76edcea5907"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cfe770220ac2dbd3e104c6b45094037455da81d4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d04800323336eebf441d153f43234eac9b833d36"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43452.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43452"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"2e4e6a17af35be359cc8f1c924f8f198fbd478cc"},{"fixed":"c2a445367a496a3c25dbc940c10c8bd1cfd4c14a"},{"fixed":"ae1e1267650638136b84c23f2b31250f0ccb6823"},{"fixed":"c39f84e4be1be63fc60ca7141ea7b76edcea5907"},{"fixed":"9b94f0e42ed248eb31929da84ed9f5310d7ff540"},{"fixed":"5b18b8b35c7cded2d17b2b2604c9b0694ff48d1c"},{"fixed":"bc18551c6169eac5ed813778d3e3e484002dbbe5"},{"fixed":"d04800323336eebf441d153f43234eac9b833d36"},{"fixed":"cfe770220ac2dbd3e104c6b45094037455da81d4"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43452.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.16"},{"fixed":"5.10.253"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.203"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.167"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.130"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.78"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.19"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.9"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43452.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H"}]}