{"id":"CVE-2026-43452","revision":"ab8deadbca6b416583405e1d13074011","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":[]}