{"id":"CVE-2026-97940","revision":"8cd3b0640a37491f973919b5ba6cbcf8","records":[{"revision":"8cd3b0640a37491f973919b5ba6cbcf8","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-97940","aliases":[],"title":"ipv6: fix fib6 walker UAF on seq stop","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: fix fib6 walker UAF on seq stop\n\nipv6_route_iter_active() treats a walker in FWS_U at the table root as\nalready unlinked. fib6_del_route() can move a still-linked walker into\nthat same state when the current leaf is the last route at the root,\nso ipv6_route_native_seq_stop() skips fib6_walker_unlink(). The seq\nprivate object can then be freed while it remains on\nnet->ipv6.fib6_walkers. A later route deletion walks the dangling list\nand uses the freed walker.\n\nUse the list head as membership state and reinitialize it when\nunlinking. Keep the existing w->node check so a never-started iterator\nwith a zeroed private object is not treated as linked.\n\nThe same stop helper is used by /proc/net/ipv6_route and by the BPF\nipv6_route iterator. The BPF show path only widens the race.","state":0,"publishedAt":"2026-09-25T10:22:52.936+00:00","modifiedAt":"2026-10-19T09:11:06.854+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/ipv6/ip6_fib.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7\",\n                            \"lessThan\": \"9a3f73d62c86271614eda4c43315230896a37018\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7\",\n                            \"lessThan\": \"63407cddabc5992b5ac03af165559f4a1968a032\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7\",\n                            \"lessThan\": \"05b687ee04f816658f4a9cf586f4d2f129157943\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7\",\n                            \"lessThan\": \"14fdaba201fdff92a3e45994e02bccda409cb19d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7\",\n                            \"lessThan\": \"0eede1689610e9eeaf729ba86fd1321799eb91a0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7\",\n                            \"lessThan\": \"b89b691dd00bf39b9ba39ab9446f8c62f419fa7b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7\",\n                            \"lessThan\": \"4553cfafa8d05c4ce20b1d18f79d9bb3b303fc02\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7\",\n                            \"lessThan\": \"19b4ed644d68098cc62ab612727f40d30f43476c\",\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/ipv6/ip6_fib.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"3.13\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"3.13\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.271\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.222\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.189\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.158\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.111\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.53\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.7\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/9a3f73d62c86271614eda4c43315230896a37018","https://git.kernel.org/stable/c/63407cddabc5992b5ac03af165559f4a1968a032","https://git.kernel.org/stable/c/05b687ee04f816658f4a9cf586f4d2f129157943","https://git.kernel.org/stable/c/14fdaba201fdff92a3e45994e02bccda409cb19d","https://git.kernel.org/stable/c/0eede1689610e9eeaf729ba86fd1321799eb91a0","https://git.kernel.org/stable/c/b89b691dd00bf39b9ba39ab9446f8c62f419fa7b","https://git.kernel.org/stable/c/4553cfafa8d05c4ce20b1d18f79d9bb3b303fc02","https://git.kernel.org/stable/c/19b4ed644d68098cc62ab612727f40d30f43476c"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-97940","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-97940","identifiers":["CVE-2026-97940"]},"retained":false,"historicalAffected":[]}],"coverage":[]}