{"id":"CVE-2026-97940","published":"2026-09-25T11:17:21.410","lastModified":"2026-09-25T15:18:02.713","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.","cvssScore":7.8,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/0eede1689610e9eeaf729ba86fd1321799eb91a0","tags":[]},{"url":"https://git.kernel.org/stable/c/19b4ed644d68098cc62ab612727f40d30f43476c","tags":[]},{"url":"https://git.kernel.org/stable/c/4553cfafa8d05c4ce20b1d18f79d9bb3b303fc02","tags":[]},{"url":"https://git.kernel.org/stable/c/b89b691dd00bf39b9ba39ab9446f8c62f419fa7b","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}