Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: ipv6: fix fib6 walker UAF on seq stop ipv6_route_iter_active() treats a walker in FWS_U at the table root as already unlinked. fib6_del_route() can move a still-linked walker into that same state when the current leaf is the last route at the root, so ipv6_route_native_seq_stop() skips fib6_walker_unlink(). The seq private object can then be freed while it remains on net->ipv6.fib6_walkers. A later route deletion walks the dangling list and uses the freed walker. Use the list head as membership state and reinitialize it when unlinking. Keep the existing w->node check so a never-started iterator with a zeroed private object is not treated as linked. The same stop helper is used by /proc/net/ipv6_route and by the BPF ipv6_route iterator. The BPF show path only widens the race.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7 before 9a3f73d62c86271614eda4c43315230896a37018; affected 8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7 before 63407cddabc5992b5ac03af165559f4a1968a032; affected 8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7 before 05b687ee04f816658f4a9cf586f4d2f129157943; affected 8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7 before 14fdaba201fdff92a3e45994e02bccda409cb19d; affected 8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7 before 0eede1689610e9eeaf729ba86fd1321799eb91a0; affected 8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7 before b89b691dd00bf39b9ba39ab9446f8c62f419fa7b; affected 8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7 before 4553cfafa8d05c4ce20b1d18f79d9bb3b303fc02; affected 8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7 before 19b4ed644d68098cc62ab612727f40d30f43476c |
| Linux / Linux | affected 3.13; unaffected 0 before 3.13; unaffected 5.10.271 through 5.10.*; unaffected 5.15.222 through 5.15.*; unaffected 6.1.189 through 6.1.*; unaffected 6.6.158 through 6.6.*; unaffected 6.12.111 through 6.12.*; unaffected 6.18.53 through 6.18.*; unaffected 7.2.7 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
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