Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: ipv6: Fix null-ptr-deref in fib6_nh_mtu_change(). fib6_nh_mtu_change() re-fetches idev via __in6_dev_get(arg->dev) and dereferences idev->cnf.mtu6 without a NULL check. addrconf_ifdown() clears dev->ip6_ptr with RCU_INIT_POINTER() after rt6_disable_ip() has released tb6_lock, so the RA-driven MTU walk can observe a NULL idev and oops. The caller rt6_mtu_change_route() guards its own __in6_dev_get(), but this re-fetch is unguarded; nexthop-backed routes survive addrconf_ifdown()'s flush, so the walk still reaches it after ip6_ptr is nulled. Return 0 when idev is NULL, matching rt6_mtu_change_route() and the fib6_mtu() fix in commit 5ad509c1fdad ("ipv6: Fix null-ptr-deref in fib6_mtu()."). Oops: general protection fault, ... KASAN: null-ptr-deref in range [0x00000000000002a8-0x00000000000002af] RIP: 0010:fib6_nh_mtu_change+0x203/0x990 rt6_mtu_change_route+0x141/0x1d0 __fib6_clean_all+0xd0/0x160 rt6_mtu_change+0xb4/0x100 ndisc_router_discovery+0x24b5/0x2cb0 icmpv6_rcv+0x12e9/0x1710 ipv6_rcv+0x39b/0x410
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected c0b220cf7d80eb8a36ae9f12cae6df4577a6814e before d08d019f2f43a6f9a71e81868bbc326b3afaf37b; affected c0b220cf7d80eb8a36ae9f12cae6df4577a6814e before 1451deca9896957159f0666520a792c1b861af4f; affected c0b220cf7d80eb8a36ae9f12cae6df4577a6814e before b2c70dd3326809429b709a9c7e9220d29923051a; affected c0b220cf7d80eb8a36ae9f12cae6df4577a6814e before 302d57ed7872838b40e56a868fb4c7da7da606e9; affected c0b220cf7d80eb8a36ae9f12cae6df4577a6814e before 80600b5d0f3ecb9324120dc95b5e915130f516c5; affected c0b220cf7d80eb8a36ae9f12cae6df4577a6814e before b0d0eb13a0441a8ebf4f227843deaf494f1e2c33; affected c0b220cf7d80eb8a36ae9f12cae6df4577a6814e before 6428634f7a0b7878144b4925c37856bef3224967; affected c0b220cf7d80eb8a36ae9f12cae6df4577a6814e before 46c3b8191aad3d032776bf3bebf03efdf5f4b905 |
| Linux / Linux | affected 5.3; unaffected 0 before 5.3; unaffected 5.10.261 through 5.10.*; unaffected 5.15.212 through 5.15.*; unaffected 6.1.178 through 6.1.*; unaffected 6.6.145 through 6.6.*; unaffected 6.12.97 through 6.12.*; unaffected 6.18.40 through 6.18.*; unaffected 7.1.5 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/d08d019f2f43a6f9a71e81868bbc326b3afaf37b
- https://git.kernel.org/stable/c/1451deca9896957159f0666520a792c1b861af4f
- https://git.kernel.org/stable/c/b2c70dd3326809429b709a9c7e9220d29923051a
- https://git.kernel.org/stable/c/302d57ed7872838b40e56a868fb4c7da7da606e9
- https://git.kernel.org/stable/c/80600b5d0f3ecb9324120dc95b5e915130f516c5
- https://git.kernel.org/stable/c/b0d0eb13a0441a8ebf4f227843deaf494f1e2c33
- https://git.kernel.org/stable/c/6428634f7a0b7878144b4925c37856bef3224967
- https://git.kernel.org/stable/c/46c3b8191aad3d032776bf3bebf03efdf5f4b905
ADP enrichment
No English description supplied.