Description
In the Linux kernel, the following vulnerability has been resolved:
net, neigh: Fix null-ptr-deref in neigh_table_clear()
When IPv6 module gets initialized but hits an error in the middle, kenel panic with:
KASAN: null-ptr-deref in range [0x0000000000000598-0x000000000000059f] CPU: 1 PID: 361 Comm: insmod Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) RIP: 0010:__neigh_ifdown.isra.0+0x24b/0x370 RSP: 0018:ffff888012677908 EFLAGS: 00000202 ... Call Trace: <TASK> neigh_table_clear+0x94/0x2d0 ndisc_cleanup+0x27/0x40 [ipv6] inet6_init+0x21c/0x2cb [ipv6] do_one_initcall+0xd3/0x4d0 do_init_module+0x1ae/0x670 ... Kernel panic - not syncing: Fatal exception
When ipv6 initialization fails, it will try to cleanup and calls:
neigh_table_clear() neigh_ifdown(tbl, NULL) pneigh_queue_purge(&tbl->proxy_queue, dev_net(dev == NULL)) # dev_net(NULL) triggers null-ptr-deref.
Fix it by passing NULL to pneigh_queue_purge() in neigh_ifdown() if dev is NULL, to make kernel not panic immediately.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 9bbaed571c4bf1b62ac8703cb359dc090efc3455, < 0d38b4ca6679e72860ff8730e79bb99d0e9fa3b0; >= 05fdce1ae744dee43c9181fd063c9c0db4f777f2, < b736592de2aa53aee2d48d6b129bc0c892007bbe; >= 51be9dd391fd25872b95708a0250f2f7722d2d8e, < b49f6b2f21f543d4dc88fb7b1ec2adccb822f27c; >= c35adafe42bd6c3bf2aca0a3f523dabc38fc23c8, < 1c89642e7f2b7ecc9635610653f5c2f0276c0051; >= db6fa03d80ab076238fc806c9925d1f8b9639d1b, < 2b45d6d0c41cb9593868e476681efb1aae5078a1; >= 66ba215cb51323e4e55e38fd5f250e0fae0cbc94, < a99a8ec4c62180c889482a2ff6465033e0743458; >= 66ba215cb51323e4e55e38fd5f250e0fae0cbc94, < f8017317cb0b279b8ab98b0f3901a2e0ac880dad; 2dd5ed474115150d8175825bc3b56c6385c3a83b; >= 4.14.292, < 4.14.299; >= 4.19.257, < 4.19.265; >= 5.4.212, < 5.4.224; >= 5.10.141, < 5.10.154; >= 5.15.65, < 5.15.78; >= 5.19.7, < 5.20 |
| Linux | Linux | 6.0 |
References
- https://git.kernel.org/stable/c/0d38b4ca6679e72860ff8730e79bb99d0e9fa3b0Patch
- https://git.kernel.org/stable/c/1c89642e7f2b7ecc9635610653f5c2f0276c0051Patch
- https://git.kernel.org/stable/c/2b45d6d0c41cb9593868e476681efb1aae5078a1Patch
- https://git.kernel.org/stable/c/a99a8ec4c62180c889482a2ff6465033e0743458Patch
- https://git.kernel.org/stable/c/b49f6b2f21f543d4dc88fb7b1ec2adccb822f27cPatch
- https://git.kernel.org/stable/c/b736592de2aa53aee2d48d6b129bc0c892007bbePatch
- https://git.kernel.org/stable/c/f8017317cb0b279b8ab98b0f3901a2e0ac880dadPatch
Timeline
- Published
- May 1, 2025
- Last modified
- Jun 17, 2026
- NVD status
- Modified