CVE-2022-49904

MEDIUM EPSS 5.5%
Published May 1, 20251y ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published May 1, 2025 1y ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
5.5% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 9

VendorProductVersionRange
linuxlinux_kernel*≥4.14.292  –  <4.14.299
linuxlinux_kernel*≥4.19.257  –  <4.19.265
linuxlinux_kernel*≥5.4.212  –  <5.4.224
linuxlinux_kernel*≥5.10.141  –  <5.10.154
linuxlinux_kernel*≥5.15.65  –  <5.15.78
linuxlinux_kernel*≥5.19.7  –  <6.0.8
linuxlinux_kernel6.1any
linuxlinux_kernel6.1any
linuxlinux_kernel6.1any

References 7

  • git.kernel.org https://git.kernel.org/stable/c/0d38b4ca6679e72860ff8730e79bb99d0e9fa3b0
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/1c89642e7f2b7ecc9635610653f5c2f0276c0051
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/2b45d6d0c41cb9593868e476681efb1aae5078a1
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a99a8ec4c62180c889482a2ff6465033e0743458
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b49f6b2f21f543d4dc88fb7b1ec2adccb822f27c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b736592de2aa53aee2d48d6b129bc0c892007bbe
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f8017317cb0b279b8ab98b0f3901a2e0ac880dad
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/0d38b4ca6679e72860ff8730e79bb99d0e9fa3b0
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/1c89642e7f2b7ecc9635610653f5c2f0276c0051
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/2b45d6d0c41cb9593868e476681efb1aae5078a1
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a99a8ec4c62180c889482a2ff6465033e0743458
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b49f6b2f21f543d4dc88fb7b1ec2adccb822f27c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b736592de2aa53aee2d48d6b129bc0c892007bbe
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f8017317cb0b279b8ab98b0f3901a2e0ac880dad
    Patch