CVE - CVE-2022-49904

CVE-ID
CVE-2022-49904	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/0d38b4ca6679e72860ff8730e79bb99d0e9fa3b0 URL:https://git.kernel.org/stable/c/0d38b4ca6679e72860ff8730e79bb99d0e9fa3b0 MISC:https://git.kernel.org/stable/c/1c89642e7f2b7ecc9635610653f5c2f0276c0051 URL:https://git.kernel.org/stable/c/1c89642e7f2b7ecc9635610653f5c2f0276c0051 MISC:https://git.kernel.org/stable/c/2b45d6d0c41cb9593868e476681efb1aae5078a1 URL:https://git.kernel.org/stable/c/2b45d6d0c41cb9593868e476681efb1aae5078a1 MISC:https://git.kernel.org/stable/c/a99a8ec4c62180c889482a2ff6465033e0743458 URL:https://git.kernel.org/stable/c/a99a8ec4c62180c889482a2ff6465033e0743458 MISC:https://git.kernel.org/stable/c/b49f6b2f21f543d4dc88fb7b1ec2adccb822f27c URL:https://git.kernel.org/stable/c/b49f6b2f21f543d4dc88fb7b1ec2adccb822f27c MISC:https://git.kernel.org/stable/c/b736592de2aa53aee2d48d6b129bc0c892007bbe URL:https://git.kernel.org/stable/c/b736592de2aa53aee2d48d6b129bc0c892007bbe MISC:https://git.kernel.org/stable/c/f8017317cb0b279b8ab98b0f3901a2e0ac880dad URL:https://git.kernel.org/stable/c/f8017317cb0b279b8ab98b0f3901a2e0ac880dad
Assigning CNA
kernel.org
Date Record Created
20250501	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20250501)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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