SB20260824153 - Race condition in Linux kernel ipv4

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-74662)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to a race condition in inet_frag_create() and the fragment queue timer handling in net/ipv4/inet_fragment.c when processing fragmented packets with a zero or negative fragment timeout. A remote attacker can send specially crafted fragmented network traffic to cause a denial of service.

The issue occurs because the timer may run before the queue is published in the fqdir rhashtable, which can leave a stale hash node after reference handling becomes unbalanced.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/653d7ddf6cba867777a3d14c4f83ace008c5ad13
• https://git.kernel.org/stable/c/928128865e43b197e30688dc1bc991592c97edcf
• https://git.kernel.org/stable/c/9f904dd3e455750e5d4ec9b2f134835811b85a2f