SB2026082897 - Race condition in Linux kernel netfilter

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-80668)

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

CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a race condition in nf_conntrack expectation handling when removing or expiring expectations. A local user can trigger concurrent expectation operations to cause a denial of service.

The issue involves an expectation accessing a stale exp->master pointer after the associated master connection has already been released.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/7ec786f4230c2a9b2eaf97a2d45368933b49d2b2
• https://git.kernel.org/stable/c/b8b09dc2bf35a00d4e0556b5d6308c7b917ebda2