SB20260727373 - Race condition in Linux kernel mlx5 core driver

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-64210)

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 the mlx5e ICOSQ handling in the Linux kernel mlx5 driver when processing NAPI poll work during CPU affinity changes. A local user can trigger concurrent ICOSQ operations to cause a denial of service.

The issue occurs when affinity changes while XSK work remains pending.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/8d3b91e7d81000d295cd914d4d9d6f860252e2bf
• https://git.kernel.org/stable/c/c326f9c68921e2f14dfcecb2f6b4216313d50248