SB20260528101 - Race condition in Linux kernel hw mlx5 driver

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-45973)

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

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

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

The vulnerability exists due to a race condition in the RDMA/mlx5 driver bond device handling when unloading the device during a firmware reset in LAG mode. A local user can trigger device teardown during this state to cause a denial of service.

The issue can cause the driver to hang indefinitely while waiting for UMR completion because completions never arrive.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/613f5d4139b6ba801ccd93f9a28943be60d903bc
• https://git.kernel.org/stable/c/6d838873da9cb97551d42316967cc82bf8f8031b
• https://git.kernel.org/stable/c/c8fb5c965ac7d0104872a8e4f6451f3bc6328199
• https://git.kernel.org/stable/c/ebc2164a4cd4314503f1a0c8e7aaf76d7e5fa211