SB20260528167 - Deadlock in Linux kernel mlx5 core driver

Description

This security bulletin contains information about 1 vulnerability.

1) Deadlock (CVE-ID: CVE-2026-45907)

CWE-ID: CWE-833 - Deadlock

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 incorrect lock ordering in devlink health reporter recovery paths in the mlx5e driver when handling recovery work triggered by device error conditions. A local user can trigger error recovery and deadlock the kernel networking stack to cause a denial of service.

The issue affects recovery flows involving mlx5e_tx_err_cqe_work, mlx5e_reporter_rx_timeout, mlx5e_reporter_tx_ptpsq_unhealthy, and mlx5e_reporter_tx_timeout.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/4329514c61abefe4961541b128c549b017bab5ad
• https://git.kernel.org/stable/c/63f9d5fb4d8040077df801ca3270e2f02d55e0d9
• https://git.kernel.org/stable/c/83ac0304a2d77519dae1e54c9713cbe1aedf19c9