SB2026082469 - Improper control of a resource through its lifetime in Linux kernel mlx5 core driver

Description

This security bulletin contains information about 1 vulnerability.

1) Improper control of a resource through its lifetime (CVE-ID: CVE-2026-74698)

CWE-ID: CWE-664 - Improper control of a resource through its lifetime

CVSSv4: 6.8 [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]

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

The vulnerability exists due to improper state management in mlx5e_activate_txqsq() when re-activating transmit queue send queues with bytes still in flight. A local user can trigger queue restart conditions to cause a denial of service.

The issue can lead to a kernel BUG in dql_completed() because BQL counters are reset while outstanding TX WQEs remain in flight.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/88664c48d7d1eca8e1ac92da85c89c26af741cf1
• https://git.kernel.org/stable/c/d2897717cd222e575599d903d885c48602699800
• https://git.kernel.org/stable/c/e7386770be1bf810bcd6af39d1e4bfeab3408430