SB2026050246 - 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-2026-43012)

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

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 improper state management in the mlx5 eswitch switchdev mode handling when processing devlink eswitch mode change requests. A local user can trigger a switchdev mode failure and rollback sequence to cause a kernel BUG.

Exploitation requires the ability to issue devlink eswitch mode change operations on the affected device.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/2ebb13f3e8be0b61f72425b34cce60c8b6ad1891
• https://git.kernel.org/stable/c/403186400a1a6166efe7031edc549c15fee4723f
• https://git.kernel.org/stable/c/4363698838b7ec6e8d85b179495889aa7e522f91
• https://git.kernel.org/stable/c/e27153b2bd6e6699b544ac4dfa35d167bed5e642