Improper control of a resource through its lifetime in Linux kernel - CVE-2026-43012
Published: May 2, 2026
Vulnerability identifier: #VU128895
CSH Severity: Low
CVSS v4.0: 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
CVE-ID: CVE-2026-43012
CWE-ID: CWE-664
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
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.
How to mitigate CVE-2026-43012
Install security update from vendor's repository.