SB2026050983 - Improper locking in Linux kernel md driver

Description

This security bulletin contains information about 1 vulnerability.

1) Improper locking (CVE-ID: CVE-2026-43309)

CWE-ID: CWE-667 - Improper Locking

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:P/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 dm-raid target when stopping a RAID array after suspending the device tree from top to bottom and removing the top-level RAID device. A local user can stop and remove a crafted dm-raid managed array to cause a denial of service.

The issue results in an indefinite block because write-intent bitmap operations are attempted against already suspended metadata devices.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/24783dd06de870d646c25207bae186f78195f912
• https://git.kernel.org/stable/c/338378dfffbdbb8d37a18f0a0c0358812671f91e
• https://git.kernel.org/stable/c/cefcb9297fbdb6d94b61787b4f8d84f55b741470