SB20260528116 - Improper control of a resource through its lifetime in Linux kernel md driver

Description

This security bulletin contains information about 1 vulnerability.

1) Improper control of a resource through its lifetime (CVE-ID: CVE-2026-45955)

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 resource lifecycle management in md/md-llbitmap when handling a suspend timeout in llbitmap_suspend_timeout(). A local user can trigger a suspend timeout condition to cause a denial of service.

The issue can leave the percpu_ref in a killed state permanently, making the page control structure unusable for subsequent operations.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/095417d6b669c2dec39a5842ccb94df915f97f54
• https://git.kernel.org/stable/c/2446d099350185caeed19ab2c0270451a97296fb
• https://git.kernel.org/stable/c/d119bd2e1643cc023210ff3c6f0657e4f914e71d