SB2026062525 - Improper control of a resource through its lifetime in Linux kernel block driver

Description

This security bulletin contains information about 1 vulnerability.

1) Improper control of a resource through its lifetime (CVE-ID: CVE-2026-53124)

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 ublk driver when recovering devices and fetching I/O commands. A local user can cause a ublk server to die after only a subset of I/Os in a queue have been fetched to cause a denial of service.

The issue occurs because per-I/O canceled flags can remain set for fetched I/Os if recovery stops before all I/Os in the queue are fetched, preventing outstanding commands from being completed during cancellation.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/0842186d2c4e67d2f8c8c2d1d779e8acffd41b5b
• https://git.kernel.org/stable/c/63335e5a67d89bb7cb9b023bbb3785896587a648