CVE-2025-22068

A flaw was found in the Linux kernel's Userspace Block Device (ublk) driver. A local user with access to the driver can trigger a use-after-free condition—where memory is accessed after being freed—when a request queue is frozen during command cancellation. This issue could allow an attacker to cause a denial of service (DoS) by crashing the system or potentially escalate privileges.

Red Hat Enterprise Linux and Fedora not affected (all versions). For triggering the bug user needs to have access to the kind of ioctl requests for the ublk driver.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.