CVE-2026-90391

A flaw was found in the Linux kernel. A local user could exploit a vulnerability in the dmirror_fault() function. When a mirrored memory management (mm) structure has exited, dmirror_fault() incorrectly returns a success code, causing the caller to enter an infinite retry loop. This can lead to a Denial of Service (DoS) condition, making the system unresponsive.

This flaw is rated with a Low severity because it is confined to a kernel test driver that is not utilized during standard production operations. To trigger the condition, a local attacker requires access to the test driver interface during process termination, potentially causing an endless loop that impacts availability. Standard Red Hat Enterprise Linux deployments do not load or expose this test module by default, significantly limiting real-world exposure.

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.