CVE-2026-64266

A flaw was found in the Linux kernel's FUSE (Filesystem in Userspace) component. The fuse_ref_folio() function does not properly re-lock a request after unlocking it, which can lead to a use-after-free vulnerability. A local attacker could exploit this flaw to potentially execute arbitrary code or cause a denial of service.

This vulnerability is rated as Moderate because exploitation requires local system access and winning a race condition during concurrent FUSE request handling. While FUSE support is available in default Red Hat Enterprise Linux environments, an attacker must possess local execution privileges to interact with user-space file systems and induce the race. Successful exploitation could lead to a kernel crash resulting in a denial of service or potentially permit local privilege escalation.

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.