CVE-2026-53388

A flaw was found in the Linux kernel's Filesystem in Userspace (FUSE) component. The fuse_try_move_folio() function, responsible for managing page cache folios, fails to re-lock a request after initially unlocking it on a successful path. This oversight allows another function, fuse_chan_abort(), to prematurely free critical input/output arguments (fuse_io_args). Consequently, subsequent operations attempting to access these freed arguments can lead to a use-after-free vulnerability, potentially allowing an attacker to cause a system crash or execute arbitrary code.

This vulnerability is rated as having Moderate impact for Red Hat Enterprise Linux because exploitation requires local access and relies on winning a race condition during concurrent abort operations on user-space filesystem requests. An unprivileged local user must have permissions to interact with or mount a FUSE filesystem to initiate the conflicting input/output transactions. Successful exploitation could destabilize kernel memory, resulting in a system crash or potential 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.