CVE-2025-68821

kernel: Linux kernel FUSE: Denial of Service via readahead reclaim deadlock

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Severity

Moderate

Red Hat Product Security

5.5

CVSS 3.1

Review impact separately from score.

Published · January 13, 2026

Updated · June 28, 2026

Description

A flaw was found in the Linux kernel's Filesystem in Userspace (FUSE) subsystem. This vulnerability allows a local attacker to cause a system-wide deadlock. The flaw occurs due to incorrect handling of inode references during readahead operations when the FUSE server does not implement the open function. This can lead to a Denial of Service (DoS) as the system becomes unresponsive.

CVSS score applicability

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

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 5.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE-833 · Deadlock