CVE-2026-90095

kernel: fuse: Fix the condition to enable over-io-uring

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Severity

Low

Red Hat Product Security

5.5

CVSS 3.1

Review impact separately from score.

Published · September 17, 2026

Updated · October 13, 2026

Description

A flaw was found in the Linux kernel's FUSE (Filesystem in Userspace) component. This vulnerability occurs when the FUSE_OVER_IO_URING flag is not correctly handled during the initialization of a FUSE connection. A local attacker or a malicious FUSE server could exploit this by sending IORING_OP_URING_CMD operations without the proper flag, leading to a deadlock state and causing a Denial of Service (DoS) for the system.

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-367 · Time-of-check Time-of-use (TOCTOU) Race Condition