PT-2026-26675 · Libfuse · Libfuse

Published 2026-03-20 · Updated 2026-03-20 · CVE-2026-33150

NVD

CVSS v3.1

7.8

High

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

libfuse is the reference implementation of the Linux FUSE. From version 3.18.0 to before version 3.18.2, a use-after-free vulnerability in the io uring subsystem of libfuse allows a local attacker to crash FUSE filesystem processes and potentially execute arbitrary code. When io uring thread creation fails due to resource exhaustion (e.g., cgroup pids.max), fuse uring start() frees the ring pool structure but stores the dangling pointer in the session state, leading to a use-after-free when the session shuts down. The trigger is reliable in containerized environments where cgroup pids.max limits naturally constrain thread creation. This issue has been patched in version 3.18.2.

Fix

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

CVE-2026-33150

Affected Products

Libfuse

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-33150 · Security Note
• https://github.com/libfuse/libfuse/releases/tag/fuse-3.18.2 · Note
• https://github.com/libfuse/libfuse/commit/49fcd891a58f622c098e2ca67d66086f7b213836 · Note
• https://github.com/libfuse/libfuse/security/advisories/GHSA-qxv7-xrc2-qmfx · Note