Use After Free Affecting fuse3 package, versions <3.18.2-1


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.31% (23rd percentile)

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  • Snyk IDSNYK-DEBIAN14-FUSE3-15759227
  • published23 Mar 2026
  • disclosed20 Mar 2026

Introduced: 20 Mar 2026

CVE-2026-33150  (opens in a new tab)
CWE-416  (opens in a new tab)

How to fix?

Upgrade Debian:14 fuse3 to version 3.18.2-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream fuse3 package and not the fuse3 package as distributed by Debian. See How to fix? for Debian:14 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1