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.

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History

Tue, 24 Mar 2026 19:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Mon, 23 Mar 2026 19:30:00 +0000

Type Values Removed Values Added
First Time appeared Libfuse Project
Libfuse Project libfuse
CPEs cpe:2.3:a:libfuse_project:libfuse:*:*:*:*:*:*:*:*
Vendors & Products Libfuse Project
Libfuse Project libfuse

Mon, 23 Mar 2026 10:00:00 +0000

Type Values Removed Values Added
First Time appeared Libfuse
Libfuse libfuse
Vendors & Products Libfuse
Libfuse libfuse

Fri, 20 Mar 2026 20:45:00 +0000

Type Values Removed Values Added
Description 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.
Title Use After Free in libfuse
Weaknesses CWE-416
References
Metrics cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-03-24T18:53:19.720Z

Reserved: 2026-03-17T21:17:08.885Z

Link: CVE-2026-33150

cve-icon Vulnrichment

Updated: 2026-03-24T18:52:37.326Z

cve-icon NVD

Status : Analyzed

Published: 2026-03-20T21:17:15.410

Modified: 2026-03-23T19:16:14.717

Link: CVE-2026-33150

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-03-23T09:52:43Z

Weaknesses