Review reviewHigh

CVE-2026-33150

libfuse libfuse, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8

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 l...

CVSS: 7.8
EPSS: 0.31%
CISA KEV: Not listed
Published: 2026.03.21

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.31%

Technical severityCVSS 7.8

Vulnerability overview

Affected product and versions

Product: libfuse libfuse, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8
Affected versions: >= >= 3.18.0, < 3.18.2, >= 3.18.0 < 3.18.2
Fixed versions: 3.18.2

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that libfuse libfuse, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8 and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE: CWE-416, CWE-825