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CVE-2026-33150

7.8 · HIGH

libfuse is the reference implementation of the Linux FUSE.

Published Mar 20, 2026CWE-416EPSS 0.20%

Overview

CVE-2026-33150 is a high-severity vulnerability. It was published on March 20, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/libfuse/libfuse/commit/49fcd891a58f622c098e2ca67d66086f7b213836GitHubgithub.com/libfuse/libfuse/releases/tag/fuse-3.18.2GitHubgithub.com/libfuse/libfuse/security/advisories/GHSA-qxv7-xrc2-qmfxRefaccess.redhat.com/security/cve/CVE-2026-33150Refbugzilla.redhat.com/show_bug.cgi?id=2449771Refsecurity.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33150.json

How CyberStrike helps

Frequently asked questions

What is CVE-2026-33150?

CVE-2026-33150 is a high-severity vulnerability. It was published on March 20, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-33150?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-33150?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-33150?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-33150 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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