Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Libfuse Project | Libfuse | >= 3.18.0, < 3.18.2 |
Related Weaknesses (CWE)
References
- https://github.com/libfuse/libfuse/commit/49fcd891a58f622c098e2ca67d66086f7b2138Patch
- https://github.com/libfuse/libfuse/releases/tag/fuse-3.18.2ProductRelease Notes
- https://github.com/libfuse/libfuse/security/advisories/GHSA-qxv7-xrc2-qmfxVendor Advisory
FAQ
What is CVE-2026-33150?
CVE-2026-33150 is a vulnerability with a CVSS score of 7.8 (HIGH). 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 ...
How severe is CVE-2026-33150?
CVE-2026-33150 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-33150?
Check the references section above for vendor advisories and patch information. Affected products include: Libfuse Project Libfuse.