Vulnerability Description
libfuse is the reference implementation of the Linux FUSE. From version 3.18.0 to before version 3.18.2, a NULL pointer dereference and memory leak in fuse_uring_init_queue allows a local user to crash the FUSE daemon or cause resource exhaustion. When numa_alloc_local fails during io_uring queue entry setup, the code proceeds with NULL pointers. When fuse_uring_register_queue fails, NUMA allocations are leaked and the function incorrectly returns success. Only the io_uring transport is affected; the traditional /dev/fuse path is not affected. PoC confirmed with AddressSanitizer/LeakSanitizer. This issue has been patched in version 3.18.2.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Libfuse Project | Libfuse | >= 3.18.0, < 3.18.2 |
Related Weaknesses (CWE)
References
- https://github.com/libfuse/libfuse/commit/7beb86c09b6ec5aab14dc25256ed8a5ad18554Patch
- https://github.com/libfuse/libfuse/releases/tag/fuse-3.18.2ProductRelease Notes
- https://github.com/libfuse/libfuse/security/advisories/GHSA-x669-v3mq-r358Vendor Advisory
FAQ
What is CVE-2026-33179?
CVE-2026-33179 is a vulnerability with a CVSS score of 5.5 (MEDIUM). libfuse is the reference implementation of the Linux FUSE. From version 3.18.0 to before version 3.18.2, a NULL pointer dereference and memory leak in fuse_uring_init_queue allows a local user to cras...
How severe is CVE-2026-33179?
CVE-2026-33179 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-33179?
Check the references section above for vendor advisories and patch information. Affected products include: Libfuse Project Libfuse.