CVE-2026-33179

MEDIUM

5.5

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.

CVE Details

CVSS v3.1 Score5.5

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack VectorLOCAL

ComplexityLOW

Privileges RequiredLOW

User InteractionNONE

Published3/20/2026

Last Modified3/27/2026

Sourcenvd

Honeypot Sightings0

Affected Products

libfuse_project:libfuse

Weaknesses (CWE)

CWE-476

References

https://github.com/libfuse/libfuse/commit/7beb86c09b6ec5aab14dc25256ed8a5ad18554d7(security-advisories@github.com)

https://github.com/libfuse/libfuse/releases/tag/fuse-3.18.2(security-advisories@github.com)

https://github.com/libfuse/libfuse/security/advisories/GHSA-x669-v3mq-r358(security-advisories@github.com)

IOC Correlations

No correlations recorded

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