CVE-2026-33179
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.
How to fix
- libfuse_project libfuse3.18.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| libfuse_project libfuse | 3.18.0 ≤ v < 3.18.2 | 3.18.2 |
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