NULL Pointer Dereference Affecting fuse3 package, versions <3.18.2-1


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.17% (7th percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk IDSNYK-DEBIANUNSTABLE-FUSE3-15759213
  • published23 Mar 2026
  • disclosed20 Mar 2026

Introduced: 20 Mar 2026

CVE-2026-33179  (opens in a new tab)
CWE-476  (opens in a new tab)

How to fix?

Upgrade Debian:unstable fuse3 to version 3.18.2-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream fuse3 package and not the fuse3 package as distributed by Debian. See How to fix? for Debian:unstable relevant fixed versions and status.

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 Base Scores

version 3.1