NULL pointer dereference in libfuse - CVE-2026-33179
Published: April 25, 2026
Vulnerability identifier: #VU127890
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-33179
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to null pointer dereference in fuse_uring_init_queue when initializing io_uring queue entries after NUMA allocation failure. A local user can trigger allocation failure conditions to cause a denial of service.
Only the io_uring transport is affected; the traditional /dev/fuse path is not affected.
Affected software
libfuse
Gentoo Linux
sys-fs/fuse
Gentoo Linux
sys-fs/fuse
How to mitigate CVE-2026-33179
Install security update from vendor's website.
libfuse - update to 3.18.2
sys-fs/fuse - update to 3.18.1
sys-fs/fuse - update to 3.18.1