TI-2026-25608 Aliases CVE-2026-33179

libfuse: NULL Pointer Dereference and Memory Leak in io_uring Queue Initialization

LOW 24CWE-476Published 2026-03-20 · Updated 2026-03-25

Key facts

Attack vector: Local
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Partial Red Hat: 2 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-476.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00204 10th percentileScored 2026-11-07

Fix Partial libfuse (libfuse): 3.18.2Red Hat: 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
libfuse	libfuse	3.18.0 to before 3.18.2	3.18.2	Patch available	CNA

libfuse Vendorlibfuse Affected 3.18.0 to before 3.18.2 Fixed in 3.18.2 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:libfuse_project:libfuse::::::::	3.18.0 to before 3.18.2	Vulnerable	Libfuse Project

cpe:2.3:a:libfuse_project:libfuse:*:*:*:*:*:*:*:* Versions 3.18.0 to before 3.18.2 Vulnerable ·Libfuse Project

Remediation

Fix · CNA libfuse (libfuse) Fixed in 3.18.2

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Enterprise Linux 7	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 8	Affected	No fix yet: Fix deferred

Timeline

2026-10-02 Threatist record created from CVE-2026-33179

References

TI-2026-34775 SSHFS Symlink Escape: Rogue SFTP Server → Local File Read/Write CVSS 3.1CRITICAL 9.3
TI-2026-35992 SSHFS: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection') CVSS 3.1HIGH 7.0

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences