UBUNTU-CVE-2026-33179

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Source
https://ubuntu.com/security/CVE-2026-33179
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33179.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-33179
Upstream
Withdrawn
2026-07-28T18:33:22Z
Published
2026-03-20T21:17:00Z
Modified
2026-07-28T21:28:01Z
Severity
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

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.

References

Affected packages

Ubuntu:26.04:LTS / fuse3

Package

Name
fuse3
Purl
pkg:deb/ubuntu/fuse3?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

3.*
3.17.4-1
3.18.1-1
3.18.2-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "fuse",
            "binary_version": "3.18.2-1"
        },
        {
            "binary_name": "fuse3",
            "binary_version": "3.18.2-1"
        },
        {
            "binary_name": "libfuse3-4",
            "binary_version": "3.18.2-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33179.json"