CVE-2026-33179

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.

Database specific

{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-476"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33179.json"
}

References

Affected packages

Git / github.com/libfuse/libfuse

Affected ranges

Type

GIT

Repo

https://github.com/libfuse/libfuse

Events

Introduced

9157d99f17384f362c65b02cec065e0aec5f0b56

Fixed

033844748010a3b8265bf1c90b9ae8ffe4cd9ca7

Fixed

7beb86c09b6ec5aab14dc25256ed8a5ad18554d7

Database specific

Show details

{
    "cpe": "cpe:2.3:a:libfuse_project:libfuse:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "3.18.0"
        },
        {
            "fixed": "3.18.2"
        }
    ],
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ]
}

Affected versions

fuse-3.*

fuse-3.18.0

fuse-3.18.1

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33179.json"

vanir_signatures

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        "deprecated": false,
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            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-33179-61d3e087",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/libfuse/libfuse/commit/7beb86c09b6ec5aab14dc25256ed8a5ad18554d7",
        "target": {
            "file": "lib/fuse_uring.c"
        }
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        "deprecated": false,
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        "signature_version": "v1",
        "source": "https://github.com/libfuse/libfuse/commit/7beb86c09b6ec5aab14dc25256ed8a5ad18554d7",
        "target": {
            "file": "lib/fuse_uring.c",
            "function": "fuse_uring_init_queue"
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]

vanir_signatures_modified

"2026-08-12T16:24:59Z"