FKIE_CVE-2026-33179

Vulnerability from fkie_nvd - Published: 2026-03-20 21:17 - Updated: 2026-03-27 21:20
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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.
References
security-advisories@github.comhttps://github.com/libfuse/libfuse/commit/7beb86c09b6ec5aab14dc25256ed8a5ad18554d7Patch
security-advisories@github.comhttps://github.com/libfuse/libfuse/releases/tag/fuse-3.18.2Product, Release Notes
security-advisories@github.comhttps://github.com/libfuse/libfuse/security/advisories/GHSA-x669-v3mq-r358Vendor Advisory
Impacted products
Vendor Product Version
libfuse_project libfuse *
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:libfuse_project:libfuse:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "83EF6E3E-F5F2-4CE2-B497-62493DAB2A1F",
              "versionEndExcluding": "3.18.2",
              "versionStartIncluding": "3.18.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    },
    {
      "lang": "es",
      "value": "libfuse es la implementaci\u00f3n de referencia de FUSE de Linux. Desde la versi\u00f3n 3.18.0 hasta antes de la versi\u00f3n 3.18.2, una desreferencia de puntero NULL y una fuga de memoria en fuse_uring_init_queue permiten a un usuario local bloquear el demonio FUSE o causar agotamiento de recursos. Cuando numa_alloc_local falla durante la configuraci\u00f3n de la entrada de la cola io_uring, el c\u00f3digo procede con punteros NULL. Cuando fuse_uring_register_queue falla, las asignaciones NUMA se filtran y la funci\u00f3n devuelve \u00e9xito incorrectamente. Solo el transporte io_uring se ve afectado; la ruta tradicional /dev/fuse no se ve afectada. PoC confirmado con AddressSanitizer/LeakSanitizer. Este problema ha sido parcheado en la versi\u00f3n 3.18.2."
    }
  ],
  "id": "CVE-2026-33179",
  "lastModified": "2026-03-27T21:20:47.880",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-03-20T21:17:16.593",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/libfuse/libfuse/commit/7beb86c09b6ec5aab14dc25256ed8a5ad18554d7"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Product",
        "Release Notes"
      ],
      "url": "https://github.com/libfuse/libfuse/releases/tag/fuse-3.18.2"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://github.com/libfuse/libfuse/security/advisories/GHSA-x669-v3mq-r358"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}


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