FKIE_CVE-2021-47305

Vulnerability from fkie_nvd - Published: 2024-05-21 15:15 - Updated: 2026-06-17 04:17
Severity
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: dma-buf/sync_file: Don't leak fences on merge failure Each add_fence() call does a dma_fence_get() on the relevant fence. In the error path, we weren't calling dma_fence_put() so all those fences got leaked. Also, in the krealloc_array failure case, we weren't freeing the fences array. Instead, ensure that i and fences are always zero-initialized and dma_fence_put() all the fences and kfree(fences) on every error path.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0d514185ae792d3a1903c8e1a83899aa996705cePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/19edcd97727aae9362444a859a24d99a8730cb27Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/19f51c2529339280d2c8c6427cd3e21ddf1ac3f8Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/41f45e91c92c8480242ea448d54e28c753b13902Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e0355a0ad31a1d677b2a4514206de4902bd550e8Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ffe000217c5068c5da07ccb1c0f8cce7ad767435Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/0d514185ae792d3a1903c8e1a83899aa996705cePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/19edcd97727aae9362444a859a24d99a8730cb27Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/19f51c2529339280d2c8c6427cd3e21ddf1ac3f8Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/41f45e91c92c8480242ea448d54e28c753b13902Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e0355a0ad31a1d677b2a4514206de4902bd550e8Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/ffe000217c5068c5da07ccb1c0f8cce7ad767435Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 5.14
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/dma-buf/sync_file.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "19f51c2529339280d2c8c6427cd3e21ddf1ac3f8",
              "status": "affected",
              "version": "a02b9dc90d844cc7df7b63264e7920cc425052d9",
              "versionType": "git"
            },
            {
              "lessThan": "e0355a0ad31a1d677b2a4514206de4902bd550e8",
              "status": "affected",
              "version": "a02b9dc90d844cc7df7b63264e7920cc425052d9",
              "versionType": "git"
            },
            {
              "lessThan": "41f45e91c92c8480242ea448d54e28c753b13902",
              "status": "affected",
              "version": "a02b9dc90d844cc7df7b63264e7920cc425052d9",
              "versionType": "git"
            },
            {
              "lessThan": "0d514185ae792d3a1903c8e1a83899aa996705ce",
              "status": "affected",
              "version": "a02b9dc90d844cc7df7b63264e7920cc425052d9",
              "versionType": "git"
            },
            {
              "lessThan": "19edcd97727aae9362444a859a24d99a8730cb27",
              "status": "affected",
              "version": "a02b9dc90d844cc7df7b63264e7920cc425052d9",
              "versionType": "git"
            },
            {
              "lessThan": "ffe000217c5068c5da07ccb1c0f8cce7ad767435",
              "status": "affected",
              "version": "a02b9dc90d844cc7df7b63264e7920cc425052d9",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/dma-buf/sync_file.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.9"
            },
            {
              "lessThan": "4.9",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.14.*",
              "status": "unaffected",
              "version": "4.14.241",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.199",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.135",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.13.*",
              "status": "unaffected",
              "version": "5.13.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.14",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "A5E7A8DD-98C2-4C78-A535-5E3305CABAB7",
              "versionEndExcluding": "4.14.241",
              "versionStartIncluding": "4.9",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "D1C5B0E1-06E7-4615-AA17-02585202D86E",
              "versionEndExcluding": "4.19.199",
              "versionStartIncluding": "4.15",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "3EF7BA79-262D-4A55-A0A1-E0D0BCA7C320",
              "versionEndExcluding": "5.4.135",
              "versionStartIncluding": "4.20",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "08E2D438-D50E-43C5-AF10-D62FE49B5815",
              "versionEndExcluding": "5.10.53",
              "versionStartIncluding": "5.5",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "808DF8D9-4913-4CC7-B91F-B4146556B7ED",
              "versionEndExcluding": "5.13.5",
              "versionStartIncluding": "5.11",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:5.14:rc1:*:*:*:*:*:*",
              "matchCriteriaId": "71268287-21A8-4488-AA4F-23C473153131",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndma-buf/sync_file: Don\u0027t leak fences on merge failure\n\nEach add_fence() call does a dma_fence_get() on the relevant fence.  In\nthe error path, we weren\u0027t calling dma_fence_put() so all those fences\ngot leaked.  Also, in the krealloc_array failure case, we weren\u0027t\nfreeing the fences array.  Instead, ensure that i and fences are always\nzero-initialized and dma_fence_put() all the fences and kfree(fences) on\nevery error path."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: dma-buf/sync_file: no filtrar barreras en caso de falla de fusi\u00f3n. Cada llamada a add_fence() realiza un dma_fence_get() en la barrera relevante. En la ruta del error, no est\u00e1bamos llamando a dma_fence_put() por lo que se filtraron todas esas barreras. Adem\u00e1s, en el caso de falla de krealloc_array, no est\u00e1bamos liberando la matriz de vallas. En su lugar, aseg\u00farese de que i y las vallas est\u00e9n siempre inicializadas en cero y dma_fence_put() todas las vallas y kfree(fences) en cada ruta de error."
    }
  ],
  "id": "CVE-2021-47305",
  "lastModified": "2026-06-17T04:17:09.110",
  "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": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2021-47305",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-06-17T17:37:39.251165Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2024-05-21T15:15:18.177",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/0d514185ae792d3a1903c8e1a83899aa996705ce"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/19edcd97727aae9362444a859a24d99a8730cb27"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/19f51c2529339280d2c8c6427cd3e21ddf1ac3f8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/41f45e91c92c8480242ea448d54e28c753b13902"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/e0355a0ad31a1d677b2a4514206de4902bd550e8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/ffe000217c5068c5da07ccb1c0f8cce7ad767435"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/0d514185ae792d3a1903c8e1a83899aa996705ce"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/19edcd97727aae9362444a859a24d99a8730cb27"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/19f51c2529339280d2c8c6427cd3e21ddf1ac3f8"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/41f45e91c92c8480242ea448d54e28c753b13902"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/e0355a0ad31a1d677b2a4514206de4902bd550e8"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/ffe000217c5068c5da07ccb1c0f8cce7ad767435"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-617"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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