FKIE_CVE-2021-47195

Vulnerability from fkie_nvd - Published: 2024-04-10 19:15 - Updated: 2026-06-17 04:16
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: spi: fix use-after-free of the add_lock mutex Commit 6098475d4cb4 ("spi: Fix deadlock when adding SPI controllers on SPI buses") introduced a per-controller mutex. But mutex_unlock() of said lock is called after the controller is already freed: spi_unregister_controller(ctlr) -> put_device(&ctlr->dev) -> spi_controller_release(dev) -> mutex_unlock(&ctrl->add_lock) Move the put_device() after the mutex_unlock().
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/11eab327a2a8bd36c38afbff920ae1bd45588dd4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/37330f37f6666c7739a44b2b6b95b047ccdbed2dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/54c2c96eafcfd242e52e932ab54ace4784efe1dd
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6c53b45c71b4920b5e62f0ea8079a1da382b9434Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/37330f37f6666c7739a44b2b6b95b047ccdbed2dPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/6c53b45c71b4920b5e62f0ea8079a1da382b9434Patch
Impacted products
Vendor Product Version
linux linux_kernel *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/spi/spi.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "54c2c96eafcfd242e52e932ab54ace4784efe1dd",
              "status": "affected",
              "version": "aa3f3d7bef59583f2d3234173105a27ff61ef8fe",
              "versionType": "git"
            },
            {
              "lessThan": "11eab327a2a8bd36c38afbff920ae1bd45588dd4",
              "status": "affected",
              "version": "c8dce228db6f81dbc897a018dfc5c418e917cf64",
              "versionType": "git"
            },
            {
              "lessThan": "37330f37f6666c7739a44b2b6b95b047ccdbed2d",
              "status": "affected",
              "version": "6098475d4cb48d821bdf453c61118c56e26294f0",
              "versionType": "git"
            },
            {
              "lessThan": "6c53b45c71b4920b5e62f0ea8079a1da382b9434",
              "status": "affected",
              "version": "6098475d4cb48d821bdf453c61118c56e26294f0",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "722ef19a161ce3fffb3d1b01ce2301c306639bdd",
              "versionType": "git"
            },
            {
              "lessThan": "5.15",
              "status": "affected",
              "version": "5.14.15",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/spi/spi.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.15"
            },
            {
              "lessThan": "5.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.16",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "9E41D489-7457-4244-B477-AF077373C777",
              "versionEndExcluding": "5.15.5",
              "versionStartExcluding": "5.15.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nspi: fix use-after-free of the add_lock mutex\n\nCommit 6098475d4cb4 (\"spi: Fix deadlock when adding SPI controllers on\nSPI buses\") introduced a per-controller mutex. But mutex_unlock() of\nsaid lock is called after the controller is already freed:\n\n  spi_unregister_controller(ctlr)\n  -\u003e put_device(\u0026ctlr-\u003edev)\n    -\u003e spi_controller_release(dev)\n  -\u003e mutex_unlock(\u0026ctrl-\u003eadd_lock)\n\nMove the put_device() after the mutex_unlock()."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: spi: corrige el use-after-free del mutex add_lock. El commit 6098475d4cb4 (\"spi: corrige el punto muerto al agregar controladores SPI en buses SPI\") introdujo un mutex por controlador. Pero mutex_unlock() de dicho bloqueo se llama despu\u00e9s de que el controlador ya est\u00e1 liberado: spi_unregister_controller(ctlr) -\u0026gt; put_device(\u0026amp;ctlr-\u0026gt;dev) -\u0026gt; spi_controller_release(dev) -\u0026gt; mutex_unlock(\u0026amp;ctrl-\u0026gt;add_lock) Mueva put_device() despu\u00e9s el mutex_unlock()."
    }
  ],
  "id": "CVE-2021-47195",
  "lastModified": "2026-06-17T04:16:53.067",
  "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-2021-47195",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-04-10T19:52:25.727067Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2024-04-10T19:15:47.853",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/11eab327a2a8bd36c38afbff920ae1bd45588dd4"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/37330f37f6666c7739a44b2b6b95b047ccdbed2d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/54c2c96eafcfd242e52e932ab54ace4784efe1dd"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/6c53b45c71b4920b5e62f0ea8079a1da382b9434"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/37330f37f6666c7739a44b2b6b95b047ccdbed2d"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/6c53b45c71b4920b5e62f0ea8079a1da382b9434"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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