GSD-2021-47195

Vulnerability from gsd - Updated: 2024-04-03 05:03
Details
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().
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{
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-47195"
      ],
      "details": "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().",
      "id": "GSD-2021-47195",
      "modified": "2024-04-03T05:03:54.912656Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
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        "ID": "CVE-2021-47195",
        "STATE": "PUBLIC"
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      "affects": {
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                    "version": {
                      "version_data": [
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                          "version_affected": "\u003c",
                          "version_name": "6098475d4cb4",
                          "version_value": "37330f37f666"
                        },
                        {
                          "version_value": "not down converted",
                          "x_cve_json_5_version_data": {
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                                "version": "5.15"
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                                "version": "0",
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                                "version": "5.15.5",
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                              {
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                                "status": "unaffected",
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      "data_version": "4.0",
      "description": {
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            "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()."
          }
        ]
      },
      "generator": {
        "engine": "bippy-d175d3acf727"
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "lang": "eng",
                "value": "n/a"
              }
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          }
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      },
      "references": {
        "reference_data": [
          {
            "name": "https://git.kernel.org/stable/c/37330f37f6666c7739a44b2b6b95b047ccdbed2d",
            "refsource": "MISC",
            "url": "https://git.kernel.org/stable/c/37330f37f6666c7739a44b2b6b95b047ccdbed2d"
          },
          {
            "name": "https://git.kernel.org/stable/c/6c53b45c71b4920b5e62f0ea8079a1da382b9434",
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                    "versionEndExcluding": "5.15.5",
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                "negate": false,
                "operator": "OR"
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        ],
        "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()."
          }
        ],
        "id": "CVE-2021-47195",
        "lastModified": "2024-04-19T19:16:08.537",
        "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"
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              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
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        "published": "2024-04-10T19:15:47.853",
        "references": [
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
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                "value": "CWE-416"
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            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    }
  }
}



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