cve-2021-47195
Vulnerability from cvelistv5
Published
2024-04-10 18:56
Modified
2024-11-17 15:02
Severity ?
Summary
spi: fix use-after-free of the add_lock mutex
Impacted products
Vendor Product Version
Linux Linux Version: 5.15
Show details on NVD website


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                "id": "CVE-2021-47195",
                "options": [
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                    "Exploitation": "none"
                  },
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                    "Automatable": "no"
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                    "Technical Impact": "partial"
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                "role": "CISA Coordinator",
                "timestamp": "2024-04-10T19:52:25.727067Z",
                "version": "2.0.3"
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    "cna": {
      "affected": [
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          "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": [
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      "descriptions": [
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          "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()."
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      "title": "spi: fix use-after-free of the add_lock mutex",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47195",
    "datePublished": "2024-04-10T18:56:31.999Z",
    "dateReserved": "2024-03-25T09:12:14.114Z",
    "dateUpdated": "2024-11-17T15:02:33.886Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47195\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-04-10T19:15:47.853\",\"lastModified\":\"2024-11-17T15:15:17.087\",\"vulnStatus\":\"Modified\",\"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().\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartExcluding\":\"5.15.0\",\"versionEndExcluding\":\"5.15.5\",\"matchCriteriaId\":\"9E41D489-7457-4244-B477-AF077373C777\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/11eab327a2a8bd36c38afbff920ae1bd45588dd4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/37330f37f6666c7739a44b2b6b95b047ccdbed2d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/54c2c96eafcfd242e52e932ab54ace4784efe1dd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6c53b45c71b4920b5e62f0ea8079a1da382b9434\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
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