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CVE-2021-47195 (GCVE-0-2021-47195)

Vulnerability from cvelistv5 – Published: 2024-04-10 18:56 – Updated: 2026-05-23 15:19
VLAI
Title
spi: fix use-after-free of the add_lock mutex
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().
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-04-10 19:52 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: aa3f3d7bef59583f2d3234173105a27ff61ef8fe , < 54c2c96eafcfd242e52e932ab54ace4784efe1dd (git)
Affected: c8dce228db6f81dbc897a018dfc5c418e917cf64 , < 11eab327a2a8bd36c38afbff920ae1bd45588dd4 (git)
Affected: 6098475d4cb48d821bdf453c61118c56e26294f0 , < 37330f37f6666c7739a44b2b6b95b047ccdbed2d (git)
Affected: 6098475d4cb48d821bdf453c61118c56e26294f0 , < 6c53b45c71b4920b5e62f0ea8079a1da382b9434 (git)
Affected: 722ef19a161ce3fffb3d1b01ce2301c306639bdd (git)
Affected: 5.14.15 , < 5.15 (semver)
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Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 5.15.5 , ≤ 5.15.* (semver)
Unaffected: 5.16 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/37330f37f6666c7739a44b2b6b95b047ccdbed2d\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/6c53b45c71b4920b5e62f0ea8079a1da382b9434\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-04T05:32:07.110Z\"}}, {\"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-47195\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-04-10T19:52:25.727067Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-05-23T19:01:23.150Z\"}, \"title\": \"CISA ADP Vulnrichment\"}], \"cna\": {\"title\": \"spi: fix use-after-free of the add_lock mutex\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"aa3f3d7bef59583f2d3234173105a27ff61ef8fe\", \"lessThan\": \"54c2c96eafcfd242e52e932ab54ace4784efe1dd\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c8dce228db6f81dbc897a018dfc5c418e917cf64\", \"lessThan\": \"11eab327a2a8bd36c38afbff920ae1bd45588dd4\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6098475d4cb48d821bdf453c61118c56e26294f0\", \"lessThan\": \"37330f37f6666c7739a44b2b6b95b047ccdbed2d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6098475d4cb48d821bdf453c61118c56e26294f0\", \"lessThan\": \"6c53b45c71b4920b5e62f0ea8079a1da382b9434\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"722ef19a161ce3fffb3d1b01ce2301c306639bdd\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5.14.15\", \"lessThan\": \"5.15\", \"versionType\": \"semver\"}], \"programFiles\": [\"drivers/spi/spi.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.15\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.15\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.15.5\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"5.16\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/spi/spi.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/54c2c96eafcfd242e52e932ab54ace4784efe1dd\"}, {\"url\": \"https://git.kernel.org/stable/c/11eab327a2a8bd36c38afbff920ae1bd45588dd4\"}, {\"url\": \"https://git.kernel.org/stable/c/37330f37f6666c7739a44b2b6b95b047ccdbed2d\"}, {\"url\": \"https://git.kernel.org/stable/c/6c53b45c71b4920b5e62f0ea8079a1da382b9434\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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().\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.5\", \"versionStartIncluding\": \"5.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.16\", \"versionStartIncluding\": \"5.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.14.15\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-23T15:19:30.977Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47195\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-23T15:19:30.977Z\", \"dateReserved\": \"2024-03-25T09:12:14.114Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-04-10T18:56:31.999Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.