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CVE-2021-47364 (GCVE-0-2021-47364)

Vulnerability from cvelistv5 – Published: 2024-05-21 15:03 – Updated: 2026-05-11 13:53
VLAI
Title
comedi: Fix memory leak in compat_insnlist()
Summary
In the Linux kernel, the following vulnerability has been resolved: comedi: Fix memory leak in compat_insnlist() `compat_insnlist()` handles the 32-bit version of the `COMEDI_INSNLIST` ioctl (whenwhen `CONFIG_COMPAT` is enabled). It allocates memory to temporarily hold an array of `struct comedi_insn` converted from the 32-bit version in user space. This memory is only being freed if there is a fault while filling the array, otherwise it is leaked. Add a call to `kfree()` to fix the leak.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-05-23 18:02 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b8d47d8813055ce38c0d2ad913d5462017e52692 , < 8d6a21e4cd6a319b0662cbe4ad6199e276ac776a (git)
Affected: b8d47d8813055ce38c0d2ad913d5462017e52692 , < f217b6c1e28ed0b353634ce4d92a155b80bd1671 (git)
Affected: b8d47d8813055ce38c0d2ad913d5462017e52692 , < bb509a6ffed2c8b0950f637ab5779aa818ed1596 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.8
Unaffected: 0 , < 5.8 (semver)
Unaffected: 5.10.70 , ≤ 5.10.* (semver)
Unaffected: 5.14.9 , ≤ 5.14.* (semver)
Unaffected: 5.15 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/8d6a21e4cd6a319b0662cbe4ad6199e276ac776a\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/f217b6c1e28ed0b353634ce4d92a155b80bd1671\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/bb509a6ffed2c8b0950f637ab5779aa818ed1596\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-04T05:32:08.649Z\"}}, {\"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-47364\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-05-23T18:02:02.368572Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-05-23T18:02:06.627Z\"}, \"title\": \"CISA ADP Vulnrichment\"}], \"cna\": {\"title\": \"comedi: Fix memory leak in compat_insnlist()\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"b8d47d8813055ce38c0d2ad913d5462017e52692\", \"lessThan\": \"8d6a21e4cd6a319b0662cbe4ad6199e276ac776a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b8d47d8813055ce38c0d2ad913d5462017e52692\", \"lessThan\": \"f217b6c1e28ed0b353634ce4d92a155b80bd1671\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b8d47d8813055ce38c0d2ad913d5462017e52692\", \"lessThan\": \"bb509a6ffed2c8b0950f637ab5779aa818ed1596\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/comedi/comedi_fops.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.8\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.8\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.70\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.14.9\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.14.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/comedi/comedi_fops.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/8d6a21e4cd6a319b0662cbe4ad6199e276ac776a\"}, {\"url\": \"https://git.kernel.org/stable/c/f217b6c1e28ed0b353634ce4d92a155b80bd1671\"}, {\"url\": \"https://git.kernel.org/stable/c/bb509a6ffed2c8b0950f637ab5779aa818ed1596\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\ncomedi: Fix memory leak in compat_insnlist()\\n\\n`compat_insnlist()` handles the 32-bit version of the `COMEDI_INSNLIST`\\nioctl (whenwhen `CONFIG_COMPAT` is enabled).  It allocates memory to\\ntemporarily hold an array of `struct comedi_insn` converted from the\\n32-bit version in user space.  This memory is only being freed if there\\nis a fault while filling the array, otherwise it is leaked.\\n\\nAdd a call to `kfree()` to fix the leak.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.70\", \"versionStartIncluding\": \"5.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.14.9\", \"versionStartIncluding\": \"5.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15\", \"versionStartIncluding\": \"5.8\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T07:09:25.272Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47364\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T07:09:25.272Z\", \"dateReserved\": \"2024-05-21T14:58:30.809Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T15:03:31.852Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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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.