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CVE-2021-47477 (GCVE-0-2021-47477)

Vulnerability from cvelistv5 – Published: 2024-05-22 08:19 – Updated: 2026-05-11 13:55
VLAI
Title
comedi: dt9812: fix DMA buffers on stack
Summary
In the Linux kernel, the following vulnerability has been resolved: comedi: dt9812: fix DMA buffers on stack USB transfer buffers are typically mapped for DMA and must not be allocated on the stack or transfers will fail. Allocate proper transfer buffers in the various command helpers and return an error on short transfers instead of acting on random stack data. Note that this also fixes a stack info leak on systems where DMA is not used as 32 bytes are always sent to the device regardless of how short the command is.
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-05-22 15:50 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 63274cd7d38a3322d90b66a5bc976de1fb899051 , < a6af69768d5cb4b2528946d53be5fa19ade37723 (git)
Affected: 63274cd7d38a3322d90b66a5bc976de1fb899051 , < 365a346cda82f51d835c49136a00a9df8a78c7f2 (git)
Affected: 63274cd7d38a3322d90b66a5bc976de1fb899051 , < 8a52bc480992c7c9da3ebfea456af731f50a4b97 (git)
Affected: 63274cd7d38a3322d90b66a5bc976de1fb899051 , < 39ea61037ae78f14fa121228dd962ea3280eacf3 (git)
Affected: 63274cd7d38a3322d90b66a5bc976de1fb899051 , < 3efb7af8ac437085b6c776e5b54830b149d86efe (git)
Affected: 63274cd7d38a3322d90b66a5bc976de1fb899051 , < 786f5b03450454557ff858a8bead5d7c0cbf78d6 (git)
Affected: 63274cd7d38a3322d90b66a5bc976de1fb899051 , < 3ac273d154d634e2034508a14db82a95d7ad12ed (git)
Affected: 63274cd7d38a3322d90b66a5bc976de1fb899051 , < 20cebb8b620dc987e55ddc46801de986e081757e (git)
Affected: 63274cd7d38a3322d90b66a5bc976de1fb899051 , < 536de747bc48262225889a533db6650731ab25d3 (git)
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Linux Linux Affected: 2.6.29
Unaffected: 0 , < 2.6.29 (semver)
Unaffected: 4.4.292 , ≤ 4.4.* (semver)
Unaffected: 4.9.290 , ≤ 4.9.* (semver)
Unaffected: 4.14.255 , ≤ 4.14.* (semver)
Unaffected: 4.19.217 , ≤ 4.19.* (semver)
Unaffected: 5.4.159 , ≤ 5.4.* (semver)
Unaffected: 5.10.79 , ≤ 5.10.* (semver)
Unaffected: 5.14.18 , ≤ 5.14.* (semver)
Unaffected: 5.15.2 , ≤ 5.15.* (semver)
Unaffected: 5.16 , ≤ * (original_commit_for_fix)
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Asigne b\u00faferes de transferencia adecuados en los distintos asistentes de comando y devuelva un error en transferencias cortas en lugar de actuar sobre datos de pila aleatorios. Tenga en cuenta que esto tambi\u00e9n soluciona una fuga de informaci\u00f3n de la pila en sistemas donde no se usa DMA, ya que siempre se env\u00edan 32 bytes al dispositivo, independientemente de cu\u00e1n corto sea el 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    "redhat_vex": {
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      "current_release_date": "2025-11-21T10:51:55+00:00",
      "cve": "CVE-2021-47477",
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      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: comedi: dt9812: fix DMA buffers on stack",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47477.json",
      "version": "3"
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    "suse_vex": {
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      "initial_release_date": "2024-05-23T03:04:32Z",
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      "product_status:known_not_affected": "266",
      "product_status:recommended": "452",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-47477",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-47477.json",
      "version": "51"
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\"https://git.kernel.org/stable/c/365a346cda82f51d835c49136a00a9df8a78c7f2\"}, {\"url\": \"https://git.kernel.org/stable/c/8a52bc480992c7c9da3ebfea456af731f50a4b97\"}, {\"url\": \"https://git.kernel.org/stable/c/39ea61037ae78f14fa121228dd962ea3280eacf3\"}, {\"url\": \"https://git.kernel.org/stable/c/3efb7af8ac437085b6c776e5b54830b149d86efe\"}, {\"url\": \"https://git.kernel.org/stable/c/786f5b03450454557ff858a8bead5d7c0cbf78d6\"}, {\"url\": \"https://git.kernel.org/stable/c/3ac273d154d634e2034508a14db82a95d7ad12ed\"}, {\"url\": \"https://git.kernel.org/stable/c/20cebb8b620dc987e55ddc46801de986e081757e\"}, {\"url\": \"https://git.kernel.org/stable/c/536de747bc48262225889a533db6650731ab25d3\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\ncomedi: dt9812: fix DMA buffers on stack\\n\\nUSB transfer buffers are typically mapped for DMA and must not be\\nallocated on the stack or transfers will fail.\\n\\nAllocate proper transfer buffers in the various command helpers and\\nreturn an error on short transfers instead of acting on random stack\\ndata.\\n\\nNote that this also fixes a stack info leak on systems where DMA is not\\nused as 32 bytes are always sent to the device regardless of how short\\nthe command is.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.4.292\", \"versionStartIncluding\": \"2.6.29\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.9.290\", \"versionStartIncluding\": \"2.6.29\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.255\", \"versionStartIncluding\": \"2.6.29\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.217\", \"versionStartIncluding\": \"2.6.29\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.159\", \"versionStartIncluding\": \"2.6.29\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.79\", \"versionStartIncluding\": \"2.6.29\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.14.18\", \"versionStartIncluding\": \"2.6.29\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.2\", \"versionStartIncluding\": \"2.6.29\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.16\", \"versionStartIncluding\": \"2.6.29\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T07:11:51.469Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47477\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T07:11:51.469Z\", \"dateReserved\": \"2024-05-22T06:20:56.200Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-22T08:19:30.860Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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Tags
Taxonomy of the tags.





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.