CVE-2021-47170 (GCVE-0-2021-47170)

Vulnerability from cvelistv5 – Published: 2024-03-25 09:16 – Updated: 2026-05-11 13:49
VLAI
Title
USB: usbfs: Don't WARN about excessively large memory allocations
Summary
In the Linux kernel, the following vulnerability has been resolved: USB: usbfs: Don't WARN about excessively large memory allocations Syzbot found that the kernel generates a WARNing if the user tries to submit a bulk transfer through usbfs with a buffer that is way too large. This isn't a bug in the kernel; it's merely an invalid request from the user and the usbfs code does handle it correctly. In theory the same thing can happen with async transfers, or with the packet descriptor table for isochronous transfers. To prevent the MM subsystem from complaining about these bad allocation requests, add the __GFP_NOWARN flag to the kmalloc calls for these buffers.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: add1aaeabe6b08ed26381a2a06e505b2f09c3ba5 , < 2ab21d6e1411999b5fb43434f421f00bf50002eb (git)
Affected: add1aaeabe6b08ed26381a2a06e505b2f09c3ba5 , < 2c835fede13e03f2743a333e4370b5ed2db91e83 (git)
Affected: add1aaeabe6b08ed26381a2a06e505b2f09c3ba5 , < 8d83f109e920d2776991fa142bb904d985dca2ed (git)
Affected: add1aaeabe6b08ed26381a2a06e505b2f09c3ba5 , < 9f7cb3f01a10d9064cf13b3d26fb7e7a5827d098 (git)
Affected: add1aaeabe6b08ed26381a2a06e505b2f09c3ba5 , < 4f2629ea67e7225c3fd292c7fe4f5b3c9d6392de (git)
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Linux Linux Affected: 3.3
Unaffected: 0 , < 3.3 (semver)
Unaffected: 4.19.193 , ≤ 4.19.* (semver)
Unaffected: 5.4.124 , ≤ 5.4.* (semver)
Unaffected: 5.10.42 , ≤ 5.10.* (semver)
Unaffected: 5.12.9 , ≤ 5.12.* (semver)
Unaffected: 5.13 , ≤ * (original_commit_for_fix)
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This isn\u0027t a bug in the kernel; it\u0027s merely an invalid request\\nfrom the user and the usbfs code does handle it correctly.\\n\\nIn theory the same thing can happen with async transfers, or with the\\npacket descriptor table for isochronous transfers.\\n\\nTo prevent the MM subsystem from complaining about these bad\\nallocation requests, add the __GFP_NOWARN flag to the kmalloc calls\\nfor these buffers.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.193\", \"versionStartIncluding\": \"3.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.124\", \"versionStartIncluding\": \"3.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.42\", \"versionStartIncluding\": \"3.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.12.9\", \"versionStartIncluding\": \"3.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.13\", \"versionStartIncluding\": \"3.3\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-12-18T11:35:47.627Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47170\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-12-18T11:35:47.627Z\", \"dateReserved\": \"2024-03-25T09:12:14.111Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-03-25T09:16:22.313Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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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.