CVE-2021-47475 (GCVE-0-2021-47475)

Vulnerability from cvelistv5 – Published: 2024-05-22 08:19 – Updated: 2025-05-04 07:11
VLAI?
Title
comedi: vmk80xx: fix transfer-buffer overflows
Summary
In the Linux kernel, the following vulnerability has been resolved: comedi: vmk80xx: fix transfer-buffer overflows The driver uses endpoint-sized USB transfer buffers but up until recently had no sanity checks on the sizes. Commit e1f13c879a7c ("staging: comedi: check validity of wMaxPacketSize of usb endpoints found") inadvertently fixed NULL-pointer dereferences when accessing the transfer buffers in case a malicious device has a zero wMaxPacketSize. Make sure to allocate buffers large enough to handle also the other accesses that are done without a size check (e.g. byte 18 in vmk80xx_cnt_insn_read() for the VMK8061_MODEL) to avoid writing beyond the buffers, for example, when doing descriptor fuzzing. The original driver was for a low-speed device with 8-byte buffers. Support was later added for a device that uses bulk transfers and is presumably a full-speed device with a maximum 64-byte wMaxPacketSize.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 985cafccbf9b7f862aa1c5ee566801e18b5161fb , < 5229159f1d052821007aff1a1beb7873eacf1a9f (git)
Affected: 985cafccbf9b7f862aa1c5ee566801e18b5161fb , < ec85bcff4ed09260243d8f39faba99e1041718ba (git)
Affected: 985cafccbf9b7f862aa1c5ee566801e18b5161fb , < 40d2a7e278e2e7c0a5fd7e997e7eb63945bf93f7 (git)
Affected: 985cafccbf9b7f862aa1c5ee566801e18b5161fb , < 7a2021b896de1ad559d33b5c5cdd20b982242088 (git)
Affected: 985cafccbf9b7f862aa1c5ee566801e18b5161fb , < 199acd8c110e3ae62833c24f632b0bb1c9f012a9 (git)
Affected: 985cafccbf9b7f862aa1c5ee566801e18b5161fb , < 33d7a470730dfe7c9bfc8da84575cf2cedd60d00 (git)
Affected: 985cafccbf9b7f862aa1c5ee566801e18b5161fb , < 278484ae93297b1bb1ce755f9d3b6d95a48c7d47 (git)
Affected: 985cafccbf9b7f862aa1c5ee566801e18b5161fb , < 06ac746d57e6d32b062e220415c607b7e2e0fa50 (git)
Affected: 985cafccbf9b7f862aa1c5ee566801e18b5161fb , < a23461c47482fc232ffc9b819539d1f837adf2b1 (git)
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    Linux Linux Affected: 2.6.31
Unaffected: 0 , < 2.6.31 (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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\"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"5.16\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/comedi/drivers/vmk80xx.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/5229159f1d052821007aff1a1beb7873eacf1a9f\"}, {\"url\": \"https://git.kernel.org/stable/c/ec85bcff4ed09260243d8f39faba99e1041718ba\"}, {\"url\": \"https://git.kernel.org/stable/c/40d2a7e278e2e7c0a5fd7e997e7eb63945bf93f7\"}, {\"url\": \"https://git.kernel.org/stable/c/7a2021b896de1ad559d33b5c5cdd20b982242088\"}, {\"url\": \"https://git.kernel.org/stable/c/199acd8c110e3ae62833c24f632b0bb1c9f012a9\"}, {\"url\": \"https://git.kernel.org/stable/c/33d7a470730dfe7c9bfc8da84575cf2cedd60d00\"}, {\"url\": \"https://git.kernel.org/stable/c/278484ae93297b1bb1ce755f9d3b6d95a48c7d47\"}, {\"url\": \"https://git.kernel.org/stable/c/06ac746d57e6d32b062e220415c607b7e2e0fa50\"}, {\"url\": \"https://git.kernel.org/stable/c/a23461c47482fc232ffc9b819539d1f837adf2b1\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\ncomedi: vmk80xx: fix transfer-buffer overflows\\n\\nThe driver uses endpoint-sized USB transfer buffers but up until\\nrecently had no sanity checks on the sizes.\\n\\nCommit e1f13c879a7c (\\\"staging: comedi: check validity of wMaxPacketSize\\nof usb endpoints found\\\") inadvertently fixed NULL-pointer dereferences\\nwhen accessing the transfer buffers in case a malicious device has a\\nzero wMaxPacketSize.\\n\\nMake sure to allocate buffers large enough to handle also the other\\naccesses that are done without a size check (e.g. byte 18 in\\nvmk80xx_cnt_insn_read() for the VMK8061_MODEL) to avoid writing beyond\\nthe buffers, for example, when doing descriptor fuzzing.\\n\\nThe original driver was for a low-speed device with 8-byte buffers.\\nSupport was later added for a device that uses bulk transfers and is\\npresumably a full-speed device with a maximum 64-byte wMaxPacketSize.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.4.292\", \"versionStartIncluding\": \"2.6.31\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.9.290\", \"versionStartIncluding\": \"2.6.31\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.255\", \"versionStartIncluding\": \"2.6.31\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.217\", \"versionStartIncluding\": \"2.6.31\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.159\", \"versionStartIncluding\": \"2.6.31\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.79\", \"versionStartIncluding\": \"2.6.31\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.14.18\", \"versionStartIncluding\": \"2.6.31\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.2\", \"versionStartIncluding\": \"2.6.31\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.16\", \"versionStartIncluding\": \"2.6.31\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T07:11:43.980Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47475\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T07:11:43.980Z\", \"dateReserved\": \"2024-05-22T06:20:56.200Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-22T08:19:29.423Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Sightings

Author Source Type Date

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.