CVE-2021-47476 (GCVE-0-2021-47476)

Vulnerability from cvelistv5 – Published: 2024-05-22 08:19 – Updated: 2025-05-04 07:11
VLAI?
Title
comedi: ni_usb6501: fix NULL-deref in command paths
Summary
In the Linux kernel, the following vulnerability has been resolved: comedi: ni_usb6501: fix NULL-deref in command paths The driver uses endpoint-sized USB transfer buffers but had no sanity checks on the sizes. This can lead to zero-size-pointer dereferences or overflowed transfer buffers in ni6501_port_command() and ni6501_counter_command() if a (malicious) device has smaller max-packet sizes than expected (or when doing descriptor fuzz testing). Add the missing sanity checks to probe().
Severity ?
4.6 (Medium)
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: a03bb00e50ab4c07107da58a52a0bff7943f360c , < 58478143771b20ab219937b1c30a706590a59224 (git)
Affected: a03bb00e50ab4c07107da58a52a0bff7943f360c , < aa39738423503825625853b643b9e99d11c23816 (git)
Affected: a03bb00e50ab4c07107da58a52a0bff7943f360c , < df7b1238f3b599a0b9284249772cdfd1ea83a632 (git)
Affected: a03bb00e50ab4c07107da58a52a0bff7943f360c , < bc51111bf6e8e7b6cc94b133e4c291273a16acd1 (git)
Affected: a03bb00e50ab4c07107da58a52a0bff7943f360c , < b0156b7c9649d8f55a2ce3d3258509f1b2a181c3 (git)
Affected: a03bb00e50ab4c07107da58a52a0bff7943f360c , < ef143dc0c3defe56730ecd3a9de7b3e1d7e557c1 (git)
Affected: a03bb00e50ab4c07107da58a52a0bff7943f360c , < 4a9d43cb5d5f39fa39fc1da438517004cc95f7ea (git)
Affected: a03bb00e50ab4c07107da58a52a0bff7943f360c , < d6a727a681a39ae4f73081a9bedb45d14f95bdd1 (git)
Affected: a03bb00e50ab4c07107da58a52a0bff7943f360c , < 907767da8f3a925b060c740e0b5c92ea7dbec440 (git)
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    Linux Linux Affected: 3.18
Unaffected: 0 , < 3.18 (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)
Create a notification for this product.
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\"versionType\": \"semver\", \"lessThanOrEqual\": \"4.14.*\"}, {\"status\": \"unaffected\", \"version\": \"4.19.217\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.159\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.79\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.14.18\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.14.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.2\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"5.16\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/comedi/drivers/ni_usb6501.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/58478143771b20ab219937b1c30a706590a59224\"}, {\"url\": \"https://git.kernel.org/stable/c/aa39738423503825625853b643b9e99d11c23816\"}, {\"url\": \"https://git.kernel.org/stable/c/df7b1238f3b599a0b9284249772cdfd1ea83a632\"}, {\"url\": \"https://git.kernel.org/stable/c/bc51111bf6e8e7b6cc94b133e4c291273a16acd1\"}, {\"url\": \"https://git.kernel.org/stable/c/b0156b7c9649d8f55a2ce3d3258509f1b2a181c3\"}, {\"url\": \"https://git.kernel.org/stable/c/ef143dc0c3defe56730ecd3a9de7b3e1d7e557c1\"}, {\"url\": \"https://git.kernel.org/stable/c/4a9d43cb5d5f39fa39fc1da438517004cc95f7ea\"}, {\"url\": \"https://git.kernel.org/stable/c/d6a727a681a39ae4f73081a9bedb45d14f95bdd1\"}, {\"url\": \"https://git.kernel.org/stable/c/907767da8f3a925b060c740e0b5c92ea7dbec440\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\ncomedi: ni_usb6501: fix NULL-deref in command paths\\n\\nThe driver uses endpoint-sized USB transfer buffers but had no sanity\\nchecks on the sizes. This can lead to zero-size-pointer dereferences or\\noverflowed transfer buffers in ni6501_port_command() and\\nni6501_counter_command() if a (malicious) device has smaller max-packet\\nsizes than expected (or when doing descriptor fuzz testing).\\n\\nAdd the missing sanity checks to probe().\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.4.292\", \"versionStartIncluding\": \"3.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.9.290\", \"versionStartIncluding\": \"3.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.255\", \"versionStartIncluding\": \"3.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.217\", \"versionStartIncluding\": \"3.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.159\", \"versionStartIncluding\": \"3.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.79\", \"versionStartIncluding\": \"3.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.14.18\", \"versionStartIncluding\": \"3.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.2\", \"versionStartIncluding\": \"3.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.16\", \"versionStartIncluding\": \"3.18\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T07:11:45.313Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47476\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T07:11:45.313Z\", \"dateReserved\": \"2024-05-22T06:20:56.200Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-22T08:19:30.201Z\", \"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.