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

Vulnerability from cvelistv5 – Published: 2024-05-22 08:19 – Updated: 2026-05-11 13:55
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
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-06-25 18:23 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version CPE status
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)
guessed Create a notification for this product.
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)
guessed Create a notification for this product.
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                  "version": "a03bb00e50ab4c07107da58a52a0bff7943f360c",
                  "versionType": "git"
                },
                {
                  "lessThan": "bc51111bf6e8e7b6cc94b133e4c291273a16acd1",
                  "status": "affected",
                  "version": "a03bb00e50ab4c07107da58a52a0bff7943f360c",
                  "versionType": "git"
                },
                {
                  "lessThan": "b0156b7c9649d8f55a2ce3d3258509f1b2a181c3",
                  "status": "affected",
                  "version": "a03bb00e50ab4c07107da58a52a0bff7943f360c",
                  "versionType": "git"
                },
                {
                  "lessThan": "ef143dc0c3defe56730ecd3a9de7b3e1d7e557c1",
                  "status": "affected",
                  "version": "a03bb00e50ab4c07107da58a52a0bff7943f360c",
                  "versionType": "git"
                },
                {
                  "lessThan": "4a9d43cb5d5f39fa39fc1da438517004cc95f7ea",
                  "status": "affected",
                  "version": "a03bb00e50ab4c07107da58a52a0bff7943f360c",
                  "versionType": "git"
                },
                {
                  "lessThan": "d6a727a681a39ae4f73081a9bedb45d14f95bdd1",
                  "status": "affected",
                  "version": "a03bb00e50ab4c07107da58a52a0bff7943f360c",
                  "versionType": "git"
                },
                {
                  "lessThan": "907767da8f3a925b060c740e0b5c92ea7dbec440",
                  "status": "affected",
                  "version": "a03bb00e50ab4c07107da58a52a0bff7943f360c",
                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "drivers/comedi/drivers/ni_usb6501.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "3.18"
                },
                {
                  "lessThan": "3.18",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "4.4.*",
                  "status": "unaffected",
                  "version": "4.4.292",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "4.9.*",
                  "status": "unaffected",
                  "version": "4.9.290",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "4.14.*",
                  "status": "unaffected",
                  "version": "4.14.255",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "4.19.*",
                  "status": "unaffected",
                  "version": "4.19.217",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.4.*",
                  "status": "unaffected",
                  "version": "5.4.159",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.10.*",
                  "status": "unaffected",
                  "version": "5.10.79",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.14.*",
                  "status": "unaffected",
                  "version": "5.14.18",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.15.*",
                  "status": "unaffected",
                  "version": "5.15.2",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "5.16",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.4.292",
                      "versionStartIncluding": "3.18",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.9.290",
                      "versionStartIncluding": "3.18",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.14.255",
                      "versionStartIncluding": "3.18",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.19.217",
                      "versionStartIncluding": "3.18",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.4.159",
                      "versionStartIncluding": "3.18",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.10.79",
                      "versionStartIncluding": "3.18",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.14.18",
                      "versionStartIncluding": "3.18",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15.2",
                      "versionStartIncluding": "3.18",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.16",
                      "versionStartIncluding": "3.18",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "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()."
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2025-05-04T07:11:45.313Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "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"
            }
          ],
          "title": "comedi: ni_usb6501: fix NULL-deref in command paths",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2021-47476",
        "datePublished": "2024-05-22T08:19:30.201Z",
        "dateReserved": "2024-05-22T06:20:56.200Z",
        "dateUpdated": "2025-05-04T07:11:45.313Z",
        "state": "PUBLISHED"
      },
      "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

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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.
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  • 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.



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.