{"id":"CVE-2021-47476","state":"PUBLISHED","title":"comedi: ni_usb6501: fix NULL-deref in command paths","description":"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().","publishedAt":"2024-05-22T08:19:30.201Z","updatedAt":"2026-05-11T13:55:25.459Z","severity":{"score":4.6,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"CISA-ADP"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"a03bb00e50ab4c07107da58a52a0bff7943f360c","status":"affected","lessThan":"58478143771b20ab219937b1c30a706590a59224","versionType":"git"},{"version":"a03bb00e50ab4c07107da58a52a0bff7943f360c","status":"affected","lessThan":"aa39738423503825625853b643b9e99d11c23816","versionType":"git"},{"version":"a03bb00e50ab4c07107da58a52a0bff7943f360c","status":"affected","lessThan":"df7b1238f3b599a0b9284249772cdfd1ea83a632","versionType":"git"},{"version":"a03bb00e50ab4c07107da58a52a0bff7943f360c","status":"affected","lessThan":"bc51111bf6e8e7b6cc94b133e4c291273a16acd1","versionType":"git"},{"version":"a03bb00e50ab4c07107da58a52a0bff7943f360c","status":"affected","lessThan":"b0156b7c9649d8f55a2ce3d3258509f1b2a181c3","versionType":"git"},{"version":"a03bb00e50ab4c07107da58a52a0bff7943f360c","status":"affected","lessThan":"ef143dc0c3defe56730ecd3a9de7b3e1d7e557c1","versionType":"git"},{"version":"a03bb00e50ab4c07107da58a52a0bff7943f360c","status":"affected","lessThan":"4a9d43cb5d5f39fa39fc1da438517004cc95f7ea","versionType":"git"},{"version":"a03bb00e50ab4c07107da58a52a0bff7943f360c","status":"affected","lessThan":"d6a727a681a39ae4f73081a9bedb45d14f95bdd1","versionType":"git"},{"version":"a03bb00e50ab4c07107da58a52a0bff7943f360c","status":"affected","lessThan":"907767da8f3a925b060c740e0b5c92ea7dbec440","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/comedi/drivers/ni_usb6501.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.18","versionType":"semver"},{"version":"4.4.292","status":"unaffected","lessThanOrEqual":"4.4.*","versionType":"semver"},{"version":"4.9.290","status":"unaffected","lessThanOrEqual":"4.9.*","versionType":"semver"},{"version":"4.14.255","status":"unaffected","lessThanOrEqual":"4.14.*","versionType":"semver"},{"version":"4.19.217","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.159","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.79","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.14.18","status":"unaffected","lessThanOrEqual":"5.14.*","versionType":"semver"},{"version":"5.15.2","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"5.16","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/comedi/drivers/ni_usb6501.c"]}],"references":["https://git.kernel.org/stable/c/58478143771b20ab219937b1c30a706590a59224","https://git.kernel.org/stable/c/aa39738423503825625853b643b9e99d11c23816","https://git.kernel.org/stable/c/df7b1238f3b599a0b9284249772cdfd1ea83a632","https://git.kernel.org/stable/c/bc51111bf6e8e7b6cc94b133e4c291273a16acd1","https://git.kernel.org/stable/c/b0156b7c9649d8f55a2ce3d3258509f1b2a181c3","https://git.kernel.org/stable/c/ef143dc0c3defe56730ecd3a9de7b3e1d7e557c1","https://git.kernel.org/stable/c/4a9d43cb5d5f39fa39fc1da438517004cc95f7ea","https://git.kernel.org/stable/c/d6a727a681a39ae4f73081a9bedb45d14f95bdd1","https://git.kernel.org/stable/c/907767da8f3a925b060c740e0b5c92ea7dbec440"],"weaknesses":["CWE-476"],"ingestedAt":"2026-10-29T19:49:19.404Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/47xxx/CVE-2021-47476.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-47476","state":"PUBLISHED","datePublished":"2024-05-22T08:19:30.201Z","dateUpdated":"2026-05-11T13:55:25.459Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-05-22T06:20:56.200Z"},"containers":{"cna":{"title":"comedi: ni_usb6501: fix NULL-deref in command paths","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()."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"a03bb00e50ab4c07107da58a52a0bff7943f360c","status":"affected","lessThan":"58478143771b20ab219937b1c30a706590a59224","versionType":"git"},{"version":"a03bb00e50ab4c07107da58a52a0bff7943f360c","status":"affected","lessThan":"aa39738423503825625853b643b9e99d11c23816","versionType":"git"},{"version":"a03bb00e50ab4c07107da58a52a0bff7943f360c","status":"affected","lessThan":"df7b1238f3b599a0b9284249772cdfd1ea83a632","versionType":"git"},{"version":"a03bb00e50ab4c07107da58a52a0bff7943f360c","status":"affected","lessThan":"bc51111bf6e8e7b6cc94b133e4c291273a16acd1","versionType":"git"},{"version":"a03bb00e50ab4c07107da58a52a0bff7943f360c","status":"affected","lessThan":"b0156b7c9649d8f55a2ce3d3258509f1b2a181c3","versionType":"git"},{"version":"a03bb00e50ab4c07107da58a52a0bff7943f360c","status":"affected","lessThan":"ef143dc0c3defe56730ecd3a9de7b3e1d7e557c1","versionType":"git"},{"version":"a03bb00e50ab4c07107da58a52a0bff7943f360c","status":"affected","lessThan":"4a9d43cb5d5f39fa39fc1da438517004cc95f7ea","versionType":"git"},{"version":"a03bb00e50ab4c07107da58a52a0bff7943f360c","status":"affected","lessThan":"d6a727a681a39ae4f73081a9bedb45d14f95bdd1","versionType":"git"},{"version":"a03bb00e50ab4c07107da58a52a0bff7943f360c","status":"affected","lessThan":"907767da8f3a925b060c740e0b5c92ea7dbec440","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/comedi/drivers/ni_usb6501.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.18","versionType":"semver"},{"version":"4.4.292","status":"unaffected","lessThanOrEqual":"4.4.*","versionType":"semver"},{"version":"4.9.290","status":"unaffected","lessThanOrEqual":"4.9.*","versionType":"semver"},{"version":"4.14.255","status":"unaffected","lessThanOrEqual":"4.14.*","versionType":"semver"},{"version":"4.19.217","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.159","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.79","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.14.18","status":"unaffected","lessThanOrEqual":"5.14.*","versionType":"semver"},{"version":"5.15.2","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"5.16","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/comedi/drivers/ni_usb6501.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T13:55:25.459Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.18","versionEndExcluding":"4.4.292"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.18","versionEndExcluding":"4.9.290"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.18","versionEndExcluding":"4.14.255"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.18","versionEndExcluding":"4.19.217"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.18","versionEndExcluding":"5.4.159"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.18","versionEndExcluding":"5.10.79"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.18","versionEndExcluding":"5.14.18"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.18","versionEndExcluding":"5.15.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.18","versionEndExcluding":"5.16"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":4.6,"attackVector":"PHYSICAL","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"NONE","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"timestamp":"2024-06-25T18:23:48.578876Z","id":"CVE-2021-47476","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-476","type":"CWE","lang":"en","description":"CWE-476 NULL Pointer Dereference"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2024-11-01T14:38:44.765Z"}},{"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/58478143771b20ab219937b1c30a706590a59224","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/aa39738423503825625853b643b9e99d11c23816","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/df7b1238f3b599a0b9284249772cdfd1ea83a632","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/bc51111bf6e8e7b6cc94b133e4c291273a16acd1","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/b0156b7c9649d8f55a2ce3d3258509f1b2a181c3","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/ef143dc0c3defe56730ecd3a9de7b3e1d7e557c1","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/4a9d43cb5d5f39fa39fc1da438517004cc95f7ea","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/d6a727a681a39ae4f73081a9bedb45d14f95bdd1","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/907767da8f3a925b060c740e0b5c92ea7dbec440","tags":["x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-04T05:39:59.479Z"}}]}}}