{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2021-47477","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-05-22T06:20:56.200Z","datePublished":"2024-05-22T08:19:30.860Z","dateUpdated":"2025-05-04T07:11:51.469Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2025-05-04T07:11:51.469Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ncomedi: dt9812: fix DMA buffers on stack\n\nUSB transfer buffers are typically mapped for DMA and must not be\nallocated on the stack or transfers will fail.\n\nAllocate proper transfer buffers in the various command helpers and\nreturn an error on short transfers instead of acting on random stack\ndata.\n\nNote that this also fixes a stack info leak on systems where DMA is not\nused as 32 bytes are always sent to the device regardless of how short\nthe command is."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/comedi/drivers/dt9812.c"],"versions":[{"version":"63274cd7d38a3322d90b66a5bc976de1fb899051","lessThan":"a6af69768d5cb4b2528946d53be5fa19ade37723","status":"affected","versionType":"git"},{"version":"63274cd7d38a3322d90b66a5bc976de1fb899051","lessThan":"365a346cda82f51d835c49136a00a9df8a78c7f2","status":"affected","versionType":"git"},{"version":"63274cd7d38a3322d90b66a5bc976de1fb899051","lessThan":"8a52bc480992c7c9da3ebfea456af731f50a4b97","status":"affected","versionType":"git"},{"version":"63274cd7d38a3322d90b66a5bc976de1fb899051","lessThan":"39ea61037ae78f14fa121228dd962ea3280eacf3","status":"affected","versionType":"git"},{"version":"63274cd7d38a3322d90b66a5bc976de1fb899051","lessThan":"3efb7af8ac437085b6c776e5b54830b149d86efe","status":"affected","versionType":"git"},{"version":"63274cd7d38a3322d90b66a5bc976de1fb899051","lessThan":"786f5b03450454557ff858a8bead5d7c0cbf78d6","status":"affected","versionType":"git"},{"version":"63274cd7d38a3322d90b66a5bc976de1fb899051","lessThan":"3ac273d154d634e2034508a14db82a95d7ad12ed","status":"affected","versionType":"git"},{"version":"63274cd7d38a3322d90b66a5bc976de1fb899051","lessThan":"20cebb8b620dc987e55ddc46801de986e081757e","status":"affected","versionType":"git"},{"version":"63274cd7d38a3322d90b66a5bc976de1fb899051","lessThan":"536de747bc48262225889a533db6650731ab25d3","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/comedi/drivers/dt9812.c"],"versions":[{"version":"2.6.29","status":"affected"},{"version":"0","lessThan":"2.6.29","status":"unaffected","versionType":"semver"},{"version":"4.4.292","lessThanOrEqual":"4.4.*","status":"unaffected","versionType":"semver"},{"version":"4.9.290","lessThanOrEqual":"4.9.*","status":"unaffected","versionType":"semver"},{"version":"4.14.255","lessThanOrEqual":"4.14.*","status":"unaffected","versionType":"semver"},{"version":"4.19.217","lessThanOrEqual":"4.19.*","status":"unaffected","versionType":"semver"},{"version":"5.4.159","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.79","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.14.18","lessThanOrEqual":"5.14.*","status":"unaffected","versionType":"semver"},{"version":"5.15.2","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"5.16","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"4.4.292"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"4.9.290"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"4.14.255"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"4.19.217"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"5.4.159"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"5.10.79"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"5.14.18"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"5.15.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"5.16"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/a6af69768d5cb4b2528946d53be5fa19ade37723"},{"url":"https://git.kernel.org/stable/c/365a346cda82f51d835c49136a00a9df8a78c7f2"},{"url":"https://git.kernel.org/stable/c/8a52bc480992c7c9da3ebfea456af731f50a4b97"},{"url":"https://git.kernel.org/stable/c/39ea61037ae78f14fa121228dd962ea3280eacf3"},{"url":"https://git.kernel.org/stable/c/3efb7af8ac437085b6c776e5b54830b149d86efe"},{"url":"https://git.kernel.org/stable/c/786f5b03450454557ff858a8bead5d7c0cbf78d6"},{"url":"https://git.kernel.org/stable/c/3ac273d154d634e2034508a14db82a95d7ad12ed"},{"url":"https://git.kernel.org/stable/c/20cebb8b620dc987e55ddc46801de986e081757e"},{"url":"https://git.kernel.org/stable/c/536de747bc48262225889a533db6650731ab25d3"}],"title":"comedi: 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