{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2021-47649","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-02-26T01:48:21.520Z","datePublished":"2025-02-26T01:54:16.574Z","dateUpdated":"2025-05-04T07:15:30.553Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2025-05-04T07:15:30.553Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nudmabuf: validate ubuf->pagecount\n\nSyzbot has reported GPF in sg_alloc_append_table_from_pages(). The\nproblem was in ubuf->pages == ZERO_PTR.\n\nubuf->pagecount is calculated from arguments passed from user-space. If\nuser creates udmabuf with list.size == 0 then ubuf->pagecount will be\nalso equal to zero; it causes kmalloc_array() to return ZERO_PTR.\n\nFix it by validating ubuf->pagecount before passing it to\nkmalloc_array()."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/dma-buf/udmabuf.c"],"versions":[{"version":"fbb0de795078190a9834b3409e4b009cfb18a6d4","lessThan":"5d50f851dd307c07ca5591297093f19967c834a9","status":"affected","versionType":"git"},{"version":"fbb0de795078190a9834b3409e4b009cfb18a6d4","lessThan":"b267a8118c2b171bf7d67b90ed64154eeab9fae0","status":"affected","versionType":"git"},{"version":"fbb0de795078190a9834b3409e4b009cfb18a6d4","lessThan":"811b667cefbea9cb7511a874b169d6a92907137e","status":"affected","versionType":"git"},{"version":"fbb0de795078190a9834b3409e4b009cfb18a6d4","lessThan":"a3728d32fc61eb0fe283cb8ff60b2c8f751e2202","status":"affected","versionType":"git"},{"version":"fbb0de795078190a9834b3409e4b009cfb18a6d4","lessThan":"9e9b4a269f84d3230f2af84ff42322db676440d9","status":"affected","versionType":"git"},{"version":"fbb0de795078190a9834b3409e4b009cfb18a6d4","lessThan":"2b6dd600dd72573c23ea180b5b0b2f1813405882","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/dma-buf/udmabuf.c"],"versions":[{"version":"4.20","status":"affected"},{"version":"0","lessThan":"4.20","status":"unaffected","versionType":"semver"},{"version":"5.4.189","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.110","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.33","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"5.16.19","lessThanOrEqual":"5.16.*","status":"unaffected","versionType":"semver"},{"version":"5.17.2","lessThanOrEqual":"5.17.*","status":"unaffected","versionType":"semver"},{"version":"5.18","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":"4.20","versionEndExcluding":"5.4.189"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"5.10.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"5.15.33"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"5.16.19"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"5.17.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"5.18"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/5d50f851dd307c07ca5591297093f19967c834a9"},{"url":"https://git.kernel.org/stable/c/b267a8118c2b171bf7d67b90ed64154eeab9fae0"},{"url":"https://git.kernel.org/stable/c/811b667cefbea9cb7511a874b169d6a92907137e"},{"url":"https://git.kernel.org/stable/c/a3728d32fc61eb0fe283cb8ff60b2c8f751e2202"},{"url":"https://git.kernel.org/stable/c/9e9b4a269f84d3230f2af84ff42322db676440d9"},{"url":"https://git.kernel.org/stable/c/2b6dd600dd72573c23ea180b5b0b2f1813405882"}],"title":"udmabuf: validate ubuf->pagecount","x_generator":{"engine":"bippy-1.2.0"}}}}