{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2021-47107","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-03-04T18:12:48.835Z","datePublished":"2024-03-04T18:15:38.706Z","dateUpdated":"2025-05-04T07:04:19.046Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2025-05-04T07:04:19.046Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nNFSD: Fix READDIR buffer overflow\n\nIf a client sends a READDIR count argument that is too small (say,\nzero), then the buffer size calculation in the new init_dirlist\nhelper functions results in an underflow, allowing the XDR stream\nfunctions to write beyond the actual buffer.\n\nThis calculation has always been suspect. NFSD has never sanity-\nchecked the READDIR count argument, but the old entry encoders\nmanaged the problem correctly.\n\nWith the commits below, entry encoding changed, exposing the\nunderflow to the pointer arithmetic in xdr_reserve_space().\n\nModern NFS clients attempt to retrieve as much data as possible\nfor each READDIR request. Also, we have no unit tests that\nexercise the behavior of READDIR at the lower bound of @count\nvalues. Thus this case was missed during testing."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/nfsd/nfs3proc.c","fs/nfsd/nfsproc.c"],"versions":[{"version":"37aa5e64022243e721b8334122997881177a4cfc","lessThan":"9e291a6a28d32545ed2fd959a8165144d1724df1","status":"affected","versionType":"git"},{"version":"7f87fc2d34d475225e78b7f5c4eabb121f4282b2","lessThan":"eabc0aab98e5218ceecd82069b0d6fdfff5ee885","status":"affected","versionType":"git"},{"version":"7f87fc2d34d475225e78b7f5c4eabb121f4282b2","lessThan":"53b1119a6e5028b125f431a0116ba73510d82a72","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/nfsd/nfs3proc.c","fs/nfsd/nfsproc.c"],"versions":[{"version":"5.13","status":"affected"},{"version":"0","lessThan":"5.13","status":"unaffected","versionType":"semver"},{"version":"5.15.12","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":"5.13","versionEndExcluding":"5.15.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"5.16"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/9e291a6a28d32545ed2fd959a8165144d1724df1"},{"url":"https://git.kernel.org/stable/c/eabc0aab98e5218ceecd82069b0d6fdfff5ee885"},{"url":"https://git.kernel.org/stable/c/53b1119a6e5028b125f431a0116ba73510d82a72"}],"title":"NFSD: Fix READDIR buffer overflow","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2024-07-24T14:23:20.067017Z","id":"CVE-2021-47107","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2024-07-24T14:23:30.968Z"}},{"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2024-08-04T05:24:39.886Z"},"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/9e291a6a28d32545ed2fd959a8165144d1724df1","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/eabc0aab98e5218ceecd82069b0d6fdfff5ee885","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/53b1119a6e5028b125f431a0116ba73510d82a72","tags":["x_transferred"]}]}]}}