{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2021-47109","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-03-04T18:12:48.836Z","datePublished":"2024-03-15T20:14:18.469Z","dateUpdated":"2025-05-04T07:04:21.104Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2025-05-04T07:04:21.104Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nneighbour: allow NUD_NOARP entries to be forced GCed\n\nIFF_POINTOPOINT interfaces use NUD_NOARP entries for IPv6. It's possible to\nfill up the neighbour table with enough entries that it will overflow for\nvalid connections after that.\n\nThis behaviour is more prevalent after commit 58956317c8de (\"neighbor:\nImprove garbage collection\") is applied, as it prevents removal from\nentries that are not NUD_FAILED, unless they are more than 5s old."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/core/neighbour.c"],"versions":[{"version":"58956317c8de52009d1a38a721474c24aef74fe7","lessThan":"d99029e6aab62aef0a0251588b2867e77e83b137","status":"affected","versionType":"git"},{"version":"58956317c8de52009d1a38a721474c24aef74fe7","lessThan":"d17d47da59f726dc4c87caebda3a50333d7e2fd3","status":"affected","versionType":"git"},{"version":"58956317c8de52009d1a38a721474c24aef74fe7","lessThan":"ddf088d7aaaaacfc836104f2e632b29b1d383cfc","status":"affected","versionType":"git"},{"version":"58956317c8de52009d1a38a721474c24aef74fe7","lessThan":"7a6b1ab7475fd6478eeaf5c9d1163e7a18125c8f","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/core/neighbour.c"],"versions":[{"version":"5.0","status":"affected"},{"version":"0","lessThan":"5.0","status":"unaffected","versionType":"semver"},{"version":"5.4.125","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.43","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.12.10","lessThanOrEqual":"5.12.*","status":"unaffected","versionType":"semver"},{"version":"5.13","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":"5.0","versionEndExcluding":"5.4.125"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"5.10.43"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"5.12.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"5.13"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/d99029e6aab62aef0a0251588b2867e77e83b137"},{"url":"https://git.kernel.org/stable/c/d17d47da59f726dc4c87caebda3a50333d7e2fd3"},{"url":"https://git.kernel.org/stable/c/ddf088d7aaaaacfc836104f2e632b29b1d383cfc"},{"url":"https://git.kernel.org/stable/c/7a6b1ab7475fd6478eeaf5c9d1163e7a18125c8f"}],"title":"neighbour: allow NUD_NOARP entries to be forced GCed","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2021-47109","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2024-03-19T15:24:45.992487Z"}}}],"providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2024-06-04T17:14:40.388Z"}},{"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2024-08-04T05:24:39.847Z"},"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/d99029e6aab62aef0a0251588b2867e77e83b137","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/d17d47da59f726dc4c87caebda3a50333d7e2fd3","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/ddf088d7aaaaacfc836104f2e632b29b1d383cfc","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/7a6b1ab7475fd6478eeaf5c9d1163e7a18125c8f","tags":["x_transferred"]}]}]}}