{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2021-47218","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-04-10T18:59:19.528Z","datePublished":"2024-04-10T19:01:57.060Z","dateUpdated":"2025-05-04T07:06:33.960Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2025-05-04T07:06:33.960Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nselinux: fix NULL-pointer dereference when hashtab allocation fails\n\nWhen the hash table slot array allocation fails in hashtab_init(),\nh->size is left initialized with a non-zero value, but the h->htable\npointer is NULL. This may then cause a NULL pointer dereference, since\nthe policydb code relies on the assumption that even after a failed\nhashtab_init(), hashtab_map() and hashtab_destroy() can be safely called\non it. Yet, these detect an empty hashtab only by looking at the size.\n\nFix this by making sure that hashtab_init() always leaves behind a valid\nempty hashtab when the allocation fails."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["security/selinux/ss/hashtab.c"],"versions":[{"version":"03414a49ad5f3c56988c36d2070e402ffa17feaf","lessThan":"b17dd53cac769dd13031b0ca34f90cc65e523fab","status":"affected","versionType":"git"},{"version":"03414a49ad5f3c56988c36d2070e402ffa17feaf","lessThan":"83c8ab8503adf56bf68dafc7a382f4946c87da79","status":"affected","versionType":"git"},{"version":"03414a49ad5f3c56988c36d2070e402ffa17feaf","lessThan":"dc27f3c5d10c58069672215787a96b4fae01818b","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["security/selinux/ss/hashtab.c"],"versions":[{"version":"5.8","status":"affected"},{"version":"0","lessThan":"5.8","status":"unaffected","versionType":"semver"},{"version":"5.10.82","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.5","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":"5.8","versionEndExcluding":"5.10.82"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.8","versionEndExcluding":"5.15.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.8","versionEndExcluding":"5.16"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/b17dd53cac769dd13031b0ca34f90cc65e523fab"},{"url":"https://git.kernel.org/stable/c/83c8ab8503adf56bf68dafc7a382f4946c87da79"},{"url":"https://git.kernel.org/stable/c/dc27f3c5d10c58069672215787a96b4fae01818b"}],"title":"selinux: fix NULL-pointer dereference when hashtab allocation fails","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2024-04-15T15:01:50.328604Z","id":"CVE-2021-47218","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2024-07-03T17:45:07.734Z"}},{"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2024-08-04T05:32:07.363Z"},"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/b17dd53cac769dd13031b0ca34f90cc65e523fab","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/83c8ab8503adf56bf68dafc7a382f4946c87da79","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/dc27f3c5d10c58069672215787a96b4fae01818b","tags":["x_transferred"]}]}]}}