{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "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": "2026-05-11T13:50:16.030Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T13:50:16.030Z" }, "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" ] } ] } ] } }