cve-2021-47218
Vulnerability from cvelistv5
Published
2024-04-10 19:01
Modified
2024-11-04 12:01
Severity ?
Summary
selinux: fix NULL-pointer dereference when hashtab allocation fails
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website


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                "id": "CVE-2021-47218",
                "options": [
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                    "Exploitation": "none"
                  },
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                    "Automatable": "no"
                  },
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                    "Technical Impact": "total"
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                "role": "CISA Coordinator",
                "timestamp": "2024-04-15T15:01:50.328604Z",
                "version": "2.0.3"
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    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "security/selinux/ss/hashtab.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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          "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-\u003esize is left initialized with a non-zero value, but the h-\u003ehtable\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."
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    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47218",
    "datePublished": "2024-04-10T19:01:57.060Z",
    "dateReserved": "2024-04-10T18:59:19.528Z",
    "dateUpdated": "2024-11-04T12:01:42.926Z",
    "state": "PUBLISHED"
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