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GHSA-5V22-VQG5-VRR8

Vulnerability from github – Published: 2026-09-04 18:31 – Updated: 2026-09-04 18:31
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

selinux: reject an unclaimed class value in security_get_classes()

security_get_classes() sizes an array by p_classes.nprim and fills it at value - 1, so a class value the policy never defines leaves a NULL. sel_make_classes() passes every entry to sel_make_dir(), reaching the same d_alloc_name() dereference as the permission array. The class symbol table is allowed to be sparse (policydb_class_isvalid() exists to absorb that), but this getter builds its own array straight from the hash table and has no such predicate.

Fail the lookup when a value went unclaimed instead of handing out the NULL. Conforming policies define every class they declare and are unaffected.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-80912"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-04T18:18:01Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nselinux: reject an unclaimed class value in security_get_classes()\n\nsecurity_get_classes() sizes an array by p_classes.nprim and fills it at\nvalue - 1, so a class value the policy never defines leaves a NULL.\nsel_make_classes() passes every entry to sel_make_dir(), reaching the same\nd_alloc_name() dereference as the permission array. The class symbol table\nis allowed to be sparse (policydb_class_isvalid() exists to absorb that),\nbut this getter builds its own array straight from the hash table and has\nno such predicate.\n\nFail the lookup when a value went unclaimed instead of handing out the\nNULL. Conforming policies define every class they declare and are\nunaffected.",
  "id": "GHSA-5v22-vqg5-vrr8",
  "modified": "2026-09-04T18:31:34Z",
  "published": "2026-09-04T18:31:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80912"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/099869e9343a5f8c22b58497f074b34f63cbf856"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/22b05fec62c0fe9864cfceb52f7d0f3a34d9b1dd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/841aea4d5a25e16273d04cd07a74142b4687e03b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d8a10899ea3c84b80de72ca8ee9039e9a5156c9a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e0285bb152211c00900136b66d4b420c14a59094"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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