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GHSA-JCJ2-5FHP-X66J

Vulnerability from github – Published: 2026-09-03 15:32 – Updated: 2026-09-03 15:32
VLAI
Details

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

selinux: reject a permission value exceeding the class permission count

perm_read() bounds a permission value by SEL_VEC_MAX but never by the nprim of the owning class or common, which is taken verbatim from the policy image. security_get_permissions() then writes perms[value - 1] into an nprim-sized kcalloc() array, so a class declaring fewer permissions than its largest permission value drives an out-of-bounds heap write. The top-level symbol tables are validated this way; the nested per-class permission table is not.

Reject a permission whose value exceeds nprim, which is already set when perm_read() runs. Well-formed policies are unaffected.

[PM: tweak comment for line length]

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{
  "affected": [],
  "aliases": [
    "CVE-2026-80755"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-03T13:06:15Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nselinux: reject a permission value exceeding the class permission count\n\nperm_read() bounds a permission value by SEL_VEC_MAX but never by the\nnprim of the owning class or common, which is taken verbatim from the\npolicy image.  security_get_permissions() then writes perms[value - 1]\ninto an nprim-sized kcalloc() array, so a class declaring fewer\npermissions than its largest permission value drives an out-of-bounds\nheap write.  The top-level symbol tables are validated this way; the\nnested per-class permission table is not.\n\nReject a permission whose value exceeds nprim, which is already set when\nperm_read() runs.  Well-formed policies are unaffected.\n\n[PM: tweak comment for line length]",
  "id": "GHSA-jcj2-5fhp-x66j",
  "modified": "2026-09-03T15:32:16Z",
  "published": "2026-09-03T15:32:16Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80755"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6c2ab7c4549f4f2305848df834e784651dbf1676"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a7f3d4f22d920dc3c7d75f02ece0f7bf2c58437e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d14b5d0e97fccd27974fedc03b903408872907fd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dfc59a062c386d3d4415ecdab781065a645f33cc"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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