ghsa-rjhr-rr92-fh8c
Vulnerability from github
Published
2025-10-24 15:31
Modified
2025-10-24 15:31
Details

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

crypto: af_alg - Fix incorrect boolean values in af_alg_ctx

Commit 1b34cbbf4f01 ("crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg") changed some fields from bool to 1-bit bitfields of type u32.

However, some assignments to these fields, specifically 'more' and 'merge', assign values greater than 1. These relied on C's implicit conversion to bool, such that zero becomes false and nonzero becomes true.

With a 1-bit bitfields of type u32 instead, mod 2 of the value is taken instead, resulting in 0 being assigned in some cases when 1 was intended.

Fix this by restoring the bool type.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-40022"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-10-24T13:15:47Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: af_alg - Fix incorrect boolean values in af_alg_ctx\n\nCommit 1b34cbbf4f01 (\"crypto: af_alg - Disallow concurrent writes in\naf_alg_sendmsg\") changed some fields from bool to 1-bit bitfields of\ntype u32.\n\nHowever, some assignments to these fields, specifically \u0027more\u0027 and\n\u0027merge\u0027, assign values greater than 1.  These relied on C\u0027s implicit\nconversion to bool, such that zero becomes false and nonzero becomes\ntrue.\n\nWith a 1-bit bitfields of type u32 instead, mod 2 of the value is taken\ninstead, resulting in 0 being assigned in some cases when 1 was intended.\n\nFix this by restoring the bool type.",
  "id": "GHSA-rjhr-rr92-fh8c",
  "modified": "2025-10-24T15:31:25Z",
  "published": "2025-10-24T15:31:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40022"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/316b090c2fee964c307a634fecc7df269664b158"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3a21698ace915a445bce2d0dcfc84b6d2199baf7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/54506c6335690f4ef1b9f154e34f5a604c72c1ed"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8703940bd30b5ad94408d28d7192db2491cd3592"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d0ca0df179c4b21e2a6c4a4fb637aa8fa14575cb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d382d6daf0184490f366562469a5673f65ee2662"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fbe96bd25423e61273d8831e995260b429d850b6"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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