fkie_cve-2025-40022
Vulnerability from fkie_nvd
Published
2025-10-24 13:15
Modified
2025-10-27 13:20
Severity ?
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/316b090c2fee964c307a634fecc7df269664b158
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3a21698ace915a445bce2d0dcfc84b6d2199baf7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/54506c6335690f4ef1b9f154e34f5a604c72c1ed
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8703940bd30b5ad94408d28d7192db2491cd3592
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d0ca0df179c4b21e2a6c4a4fb637aa8fa14575cb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d382d6daf0184490f366562469a5673f65ee2662
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fbe96bd25423e61273d8831e995260b429d850b6
Impacted products
Vendor Product Version


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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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": "CVE-2025-40022",
  "lastModified": "2025-10-27T13:20:15.637",
  "metrics": {},
  "published": "2025-10-24T13:15:47.387",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/316b090c2fee964c307a634fecc7df269664b158"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3a21698ace915a445bce2d0dcfc84b6d2199baf7"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/54506c6335690f4ef1b9f154e34f5a604c72c1ed"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8703940bd30b5ad94408d28d7192db2491cd3592"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d0ca0df179c4b21e2a6c4a4fb637aa8fa14575cb"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d382d6daf0184490f366562469a5673f65ee2662"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/fbe96bd25423e61273d8831e995260b429d850b6"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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