fkie_cve-2025-37984
Vulnerability from fkie_nvd
Published
2025-05-20 18:15
Modified
2025-07-25 14:15
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: crypto: ecdsa - Harden against integer overflows in DIV_ROUND_UP() Herbert notes that DIV_ROUND_UP() may overflow unnecessarily if an ecdsa implementation's ->key_size() callback returns an unusually large value. Herbert instead suggests (for a division by 8): X / 8 + !!(X & 7) Based on this formula, introduce a generic DIV_ROUND_UP_POW2() macro and use it in lieu of DIV_ROUND_UP() for ->key_size() return values. Additionally, use the macro in ecc_digits_from_bytes(), whose "nbytes" parameter is a ->key_size() return value in some instances, or a user-specified ASN.1 length in the case of ecdsa_get_signature_rs().
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/921b8167f10708e38080f84e195cdc68a7a561f1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b16510a530d1e6ab9683f04f8fb34f2e0f538275
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f02f0218be412cff1c844addf58e002071be298b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f2133b849ff273abddb6da622daddd8f6f6fa448
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: ecdsa - Harden against integer overflows in DIV_ROUND_UP()\n\nHerbert notes that DIV_ROUND_UP() may overflow unnecessarily if an ecdsa\nimplementation\u0027s -\u003ekey_size() callback returns an unusually large value.\nHerbert instead suggests (for a division by 8):\n\n  X / 8 + !!(X \u0026 7)\n\nBased on this formula, introduce a generic DIV_ROUND_UP_POW2() macro and\nuse it in lieu of DIV_ROUND_UP() for -\u003ekey_size() return values.\n\nAdditionally, use the macro in ecc_digits_from_bytes(), whose \"nbytes\"\nparameter is a -\u003ekey_size() return value in some instances, or a\nuser-specified ASN.1 length in the case of ecdsa_get_signature_rs()."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: crypto: ecdsa - Protecci\u00f3n contra desbordamientos de enteros en DIV_ROUND_UP(). Herbert se\u00f1ala que DIV_ROUND_UP() puede desbordarse innecesariamente si la funci\u00f3n de retorno -\u0026gt;key_size() de una implementaci\u00f3n de ecdsa devuelve un valor inusualmente grande. En su lugar, Herbert sugiere (para una divisi\u00f3n entre 8): X / 8 + !!(X y 7). Con base en esta f\u00f3rmula, introduzca una macro gen\u00e9rica DIV_ROUND_UP_POW2() y \u00fasela en lugar de DIV_ROUND_UP() para los valores de retorno de -\u0026gt;key_size(). Adem\u00e1s, utilice la macro en ecc_digits_from_bytes(), cuyo par\u00e1metro \"nbytes\" es un valor de retorno de -\u0026gt;key_size() en algunos casos, o una longitud ASN.1 especificada por el usuario en el caso de ecdsa_get_signature_rs()."
    }
  ],
  "id": "CVE-2025-37984",
  "lastModified": "2025-07-25T14:15:31.667",
  "metrics": {},
  "published": "2025-05-20T18:15:45.253",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/921b8167f10708e38080f84e195cdc68a7a561f1"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b16510a530d1e6ab9683f04f8fb34f2e0f538275"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f02f0218be412cff1c844addf58e002071be298b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f2133b849ff273abddb6da622daddd8f6f6fa448"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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