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CVE-2025-37984

Estado: ModificadaMedia (5.5)—

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):

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().

Detalles técnicos trazas, registros y código del informe original
  X / 8 + !!(X & 7)

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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          "version": "3.1",
          "baseScore": 7,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
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          "programFiles": [
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            "crypto/ecdsa-x962.c",
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  "published": "2025-05-20T18:15:45.253",
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      "source": "nvd@nist.gov",
      "description": [
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          "lang": "en",
          "value": "CWE-190"
        }
      ]
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  "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's ->key_size() callback returns an unusually large value.\nHerbert instead suggests (for a division by 8):\n\n  X / 8 + !!(X & 7)\n\nBased on this formula, introduce a generic DIV_ROUND_UP_POW2() macro and\nuse it in lieu of DIV_ROUND_UP() for ->key_size() return values.\n\nAdditionally, use the macro in ecc_digits_from_bytes(), whose \"nbytes\"\nparameter is a ->key_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 - Protección contra desbordamientos de enteros en DIV_ROUND_UP(). Herbert señala que DIV_ROUND_UP() puede desbordarse innecesariamente si la función de retorno ->key_size() de una implementación de ecdsa devuelve un valor inusualmente grande. En su lugar, Herbert sugiere (para una división entre 8): X / 8 + !!(X y 7). Con base en esta fórmula, introduzca una macro genérica DIV_ROUND_UP_POW2() y úsela en lugar de DIV_ROUND_UP() para los valores de retorno de ->key_size(). Además, utilice la macro en ecc_digits_from_bytes(), cuyo parámetro \"nbytes\" es un valor de retorno de ->key_size() en algunos casos, o una longitud ASN.1 especificada por el usuario en el caso de ecdsa_get_signature_rs()."
    }
  ],
  "lastModified": "2026-07-30T06:22:42.710",
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