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CVE-2025-21724

Estado: ModificadaAlta (7.8)—

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

iommufd/iova_bitmap: Fix shift-out-of-bounds in iova_bitmap_offset_to_index()

Resolve a UBSAN shift-out-of-bounds issue in iova_bitmap_offset_to_index() where shifting the constant "1" (of type int) by bitmap->mapped.pgshift (an unsigned long value) could result in undefined behavior.

The constant "1" defaults to a 32-bit "int", and when "pgshift" exceeds 31 (e.g., pgshift = 63) the shift operation overflows, as the result cannot be represented in a 32-bit type.

To resolve this, the constant is updated to "1UL", promoting it to an unsigned long type to match the operand's type.

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Acceso local sin interacción (AV:L/PR:L/UI:N) en kernel Linux; UBSAN overflow permite escalar privilegios o ejecutar código arbitrario con permisos elevados (C:H/I:H/A:H).

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Execution PreventionThreat Intelligence ProgramRestrict Web-Based ContentPrivileged Account ManagementLimit Software InstallationBehavior Prevention on Endpoint

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2025-21724",
  "cveTags": [],
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        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
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          "version": "3.1",
          "baseScore": 7.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.8
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          "value": "CWE-787"
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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommufd/iova_bitmap: Fix shift-out-of-bounds in iova_bitmap_offset_to_index()\n\nResolve a UBSAN shift-out-of-bounds issue in iova_bitmap_offset_to_index()\nwhere shifting the constant \"1\" (of type int) by bitmap->mapped.pgshift\n(an unsigned long value) could result in undefined behavior.\n\nThe constant \"1\" defaults to a 32-bit \"int\", and when \"pgshift\" exceeds\n31 (e.g., pgshift = 63) the shift operation overflows, as the result\ncannot be represented in a 32-bit type.\n\nTo resolve this, the constant is updated to \"1UL\", promoting it to an\nunsigned long type to match the operand's type."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: iommufd/iova_bitmap: Se soluciona el problema de desplazamiento fuera de los límites en iova_bitmap_offset_to_index() Se soluciona un problema de desplazamiento fuera de los límites de UBSAN en iova_bitmap_offset_to_index() donde desplazar la constante \"1\" (de tipo int) por bitmap->mapped.pgshift (un valor unsigned long) podría resultar en un comportamiento indefinido. La constante \"1\" tiene como valor predeterminado un \"int\" de 32 bits, y cuando \"pgshift\" supera los 31 (por ejemplo, pgshift = 63) la operación de desplazamiento se desborda, ya que el resultado no se puede representar en un tipo de 32 bits. Para resolver esto, la constante se actualiza a \"1UL\", promoviéndola a un tipo unsigned long para que coincida con el tipo del operando."
    }
  ],
  "lastModified": "2026-06-17T08:44:07.600",
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