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CVE-2025-0685

Estado: ModificadaMedia (6.4)—

A flaw was found in grub2. When reading data from a jfs filesystem, grub's jfs filesystem module uses user-controlled parameters from the filesystem geometry to determine the internal buffer size, however, it improperly checks for integer overflows. A maliciouly crafted filesystem may lead some of those buffer size calculations to overflow, causing it to perform a grub_malloc() operation with a smaller size than expected. As a result, the grub_jfs_lookup_symlink() function will write past the internal buffer length during grub_jfs_read_file(). This issue can be leveraged to corrupt grub's internal critical data and may result in arbitrary code execution, by-passing secure boot protections.

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)

GNU — Grub2

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2025-0685",
  "cveTags": [],
  "metrics": {
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          "role": "CISA Coordinator",
          "options": [
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              "exploitation": "none"
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              "automatable": "no"
            },
            {
              "technicalImpact": "total"
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          "version": "2.0.3",
          "timestamp": "2025-03-04T16:13:24.859221Z"
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          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "HIGH",
          "confidentialityImpact": "HIGH"
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        "impactScore": 5.9,
        "exploitabilityScore": 0.5
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          "privilegesRequired": "HIGH",
          "confidentialityImpact": "HIGH"
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  "affected": [
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      "source": "secalert@redhat.com",
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              "status": "affected",
              "version": "0",
              "versionType": "semver",
              "lessThanOrEqual": "2.12"
            }
          ],
          "packageName": "grub2",
          "collectionURL": "https://www.gnu.org/software/grub/",
          "defaultStatus": "unaffected"
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          "product": "Red Hat Enterprise Linux 10",
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          "product": "Red Hat Enterprise Linux 7",
          "packageName": "grub2",
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "defaultStatus": "unaffected"
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        {
          "cpes": [
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          "product": "Red Hat Enterprise Linux 8",
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          "cpes": [
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          "product": "Red Hat OpenShift Container Platform 4",
          "packageName": "rhcos",
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  "published": "2025-03-03T18:15:30.733",
  "references": [
    {
      "url": "https://access.redhat.com/security/cve/CVE-2025-0685",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "secalert@redhat.com"
    },
    {
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2346120",
      "tags": [
        "Issue Tracking"
      ],
      "source": "secalert@redhat.com"
    },
    {
      "url": "https://lists.gnu.org/archive/html/grub-devel/2025-02/msg00024.html",
      "source": "secalert@redhat.com"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "secalert@redhat.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A flaw was found in grub2. When reading data from a jfs filesystem, grub's jfs filesystem module uses user-controlled parameters from the filesystem geometry to determine the internal buffer size, however, it improperly checks for integer overflows. A maliciouly crafted filesystem may lead some of those buffer size calculations to overflow, causing it to perform a grub_malloc() operation with a smaller size than expected. As a result, the grub_jfs_lookup_symlink() function will write past the internal buffer length during grub_jfs_read_file(). This issue can be leveraged to corrupt grub's internal critical data and may result in arbitrary code execution, by-passing secure boot protections."
    },
    {
      "lang": "es",
      "value": "Se encontró una falla en grub2. Al leer datos de un sistema de archivos jfs, el módulo de sistema de archivos jfs de grub utiliza parámetros controlados por el usuario de la geometría del sistema de archivos para determinar el tamaño del búfer interno; sin embargo, verifica incorrectamente si hay desbordamientos de números enteros. Un sistema de archivos malipulados con fines malintencionados puede provocar que algunos de esos cálculos de tamaño de búfer se desborden, lo que hace que realice una operación grub_malloc() con un tamaño menor al esperado. Como resultado, la función grub_jfs_lookup_symlink() escribirá más allá de la longitud del búfer interno durante grub_jfs_read_file(). Este problema se puede aprovechar para corromper los datos críticos internos de grub y puede resultar en la ejecución de código arbitrario, eludiendo las protecciones de arranque seguro."
    }
  ],
  "lastModified": "2026-06-30T00:16:50.477",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "criteria": "cpe:2.3:a:gnu:grub2:*:*:*:*:*:*:*:*",
              "vulnerable": true,
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              "versionEndIncluding": "2.12"
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          "operator": "OR"
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  "sourceIdentifier": "secalert@redhat.com"
}