CVE-2025-0686
Full vulnerability record from the local CVENow database.
Description
A flaw was found in grub2. When performing a symlink lookup from a romfs filesystem, grub's romfs filesystem module uses user-controlled parameters from the filesystem geometry to determine the internal buffer size, however, it improperly checks for integer overflows. A maliciously 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_romfs_read_symlink() may cause out-of-bounds writes when the calling grub_disk_read() function. This issue may be leveraged to corrupt grub's internal critical data and can result in arbitrary code execution by-passing secure boot protections.
Severity
MEDIUM
CVSS score
6.4
(v3.1)
Vulnerability status
Modified
Source identifier
Published
2025-03-03 18:15:30.930000
Last modified
2026-10-21 17:17:27.650000
View original CVE JSON
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"id": "CVE-2025-0686",
"sourceIdentifier": "[email protected]",
"published": "2025-03-03T18:15:30.930",
"lastModified": "2026-10-21T17:17:27.650",
"vulnStatus": "Modified",
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"value": "A flaw was found in grub2. When performing a symlink lookup from a romfs filesystem, grub's romfs filesystem module uses user-controlled parameters from the filesystem geometry to determine the internal buffer size, however, it improperly checks for integer overflows. A maliciously 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_romfs_read_symlink() may cause out-of-bounds writes when the calling grub_disk_read() function. This issue may be leveraged to corrupt grub's internal critical data and can result in arbitrary code execution by-passing secure boot protections."
},
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"value": "Se encontró una falla en grub2. Al realizar una búsqueda de enlace simbólico desde un sistema de archivos romfs, el módulo de sistema de archivos romfs 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 manipulado 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, grub_romfs_read_symlink() puede provocar escrituras fuera de los límites cuando se llama a la función grub_disk_read(). Este problema se puede aprovechar para corromper los datos críticos internos de grub y puede provocar la ejecución de código arbitrario que pasa por alto las protecciones de arranque seguro."
}
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"affected": [
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"source": "[email protected]",
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"source": "[email protected]",
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}