CVE-2025-71266

Estado: ModificadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
fs: ntfs3: check return value of indx_find to avoid infinite loop
We found an infinite loop bug in the ntfs3 file system that can lead to a Denial-of-Service (DoS) condition.
A malformed dentry in the ntfs3 filesystem can cause the kernel to hang during the lookup operations. By setting the HAS_SUB_NODE flag in an INDEX_ENTRY within a directory's INDEX_ALLOCATION block and manipulating the VCN pointer, an attacker can cause the indx_find() function to repeatedly read the same block, allocating 4 KB of memory each time. The kernel lacks VCN loop detection and depth limits, causing memory exhaustion and an OOM crash.
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This patch adds a return value check for fnd_push() to prevent a memory exhaustion vulnerability caused by infinite loops. When the index exceeds the size of the fnd->nodes array, fnd_push() returns -EINVAL. The indx_find() function checks this return value and stops processing, preventing further memory allocation.
CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Puntuación base: 5.5
Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.12%
Percentil entre todas las CVEs puntuadas: 2
Fecha de la puntuación: 6/10/2026
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

CWE-835
Referencias

JSON original (NVD)

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          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
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      "source": "nvd@nist.gov",
      "description": [
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          "lang": "en",
          "value": "CWE-835"
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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs: ntfs3: check return value of indx_find to avoid infinite loop\n\nWe found an infinite loop bug in the ntfs3 file system that can lead to a\nDenial-of-Service (DoS) condition.\n\nA malformed dentry in the ntfs3 filesystem can cause the kernel to hang\nduring the lookup operations. By setting the HAS_SUB_NODE flag in an\nINDEX_ENTRY within a directory's INDEX_ALLOCATION block and manipulating the\nVCN pointer, an attacker can cause the indx_find() function to repeatedly\nread the same block, allocating 4 KB of memory each time. The kernel lacks\nVCN loop detection and depth limits, causing memory exhaustion and an OOM\ncrash.\n\nThis patch adds a return value check for fnd_push() to prevent a memory\nexhaustion vulnerability caused by infinite loops. When the index exceeds the\nsize of the fnd->nodes array, fnd_push() returns -EINVAL. The indx_find()\nfunction checks this return value and stops processing, preventing further\nmemory allocation."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nfs: ntfs3: verificar el valor de retorno de indx_find para evitar un bucle infinito\n\nHemos encontrado un error de bucle infinito en el sistema de archivos ntfs3 que puede conducir a una condición de Denegación de Servicio (DoS).\n\nUna entrada de directorio (dentry) malformada en el sistema de archivos ntfs3 puede hacer que el kernel se cuelgue durante las operaciones de búsqueda. Al establecer la bandera HAS_SUB_NODE en una INDEX_ENTRY dentro del bloque INDEX_ALLOCATION de un directorio y manipular el puntero VCN, un atacante puede hacer que la función indx_find() lea repetidamente el mismo bloque, asignando 4 KB de memoria cada vez. El kernel carece de detección de bucles VCN y límites de profundidad, causando agotamiento de memoria y un fallo OOM.\n\nEste parche añade una verificación del valor de retorno para fnd_push() para prevenir una vulnerabilidad de agotamiento de memoria causada por bucles infinitos. Cuando el índice excede el tamaño del array fnd-&gt;nodes, fnd_push() devuelve -EINVAL. La función indx_find() verifica este valor de retorno y detiene el procesamiento, evitando una mayor asignación de memoria."
    }
  ],
  "lastModified": "2026-07-14T13:18:06.163",
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