FKIE_CVE-2025-71266

Vulnerability from fkie_nvd - Published: 2026-03-18 11:16 - Updated: 2026-03-18 14:52
Severity ?
Summary
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. 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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0ad7a1be44479503dbe5c699759861ef5b8bd70c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/14c3188afbedfd5178bbabb8002487ea14b37b56
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1732053c8a6b360e2d5afb1b34fe9779398b072c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/398e768d1accd1f5645492ab996005d7aa84a5b0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/435d34719db0e130f6f0c621d67ed524cc1a7d10
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/68e32694be231c1cdb99b7637a657314e88e1a96
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b0ea441f44ce64fa514a415d4a9e6e2b06e7946c
Impacted products
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{
  "cveTags": [],
  "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\u0027s 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-\u003enodes 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 condici\u00f3n de Denegaci\u00f3n 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 b\u00fasqueda. 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 funci\u00f3n indx_find() lea repetidamente el mismo bloque, asignando 4 KB de memoria cada vez. El kernel carece de detecci\u00f3n de bucles VCN y l\u00edmites de profundidad, causando agotamiento de memoria y un fallo OOM.\n\nEste parche a\u00f1ade una verificaci\u00f3n del valor de retorno para fnd_push() para prevenir una vulnerabilidad de agotamiento de memoria causada por bucles infinitos. Cuando el \u00edndice excede el tama\u00f1o del array fnd-\u0026gt;nodes, fnd_push() devuelve -EINVAL. La funci\u00f3n indx_find() verifica este valor de retorno y detiene el procesamiento, evitando una mayor asignaci\u00f3n de memoria."
    }
  ],
  "id": "CVE-2025-71266",
  "lastModified": "2026-03-18T14:52:44.227",
  "metrics": {},
  "published": "2026-03-18T11:16:15.560",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0ad7a1be44479503dbe5c699759861ef5b8bd70c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/14c3188afbedfd5178bbabb8002487ea14b37b56"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1732053c8a6b360e2d5afb1b34fe9779398b072c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/398e768d1accd1f5645492ab996005d7aa84a5b0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/435d34719db0e130f6f0c621d67ed524cc1a7d10"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/68e32694be231c1cdb99b7637a657314e88e1a96"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b0ea441f44ce64fa514a415d4a9e6e2b06e7946c"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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