CVE-2025-71267

Estado: ModificadaMedia (5.5)—

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

fs: ntfs3: fix infinite loop triggered by zero-sized ATTR_LIST

We found an infinite loop bug in the ntfs3 file system that can lead to a Denial-of-Service (DoS) condition.

A malformed NTFS image can cause an infinite loop when an ATTR_LIST attribute indicates a zero data size while the driver allocates memory for it.

When ntfs_load_attr_list() processes a resident ATTR_LIST with data_size set to zero, it still allocates memory because of al_aligned(0).

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This creates an inconsistent state where ni->attr_list.size is zero, but ni->attr_list.le is non-null. This causes ni_enum_attr_ex to incorrectly assume that no attribute list exists and enumerates only the primary MFT record. When it finds ATTR_LIST, the code reloads it and restarts the enumeration, repeating indefinitely. The mount operation never completes, hanging the kernel thread.

This patch adds validation to ensure that data_size is non-zero before memory allocation. When a zero-sized ATTR_LIST is detected, the function returns -EINVAL, preventing a DoS vulnerability.

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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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs: ntfs3: fix infinite loop triggered by zero-sized ATTR_LIST\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 NTFS image can cause an infinite loop when an ATTR_LIST attribute\nindicates a zero data size while the driver allocates memory for it.\n\nWhen ntfs_load_attr_list() processes a resident ATTR_LIST with data_size set\nto zero, it still allocates memory because of al_aligned(0). This creates an\ninconsistent state where ni->attr_list.size is zero, but ni->attr_list.le is\nnon-null. This causes ni_enum_attr_ex to incorrectly assume that no attribute\nlist exists and enumerates only the primary MFT record. When it finds\nATTR_LIST, the code reloads it and restarts the enumeration, repeating\nindefinitely. The mount operation never completes, hanging the kernel thread.\n\nThis patch adds validation to ensure that data_size is non-zero before memory\nallocation. When a zero-sized ATTR_LIST is detected, the function returns\n-EINVAL, preventing a DoS vulnerability."
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    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nfs: ntfs3: corrige bucle infinito provocado por ATTR_LIST de tamaño cero\n\nSe encontró un error de bucle infinito en el sistema de archivos ntfs3 que puede llevar a una condición de Denegación de Servicio (DoS).\n\nUna imagen NTFS malformada puede causar un bucle infinito cuando un atributo ATTR_LIST indica un tamaño de datos cero mientras el controlador asigna memoria para ello.\n\nCuando ntfs_load_attr_list() procesa un ATTR_LIST residente con data_size establecido en cero, todavía asigna memoria debido a al_aligned(0). Esto crea un estado inconsistente donde ni-&gt;attr_list.size es cero, pero ni-&gt;attr_list.le no es nulo. Esto hace que ni_enum_attr_ex asuma incorrectamente que no existe ninguna lista de atributos y enumere solo el registro MFT primario. Cuando encuentra ATTR_LIST, el código lo recarga y reinicia la enumeración, repitiéndose indefinidamente. La operación de montaje nunca se completa, colgando el hilo del kernel.\n\nEste parche añade validación para asegurar que data_size no sea cero antes de la asignación de memoria. Cuando se detecta un ATTR_LIST de tamaño cero, la función devuelve -EINVAL, previniendo una vulnerabilidad de DoS."
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  "lastModified": "2026-07-14T13:18:06.330",
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