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CVE-2025-38172

Estado: ModificadaAlta (7.8)—

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

erofs: avoid using multiple devices with different type

For multiple devices, both primary and extra devices should be the same type. `erofs_init_device` has already guaranteed that if the primary is a file-backed device, extra devices should also be regular files.

However, if the primary is a block device while the extra device is a file-backed device, `erofs_init_device` will get an ENOTBLK, which is not treated as an error in `erofs_fc_get_tree`, and that leads to an UAF:

So if -ENOTBLK is hitted in `erofs_init_device`, it means the primary device must be a block device, and the extra device is not a block device. The error can be converted to -EINVAL.

Detalles técnicos trazas, registros y código del informe original
  erofs_fc_get_tree
    get_tree_bdev_flags(erofs_fc_fill_super)
      erofs_read_superblock
        erofs_init_device  // sbi->dif0 is not inited yet,
                           // return -ENOTBLK
      deactivate_locked_super
        free(sbi)
    if (err is -ENOTBLK)
      sbi->dif0.file = filp_open()  // sbi UAF

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vulnerabilidad UAF en kernel Linux tras fallar inicialización de dispositivo con privilegios locales (PR:L), permitiendo ejecución de código. CWE-416 (use-after-free) en contexto de acceso a archivo de dispositivo.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Execution PreventionThreat Intelligence ProgramRestrict Web-Based ContentPrivileged Account ManagementLimit Software InstallationBehavior Prevention on Endpoint

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

Mostrar
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          "value": "CWE-416"
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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: avoid using multiple devices with different type\n\nFor multiple devices, both primary and extra devices should be the\nsame type. `erofs_init_device` has already guaranteed that if the\nprimary is a file-backed device, extra devices should also be\nregular files.\n\nHowever, if the primary is a block device while the extra device\nis a file-backed device, `erofs_init_device` will get an ENOTBLK,\nwhich is not treated as an error in `erofs_fc_get_tree`, and that\nleads to an UAF:\n\n  erofs_fc_get_tree\n    get_tree_bdev_flags(erofs_fc_fill_super)\n      erofs_read_superblock\n        erofs_init_device  // sbi->dif0 is not inited yet,\n                           // return -ENOTBLK\n      deactivate_locked_super\n        free(sbi)\n    if (err is -ENOTBLK)\n      sbi->dif0.file = filp_open()  // sbi UAF\n\nSo if -ENOTBLK is hitted in `erofs_init_device`, it means the\nprimary device must be a block device, and the extra device\nis not a block device. The error can be converted to -EINVAL."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: erofs: evitar el uso de múltiples dispositivos con diferentes tipos Para múltiples dispositivos, tanto los dispositivos principales como los adicionales deben ser del mismo tipo. `erofs_init_device` ya ha garantizado que si el principal es un dispositivo respaldado por archivos, los dispositivos adicionales también deben ser archivos normales. Sin embargo, si el dispositivo principal es un dispositivo de bloque mientras que el dispositivo adicional es un dispositivo respaldado por archivo, `erofs_init_device` obtendrá un ENOTBLK, que no se trata como un error en `erofs_fc_get_tree`, y eso lleva a un UAF: erofs_fc_get_tree get_tree_bdev_flags(erofs_fc_fill_super) erofs_read_superblock erofs_init_device // sbi->dif0 aún no se ha inicializado, // return -ENOTBLK deactivate_locked_super free(sbi) if (err is -ENOTBLK) sbi->dif0.file = filp_open() // sbi UAF Entonces, si se alcanza -ENOTBLK en `erofs_init_device`, significa que el dispositivo principal debe ser un dispositivo de bloque y el dispositivo adicional no es un dispositivo de bloque. El error se puede convertir a -EINVAL."
    }
  ],
  "lastModified": "2026-07-30T06:22:56.830",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "versionEndExcluding": "6.12.34",
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            {
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}