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CVE-2025-21661

Estado: ModificadaMedia (5.5)—

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

gpio: virtuser: fix missing lookup table cleanups

When a virtuser device is created via configfs and the probe fails due to an incorrect lookup table, the table is not removed. This prevents subsequent probe attempts from succeeding, even if the issue is corrected, unless the device is released. Additionally, cleanup is also needed in the less likely case of platform_device_register_full() failure.

Besides, a consistent memory leak in lookup_table->dev_id was spotted using kmemleak by toggling the live state between 0 and 1 with a correct lookup table.

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Introduce gpio_virtuser_remove_lookup_table() as the counterpart to the existing gpio_virtuser_make_lookup_table() and call it from all necessary points to ensure proper cleanup.

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).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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          "options": [
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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngpio: virtuser: fix missing lookup table cleanups\n\nWhen a virtuser device is created via configfs and the probe fails due\nto an incorrect lookup table, the table is not removed. This prevents\nsubsequent probe attempts from succeeding, even if the issue is\ncorrected, unless the device is released. Additionally, cleanup is also\nneeded in the less likely case of platform_device_register_full()\nfailure.\n\nBesides, a consistent memory leak in lookup_table->dev_id was spotted\nusing kmemleak by toggling the live state between 0 and 1 with a correct\nlookup table.\n\nIntroduce gpio_virtuser_remove_lookup_table() as the counterpart to the\nexisting gpio_virtuser_make_lookup_table() and call it from all\nnecessary points to ensure proper cleanup."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: gpio: virtuser: corregir limpiezas de tablas de búsqueda faltantes Cuando se crea un dispositivo virtuser a través de configfs y la sonda falla debido a una tabla de búsqueda incorrecta, la tabla no se elimina. Esto evita que los intentos de sonda posteriores tengan éxito, incluso si se corrige el problema, a menos que se libere el dispositivo. Además, también se necesita limpieza en el caso menos probable de que falle platform_device_register_full(). Además, se detectó una pérdida de memoria constante en lookup_table->dev_id usando kmemleak alternando el estado activo entre 0 y 1 con una tabla de búsqueda correcta. Introduzca gpio_virtuser_remove_lookup_table() como contraparte del gpio_virtuser_make_lookup_table() existente y llámelo desde todos los puntos necesarios para garantizar una limpieza adecuada. "
    }
  ],
  "lastModified": "2026-07-30T06:17:41.783",
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