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CVE-2025-71111

Estado: AnalizadaMedia (4.7)—

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

hwmon: (w83791d) Convert macros to functions to avoid TOCTOU

The macro FAN_FROM_REG evaluates its arguments multiple times. When used in lockless contexts involving shared driver data, this leads to Time-of-Check to Time-of-Use (TOCTOU) race conditions, potentially causing divide-by-zero errors.

Convert the macro to a static function. This guarantees that arguments are evaluated only once (pass-by-value), preventing the race conditions.

Additionally, in store_fan_div, move the calculation of the minimum limit inside the update lock. This ensures that the read-modify-write sequence operates on consistent data.

Leer descripción completaMostrar menos

Adhere to the principle of minimal changes by only converting macros that evaluate arguments multiple times and are used in lockless contexts.

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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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (w83791d) Convert macros to functions to avoid TOCTOU\n\nThe macro FAN_FROM_REG evaluates its arguments multiple times. When used\nin lockless contexts involving shared driver data, this leads to\nTime-of-Check to Time-of-Use (TOCTOU) race conditions, potentially\ncausing divide-by-zero errors.\n\nConvert the macro to a static function. This guarantees that arguments\nare evaluated only once (pass-by-value), preventing the race\nconditions.\n\nAdditionally, in store_fan_div, move the calculation of the minimum\nlimit inside the update lock. This ensures that the read-modify-write\nsequence operates on consistent data.\n\nAdhere to the principle of minimal changes by only converting macros\nthat evaluate arguments multiple times and are used in lockless\ncontexts."
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      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nhwmon: (w83791d) Convertir macros a funciones para evitar TOCTOU\n\nLa macro FAN_FROM_REG evalúa sus argumentos múltiples veces. Cuando se usa en contextos sin bloqueo que involucran datos de controlador compartidos, esto lleva a condiciones de carrera de Tiempo de Verificación a Tiempo de Uso (TOCTOU), potencialmente causando errores de división por cero.\n\nConvertir la macro a una función estática. Esto garantiza que los argumentos se evalúen solo una vez (paso por valor), previniendo las condiciones de carrera.\n\nAdemás, en store_fan_div, mover el cálculo del límite mínimo dentro del bloqueo de actualización. Esto asegura que la secuencia de lectura-modificación-escritura opere con datos consistentes.\n\nAdherirse al principio de cambios mínimos al convertir solo macros que evalúan argumentos múltiples veces y se usan en contextos sin bloqueo."
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  "lastModified": "2026-06-17T10:03:41.140",
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