FKIE_CVE-2025-71111

Vulnerability from fkie_nvd - Published: 2026-01-14 15:16 - Updated: 2026-03-25 19:27
Severity
4.7 (Medium) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
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. Adhere to the principle of minimal changes by only converting macros that evaluate arguments multiple times and are used in lockless contexts.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3dceb68f6ad33156032ef4da21a93d84059cca6dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/670d7ef945d3a84683594429aea6ab2cdfa5ceb4Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a9fb6e8835a22f5796c1182ed612daed3fd273afPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bf5b03227f2e6d4360004886d268f9df8993ef8fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c8cf0c2bdcccc6634b6915ff793b844e12436680Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f2b579a0c37c0df19603d719894a942a295f634aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f94800fbc26ccf7c81eb791707b038a57aa39a18Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 2.6.18
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
To clipboard 

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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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      "lang": "es",
      "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 eval\u00faa sus argumentos m\u00faltiples veces. Cuando se usa en contextos sin bloqueo que involucran datos de controlador compartidos, esto lleva a condiciones de carrera de Tiempo de Verificaci\u00f3n a Tiempo de Uso (TOCTOU), potencialmente causando errores de divisi\u00f3n por cero.\n\nConvertir la macro a una funci\u00f3n est\u00e1tica. Esto garantiza que los argumentos se eval\u00faen solo una vez (paso por valor), previniendo las condiciones de carrera.\n\nAdem\u00e1s, en store_fan_div, mover el c\u00e1lculo del l\u00edmite m\u00ednimo dentro del bloqueo de actualizaci\u00f3n. Esto asegura que la secuencia de lectura-modificaci\u00f3n-escritura opere con datos consistentes.\n\nAdherirse al principio de cambios m\u00ednimos al convertir solo macros que eval\u00faan argumentos m\u00faltiples veces y se usan en contextos sin bloqueo."
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  "id": "CVE-2025-71111",
  "lastModified": "2026-03-25T19:27:20.137",
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          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 4.7,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
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  "published": "2026-01-14T15:16:00.193",
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