CVE-2025-71111 (GCVE-0-2025-71111)

Vulnerability from cvelistv5 – Published: 2026-01-14 15:05 – Updated: 2026-10-19 18:15
VLAI
Title
hwmon: (w83791d) Convert macros to functions to avoid TOCTOU
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.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-10 20:42 UTC
CWE
  • CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7018 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 9873964d6eb24bd0205394f9b791de9eddbcb855 , < 3dceb68f6ad33156032ef4da21a93d84059cca6d (git)
Affected: 9873964d6eb24bd0205394f9b791de9eddbcb855 , < bf5b03227f2e6d4360004886d268f9df8993ef8f (git)
Affected: 9873964d6eb24bd0205394f9b791de9eddbcb855 , < f2b579a0c37c0df19603d719894a942a295f634a (git)
Affected: 9873964d6eb24bd0205394f9b791de9eddbcb855 , < f94800fbc26ccf7c81eb791707b038a57aa39a18 (git)
Affected: 9873964d6eb24bd0205394f9b791de9eddbcb855 , < a9fb6e8835a22f5796c1182ed612daed3fd273af (git)
Affected: 9873964d6eb24bd0205394f9b791de9eddbcb855 , < c8cf0c2bdcccc6634b6915ff793b844e12436680 (git)
Affected: 9873964d6eb24bd0205394f9b791de9eddbcb855 , < 670d7ef945d3a84683594429aea6ab2cdfa5ceb4 (git)
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Linux Linux Affected: 2.6.18
Unaffected: 0 , < 2.6.18 (semver)
Unaffected: 5.10.248 , ≤ 5.10.* (semver)
Unaffected: 5.15.198 , ≤ 5.15.* (semver)
Unaffected: 6.1.160 , ≤ 6.1.* (semver)
Unaffected: 6.6.120 , ≤ 6.6.* (semver)
Unaffected: 6.12.64 , ≤ 6.12.* (semver)
Unaffected: 6.18.3 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
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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 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",
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                "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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      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2025-71111.json",
      "version": "37"
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}



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