CVE-2025-71111None▾ SunlitIn 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 sh…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.1%
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.
Linux >= 9873964d6eb24bd0205394f9b791de9eddbcb855 < 3dceb68f6ad33156032ef4da21a93d84059cca6dLinux >= 9873964d6eb24bd0205394f9b791de9eddbcb855 < bf5b03227f2e6d4360004886d268f9df8993ef8fLinux >= 9873964d6eb24bd0205394f9b791de9eddbcb855 < f2b579a0c37c0df19603d719894a942a295f634aLinux >= 9873964d6eb24bd0205394f9b791de9eddbcb855 < f94800fbc26ccf7c81eb791707b038a57aa39a18Linux >= 9873964d6eb24bd0205394f9b791de9eddbcb855 < a9fb6e8835a22f5796c1182ed612daed3fd273afLinux >= 9873964d6eb24bd0205394f9b791de9eddbcb855 < c8cf0c2bdcccc6634b6915ff793b844e12436680Linux >= 9873964d6eb24bd0205394f9b791de9eddbcb855 < 670d7ef945d3a84683594429aea6ab2cdfa5ceb4Linux 2.6.18Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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