CVE-2025-71111

Description

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.

PUBLISHED Reserved 2026-01-13 | Published 2026-01-14 | Updated 2026-02-09 | Assigner Linux

Product status

References

git.kernel.org/...c/3dceb68f6ad33156032ef4da21a93d84059cca6d

git.kernel.org/...c/bf5b03227f2e6d4360004886d268f9df8993ef8f

git.kernel.org/...c/f2b579a0c37c0df19603d719894a942a295f634a

git.kernel.org/...c/f94800fbc26ccf7c81eb791707b038a57aa39a18

git.kernel.org/...c/a9fb6e8835a22f5796c1182ed612daed3fd273af

git.kernel.org/...c/c8cf0c2bdcccc6634b6915ff793b844e12436680

git.kernel.org/...c/670d7ef945d3a84683594429aea6ab2cdfa5ceb4

cve.org (CVE-2025-71111)

nvd.nist.gov (CVE-2025-71111)

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