CVE-2025-71111

MediumCVSS 4.7/10Last modified Oct 19, 2026

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.

Metrics

CVSS 3.1 4.7/10CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-367CWE-362

Affected software

VendorProductVersions
LinuxLinux>= 9873964d6eb24bd0205394f9b791de9eddbcb855, < 3dceb68f6ad33156032ef4da21a93d84059cca6d; >= 9873964d6eb24bd0205394f9b791de9eddbcb855, < bf5b03227f2e6d4360004886d268f9df8993ef8f; >= 9873964d6eb24bd0205394f9b791de9eddbcb855, < f2b579a0c37c0df19603d719894a942a295f634a; >= 9873964d6eb24bd0205394f9b791de9eddbcb855, < f94800fbc26ccf7c81eb791707b038a57aa39a18; >= 9873964d6eb24bd0205394f9b791de9eddbcb855, < a9fb6e8835a22f5796c1182ed612daed3fd273af; >= 9873964d6eb24bd0205394f9b791de9eddbcb855, < c8cf0c2bdcccc6634b6915ff793b844e12436680; >= 9873964d6eb24bd0205394f9b791de9eddbcb855, < 670d7ef945d3a84683594429aea6ab2cdfa5ceb4
LinuxLinux2.6.18

References

Timeline

Published
Jan 14, 2026
Last modified
Oct 19, 2026
NVD status
Modified

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CVE-2025-71111: Medium severity, CVSS 4.7 | Vulnix