Riskcovery

CVE-2025-71111

hwmon: (w83791d) Convert macros to functions to avoid TOCTOU

State
Published
Severity
Not scored
Published
Jan 14, 2026
Updated
Oct 19, 2026
Reserved
Jan 13, 2026

Read the record on cve.org

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.

Scores

The record has no CVSS score.

Weaknesses

  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Affected Products

ProductVersions
LinuxLinux
  • 9873964d6eb24bd0205394f9b791de9eddbcb855 to before 3dceb68f6ad33156032ef4da21a93d84059cca6dAffected
  • 9873964d6eb24bd0205394f9b791de9eddbcb855 to before bf5b03227f2e6d4360004886d268f9df8993ef8fAffected
  • 9873964d6eb24bd0205394f9b791de9eddbcb855 to before f2b579a0c37c0df19603d719894a942a295f634aAffected
  • 9873964d6eb24bd0205394f9b791de9eddbcb855 to before f94800fbc26ccf7c81eb791707b038a57aa39a18Affected
  • 9873964d6eb24bd0205394f9b791de9eddbcb855 to before a9fb6e8835a22f5796c1182ed612daed3fd273afAffected
  • 9873964d6eb24bd0205394f9b791de9eddbcb855 to before c8cf0c2bdcccc6634b6915ff793b844e12436680Affected
  • 9873964d6eb24bd0205394f9b791de9eddbcb855 to before 670d7ef945d3a84683594429aea6ab2cdfa5ceb4Affected
LinuxLinux
  • 2.6.18Affected
  • before 2.6.18Not affected
  • 5.10.248 through 5.10.*Not affected
  • 5.15.198 through 5.15.*Not affected
  • 6.1.160 through 6.1.*Not affected
  • 6.6.120 through 6.6.*Not affected
  • 6.12.64 through 6.12.*Not affected
  • 6.18.3 through 6.18.*Not affected
  • 6.19 and laterNot affected

References

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