CVE-2025-71111

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A Time-of-Check to Time-of-Use (TOCTOU) race condition exists in the Linux kernel due to the repeated evaluation of arguments within the FAN FROM REG macro. This can lead to divide-by-zero errors when used in lockless contexts with shared driver data. The issue is addressed by converting the macro to a static function, ensuring arguments are evaluated only once. Additionally, the calculation within store fan div is moved inside the update lock to maintain data consistency during read-modify-write operations. The fix adheres to minimal changes, focusing only on macros that evaluate arguments multiple times in lockless contexts.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.