CyberRota Analysis
AI-GeneratedThe vulnerability affects the Linux kernel's hwmon subsystem, specifically in the handling of regulator events where multiple distinct faults can lead to critical protection mechanisms being bypassed. This flaw could result in inadequate responses to critical hardware conditions, potentially causing system instability or damage. Organizations using Linux-based systems, particularly those reliant on hardware monitoring and regulation, should prioritize addressing this issue to ensure robust operational integrity.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: hwmon: (pmbus) Fix passing events to regulator core Sashiko reports: Commit 754bd2b4a084 ("hwmon: (pmbus/core) Protect regulator operations with mutex") introduced a worker to batch regulator events over time using atomic_or(). The delayed worker then passes the combined bitmask unmodified to regulator_notifier_call_chain(). The core regulator subsystem's regulator_handle_critical() function evaluates the event parameter using a strict switch statement. If multiple distinct faults occur before the worker runs (e.g., REGULATOR_EVENT_UNDER_VOLTAGE | REGULATOR_EVENT_OVER_CURRENT), the combined bitmask fails to match any case. This leaves the reason as NULL and completely bypasses the critical hw_protection_trigger(). Fix the problem by passing events bit by bit to the regulator event handler.