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.

https://git.kernel.org/stable/c/2106bf4056858fcce3624e0c51f6fee4d41d3f2f

https://git.kernel.org/stable/c/489291b6b56978cc50d34e8e13f9636ea296ba8a

https://git.kernel.org/stable/c/48fe43666950efefb7ac5fbdc012c1b3604096bf

https://git.kernel.org/stable/c/9ef7dacd44216bf5ea05c8aef49eba4d145f4047

https://git.kernel.org/stable/c/b0ff6b6ae9c5183ef701ece7016698bde5a5bfba

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