CVE-2026-72395

/// Technical 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.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References