CVE-2026-72395

hwmon: (pmbus) Fix passing events to regulator core

State: Published
Severity: 7.1 High
Published: Aug 15, 2026
Updated: Oct 30, 2026
Reserved: Aug 9, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.1 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	b26849cffaa7c43355b82e9bef3725e786973a1a to before 2106bf4056858fcce3624e0c51f6fee4d41d3f2fAffected acf04e2863132f6d9222f71f3a76fb9782cbe061 to before 48fe43666950efefb7ac5fbdc012c1b3604096bfAffected 4e9d723d9f198b86f6882a84c501ba1f39e8d055 to before 489291b6b56978cc50d34e8e13f9636ea296ba8aAffected 754bd2b4a084b90b5e7b630e1f423061a9b9b761 to before b0ff6b6ae9c5183ef701ece7016698bde5a5bfbaAffected 754bd2b4a084b90b5e7b630e1f423061a9b9b761 to before 9ef7dacd44216bf5ea05c8aef49eba4d145f4047Affected f0c9ea9c3a208e79c812e10e2bcef87b46564f01Affected 2c77ae315f3ce9d2c8e1609be74c9358c1fe4e07Affected 6.6.143 to before 6.6.145Affected 6.12.92 to before 6.12.97Affected 6.18.21 to before 6.18.40Affected 6.1.191 to before 6.2Affected 6.19.11 to before 6.20Affected
LinuxLinux	7.0Affected before 7.0Not affected 6.6.145 through 6.6.Not affected 6.12.97 through 6.12.Not affected 6.18.40 through 6.18.Not affected 7.1.5 through 7.1.Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

b26849cffaa7c43355b82e9bef3725e786973a1a to before 2106bf4056858fcce3624e0c51f6fee4d41d3f2fAffected
acf04e2863132f6d9222f71f3a76fb9782cbe061 to before 48fe43666950efefb7ac5fbdc012c1b3604096bfAffected
4e9d723d9f198b86f6882a84c501ba1f39e8d055 to before 489291b6b56978cc50d34e8e13f9636ea296ba8aAffected
754bd2b4a084b90b5e7b630e1f423061a9b9b761 to before b0ff6b6ae9c5183ef701ece7016698bde5a5bfbaAffected
754bd2b4a084b90b5e7b630e1f423061a9b9b761 to before 9ef7dacd44216bf5ea05c8aef49eba4d145f4047Affected
f0c9ea9c3a208e79c812e10e2bcef87b46564f01Affected
2c77ae315f3ce9d2c8e1609be74c9358c1fe4e07Affected
6.6.143 to before 6.6.145Affected
6.12.92 to before 6.12.97Affected
6.18.21 to before 6.18.40Affected
6.1.191 to before 6.2Affected
6.19.11 to before 6.20Affected

LinuxLinux

7.0Affected
before 7.0Not affected
6.6.145 through 6.6.*Not affected
6.12.97 through 6.12.*Not affected
6.18.40 through 6.18.*Not affected
7.1.5 through 7.1.*Not affected
7.2 and laterNot affected

References

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