CVE-2026-72395

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxb26849cffaa7c43355b82e9bef3725e786973a1a < 2106bf4056858fcce3624e0c51f6fee4d41d3f2faffected
LinuxLinuxacf04e2863132f6d9222f71f3a76fb9782cbe061 < 48fe43666950efefb7ac5fbdc012c1b3604096bfaffected
LinuxLinux4e9d723d9f198b86f6882a84c501ba1f39e8d055 < 489291b6b56978cc50d34e8e13f9636ea296ba8aaffected
LinuxLinux754bd2b4a084b90b5e7b630e1f423061a9b9b761 < b0ff6b6ae9c5183ef701ece7016698bde5a5bfbaaffected
LinuxLinux754bd2b4a084b90b5e7b630e1f423061a9b9b761 < 9ef7dacd44216bf5ea05c8aef49eba4d145f4047affected
LinuxLinux2c77ae315f3ce9d2c8e1609be74c9358c1fe4e07affected
LinuxLinux6.6.143 < 6.6.145affected
LinuxLinux6.12.92 < 6.12.97affected
LinuxLinux6.18.21 < 6.18.40affected
LinuxLinux6.19.11 < 6.20affected
LinuxLinux7.0affected
LinuxLinux0 < 7.0unaffected
LinuxLinux6.6.145 <= 6.6.*unaffected
LinuxLinux6.12.97 <= 6.12.*unaffected
LinuxLinux6.18.40 <= 6.18.*unaffected
LinuxLinux7.1.5 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References