In the Linux kernel, the following vulnerability has been resolved: hwmon: (pmbus) Fix passing...
🔗 CVE IDs covered (1)
📋 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.
🔗 References (7)
- https://nvd.nist.gov/vuln/detail/CVE-2026-72395
- 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
- https://github.com/advisories/GHSA-w4gm-vhrh-5h95