CVE-2026-31486
HighCVSS 7.1Exploitation Probability (EPSS)
Low risk1th percentile - higher than 1% of all known CVEs
Summary
A vulnerability has been identified in the Linux kernel related to regulator operations in the hwmon (pmbus/core) module, which were not protected by a mutex, potentially leading to race conditions. The pmbus_regulator_notify() function has been modified to use a worker function to send notifications outside of mutex protection.
Risk Assessment
The lack of proper mutex protection may lead to unpredictable system behavior, jeopardizing the stability and security of voltage regulation operations.
Recommendation
It is recommended to update the Linux kernel to a version that includes fixes for this vulnerability to ensure proper protection of regulator operations.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: hwmon: (pmbus/core) Protect regulator operations with mutex The regulator operations pmbus_regulator_get_voltage(), pmbus_regulator_set_voltage(), and pmbus_regulator_list_voltage() access PMBus registers and shared data but were not protected by the update_lock mutex. This could lead to race conditions. However, adding mutex protection directly to these functions causes a deadlock because pmbus_regulator_notify() (which calls regulator_notifier_call_chain()) is often called with the mutex already held (e.g., from pmbus_fault_handler()). If a regulator callback then calls one of the now-protected voltage functions, it will attempt to acquire the same mutex. Rework pmbus_regulator_notify() to utilize a worker function to send notifications outside of the mutex protection. Events are stored as atomics in a per-page bitmask and processed by the worker. Initialize the worker and its associated data during regulator registration, and ensure it is cancelled on device removal using devm_add_action_or_reset(). While at it, remove the unnecessary include of linux/of.h.