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CVE-2026-31486 affects the Linux kernel hwmon PMBus core. The regulator operations pmbus_regulator_get_voltage(), pmbus_regulator_set_voltage(), and pmbus_regulator_list_voltage() access PMBus registers and shared data without being protected by the update_lock mutex, creating a race condition in concurrent execution paths. The upstream fix adds synchronization for these regulator operations and reworks pmbus_regulator_notify() so notifications are deferred to a worker and delivered outside the mutex-protected section, avoiding a deadlock scenario where regulator callbacks could re-enter the protected voltage functions while the same mutex is already held. Events are tracked in per-page atomic bitmasks and processed asynchronously by the worker.
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Cross-references every affected SKU, including bundled OEM variants.
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