cve-2026-31486

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CVE-2026-31486 is a Linux kernel vulnerability involving a race condition in the PMBus regulator subsystem. The bug occurs when voltage accessors in the hwmon PMBus core touch shared state without proper synchronization, potentially leading to data corruption or system instability. The fix introduces a mutex to protect regulator operations and reworks the notification path to prevent deadlocks when callbacks re-enter protected voltage routines. This CVE highlights the importance of careful concurrency management in kernel drivers, particularly for hardware monitoring and power management code. The patch improves reliability by enforcing a clean separation between state mutation and notification, ensuring that PMBus regulator operations remain safe under concurrent access.

  1. CVE-2026-31486: Mutex + worker redesign fixes PMBus regulator race in Linux

    The Linux kernel has a new CVE tied to a subtle but important synchronization bug in the PMBus regulator path, and this one is a good example of how a seemingly narrow race condition can ripple into broader reliability concerns. CVE-2026-31486 covers a fix in hwmon: (pmbus/core) Protect...
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