hwmon: (pmbus/core) Protect regulator operations with mutex

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Summary

CVECVE-2026-31486
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-22 14:16:46 UTC
Updated2026-04-22 14:16:46 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ddbb4db4ced1ba784fcd3500179a7291b6c5d7b7 4e9d723d9f198b86f6882a84c501ba1f39e8d055 git Not specified
CNA Linux Linux affected ddbb4db4ced1ba784fcd3500179a7291b6c5d7b7 2c77ae315f3ce9d2c8e1609be74c9358c1fe4e07 git Not specified
CNA Linux Linux affected ddbb4db4ced1ba784fcd3500179a7291b6c5d7b7 754bd2b4a084b90b5e7b630e1f423061a9b9b761 git Not specified
CNA Linux Linux affected 3.19 Not specified
CNA Linux Linux unaffected 3.19 semver Not specified
CNA Linux Linux unaffected 6.18.21 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.11 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/754bd2b4a084b90b5e7b630e1f423061a9b9b761 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2c77ae315f3ce9d2c8e1609be74c9358c1fe4e07 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4e9d723d9f198b86f6882a84c501ba1f39e8d055 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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