power: supply: charger-manager: register regulators before exposing sysfs

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Summary

CVECVE-2026-89472
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:28 UTC
Updated2026-09-11 20:19:28 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: power: supply: charger-manager: register regulators before exposing sysfs charger_manager_remove() and the err_reg_extcon probe error path free each charger regulator with regulator_put() before tearing down the power_supply sysfs entries (power_supply_unregister()). charger_manager_remove() also calls try_charger_enable(cm, false) after the regulator_put() loop. A concurrent write to a charger's externally_control sysfs attribute that lands between regulator_put() and power_supply_unregister() can run charger_externally_control_store() and call try_charger_enable(), which, when charging is enabled, dereferences the already-freed consumer handle. When charging is enabled, try_charger_enable(cm, false) in .remove() also dereferences the freed handles directly. Both leave use-after-free windows. Symmetrically, probe registers the sysfs entries (power_supply_register) before acquiring the regulators (regulator_get, inside charger_manager_register_extcon), so userspace can reach externally_control before the regulators are available. Split charger_manager_register_extcon() on the sync/async boundary: charger_manager_get_regulators() (regulator_get only, no async producer) now runs before power_supply_register() so sysfs is not live before regulators are available, and charger_manager_register_extcon() keeps only the extcon notifier/work setup, still after power_supply_register() so a power_supply_register() failure cannot reach extcon setup. This keeps the sysfs setup/teardown ordering symmetric without introducing an asynchronous producer on the earlier probe-error path. Move power_supply_unregister() and try_charger_enable(cm, false) ahead of the regulator_put() loop on both teardown paths, and adjust err_reg_extcon (power_supply_unregister() then fall through err_regulator for regulator_put(); get_regulators self-rolls back on its own failure). This does not address the separate extcon-notifier-driven deref of the same handles, which needs its own synchronization design. Found by an in-house static analysis tool.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 3950c7865cd7c963982a2c94457182b96732f4c9 af3ce383ba0d0d48957a22ac7058ff5698775898 git Not specified
CNA Linux Linux affected 3950c7865cd7c963982a2c94457182b96732f4c9 86e4fa65368f3bbb506dddba8c9eedc75bd603b2 git Not specified
CNA Linux Linux affected 3950c7865cd7c963982a2c94457182b96732f4c9 6d532582ff3c420598f02945b13184c738cc1581 git Not specified
CNA Linux Linux affected 3950c7865cd7c963982a2c94457182b96732f4c9 c57cb36f76eb7ced45f57af1a890d8f3a6d76342 git Not specified
CNA Linux Linux affected 3.7 Not specified
CNA Linux Linux unaffected 3.7 semver Not specified
CNA Linux Linux unaffected 6.12.109 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/c57cb36f76eb7ced45f57af1a890d8f3a6d76342 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/86e4fa65368f3bbb506dddba8c9eedc75bd603b2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6d532582ff3c420598f02945b13184c738cc1581 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/af3ce383ba0d0d48957a22ac7058ff5698775898 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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