UBUNTU-CVE-2026-89472: Use After Free

In the Linux kernel, the following vulnerability has been resolved: power: supply: charger-manager: register regulators before exposing sysfs chargermanagerremove() and the errregextcon probe error path free each charger regulator with regulatorput() before tearing down the powersupply sysfs entries (powersupplyunregister()). chargermanagerremove() also calls trychargerenable(cm, false) after the regulatorput() loop. A concurrent write to a charger's externallycontrol sysfs attribute that lands between regulatorput() and powersupplyunregister() can run chargerexternallycontrolstore() and call trychargerenable(), which, when charging is enabled, dereferences the already-freed consumer handle. When charging is enabled, trychargerenable(cm, false) in .remove() also dereferences the freed handles directly. Both leave use-after-free windows. Symmetrically, probe registers the sysfs entries (powersupplyregister) before acquiring the regulators (regulatorget, inside chargermanagerregisterextcon), so userspace can reach externallycontrol before the regulators are available. Split chargermanagerregisterextcon() on the sync/async boundary: chargermanagergetregulators() (regulatorget only, no async producer) now runs before powersupplyregister() so sysfs is not live before regulators are available, and chargermanagerregisterextcon() keeps only the extcon notifier/work setup, still after powersupplyregister() so a powersupplyregister() 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 powersupplyunregister() and trychargerenable(cm, false) ahead of the regulatorput() loop on both teardown paths, and adjust errregextcon (powersupplyunregister() then fall through errregulator for regulatorput(); getregulators 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.