CVE-2026-89797
UnknownSummary
In the Linux kernel, the ab8500_fg driver's ab8500_fg_remove() destroys the workqueue while threaded interrupt handlers are still armed. A handler firing in that window queues work on the freed workqueue, causing a use-after-free. The fix tears down the workqueue through devm, registering its cleanup after the power supply and before the interrupt requests.
Risk Assessment
A use-after-free may occur in the kernel during ab8500_fg driver removal, leading to instability or potential privilege escalation. The risk affects systems with this power supply driver.
Recommendation
Update the Linux kernel to a version containing the fix for devm-managed workqueue teardown. Avoid dynamic removal of the ab8500_fg driver until patched.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: power: supply: ab8500_fg: fix use-after-free on remove ab8500_fg_remove() destroys the driver workqueue while the threaded interrupt handlers are still armed; they are devm-managed and freed only after ->remove() returns, so a handler that fires in that window queues work on the freed workqueue. Tear the workqueue down through devm instead, registering its cleanup after the power supply and before the interrupt requests. devm then frees the interrupts first, so the handlers can no longer queue work, before disabling the delayed and plain work items and destroying the workqueue. Disabling the items, rather than cancelling them, keeps them disabled so no producer (including the power-supply external_power_changed callback) can requeue them. Found by an in-house static analysis tool.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS