CVE-2026-89465
HighCVSS 8.4Exploitation Probability (EPSS)
Low risk4th percentile - higher than 4% of all known CVEs
Summary
In the Linux kernel, the rt9455 power supply driver contains a use-after-free bug. During driver removal (rt9455_remove), delayed works are cancelled in the wrong order — batt_presence_work can queue max_charging_time_work after it has been cancelled, causing a dereference of the freed rt9455_info structure. The issue also occurs in the probe error path when rt9455_hw_init() fails after the IRQ has been requested.
Risk Assessment
This can lead to kernel memory corruption, system crash (panic), or potential privilege escalation by a local attacker. The risk affects systems with the rt9455 charger where driver removal or initialization failure can be triggered.
Recommendation
Update the Linux kernel to a version containing the fix that registers rt9455_cancel_all_delayed_works() via devm_add_action_or_reset() and cancels works in the correct order. Until patched, restrict the ability of unprivileged users to load/unload the rt9455 driver module.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: power: supply: rt9455: quiesce delayed work before teardown The threaded IRQ handler can queue pwr_rdy_work, max_charging_time_work and batt_presence_work. pwr_rdy_work and batt_presence_work can also queue max_charging_time_work, while batt_presence_work can requeue itself. rt9455_remove() cancels max_charging_time_work before batt_presence_work. The latter can therefore queue max_charging_time_work after it has already been cancelled: rt9455_remove() workqueue cancel pwr_rdy_work cancel max_charging_time_work batt_presence_work queues max_charging_time_work cancel batt_presence_work return devres frees rt9455_info max_charging_time_work dereferences rt9455_info The IRQ also remains registered until devres cleanup and can queue more work after any of the cancellation calls. If rt9455_hw_init() fails after the IRQ has been requested, probe returns without cancelling work that may already have been queued. A pending callback can then access rt9455_info after it has been freed. Register rt9455_cancel_all_delayed_works() through devm_add_action_or_reset() right after devm_power_supply_register(). devres invokes the action in reverse registration order, after the managed IRQ has been freed and before rt9455_info is released, so the delayed works are drained in both rt9455_remove() and the probe error path. Cancel pwr_rdy_work and batt_presence_work before max_charging_time_work because both can queue the latter. This issue was found by an in-house static analysis tool.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS