CVE-2026-89463 power: supply: ucs1002: fix use-after-free on remove
A use-after-free vulnerability in the Linux kernel UCS1002 power supply driver allows local attackers to cause denial of service or execute code during device removal.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-89463?
CVE-2026-89463 is an use after free vulnerability in Linux, published on 11 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
power: supply: ucs1002: fix use-after-free on remove
ucs1002 has no remove callback, so unbind runs entirely through devm. The alert IRQ handler queues the health_poll delayed work, and the work reschedules itself while the chip reports a bad-health condition. devm frees the alert IRQ, which only synchronizes the handler; it does not cancel the delayed work, which can then run after devm frees the driver data and dereference it.
Register health_poll with devm_delayed_work_autocancel() before the alert IRQ is requested. devm then frees the IRQ before cancelling the work, so the handler can no longer queue it and the work is cancelled before the driver data is freed.
This issue was found by an in-house static analysis tool.
Which versions are affected by CVE-2026-89463?
How do I fix CVE-2026-89463?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-89463 being exploited?
There is no known exploitation of CVE-2026-89463 in the wild and no public exploit code.
Sources
Also known as AZL-100079, BELL-CVE-2026-89463, DEBIAN-CVE-2026-89463, GHSA-p52j-g5j4-c2w7, UBUNTU-CVE-2026-89463.