CVE-2026-89474 power: supply: bq256xx: drain usb_work before freeing the charger
A use-after-free in the bq256xx charger driver allows local attackers to cause a system crash or potentially execute code via race conditions.
- 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-2026-89474?
CVE-2026-89474 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: bq256xx: drain usb_work before freeing the charger
The USB-PHY notifier queues usb_work, whose handler calls power_supply_changed(bq->charger). The reset devm action only unregisters the notifier and was registered before the power supplies, so devm frees bq->charger on unwind before the action runs; a usb_work still queued can then dereference it.
Register the reset action after the power supplies, so it unregisters the notifiers and drains usb_work before the supplies are released. Initialize usb_work and obtain the PHY references before registering the notifiers, so the worker cannot run before the supplies exist.
Found by static analysis.
Which versions are affected by CVE-2026-89474?
How do I fix CVE-2026-89474?
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-2026-89474 being exploited?
There is no known exploitation of CVE-2026-89474 in the wild and no public exploit code.
Sources
Also known as AZL-100706, BELL-CVE-2026-89474, DEBIAN-CVE-2026-89474, GHSA-542v-8xr4-x59m, UBUNTU-CVE-2026-89474.