CVE-2026-89797 power: supply: ab8500_fg: fix use-after-free on remove
A use-after-free in the ab8500 fuel gauge driver allows local attackers to cause a denial of service or potentially 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-2026-89797?
CVE-2026-89797 is an use after free vulnerability in Linux, published on 16 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: 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.
Which versions are affected by CVE-2026-89797?
How do I fix CVE-2026-89797?
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-2026-89797 being exploited?
There is no known exploitation of CVE-2026-89797 in the wild and no public exploit code.
Sources
Also known as AZL-101252, BELL-CVE-2026-89797, DEBIAN-CVE-2026-89797, GHSA-vg3c-mvmw-87jj, UBUNTU-CVE-2026-89797.