CVE-2026-89464 power: supply: twl4030_charger: cancel workers via devm
A use-after-free vulnerability in the Linux kernel twl4030 charger driver allows local attackers to cause a denial of service or potentially execute code.
- 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-2026-89464?
CVE-2026-89464 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: twl4030_charger: cancel workers via devm
bci is devm-allocated. Two workers (bci->work and bci->current_worker) dereference it. twl4030_bci_remove() disables charging and masks interrupts. It cancels neither worker. A worker pending at remove() can run after devm frees bci.
The USB transceiver comes from devm_usb_get_phy_by_node(). devm unregisters its notifier only after remove() returns. A cancel_work_sync() in remove() can then race a notifier reschedule. devm_work_autocancel() and devm_delayed_work_autocancel() avoid that. They cancel the workers during devm release, before bci is freed.
The current_worker is registered first, since devm will cancel in reverse order and bci->work can reschedule current_worker.
[Move comment about order into the commit message]
Which versions are affected by CVE-2026-89464?
How do I fix CVE-2026-89464?
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-2026-89464 being exploited?
There is no known exploitation of CVE-2026-89464 in the wild and no public exploit code.
Sources
Also known as AZL-100617, BELL-CVE-2026-89464, DEBIAN-CVE-2026-89464, GHSA-pf33-mh27-rp5j, UBUNTU-CVE-2026-89464.