CVE-2026-89463

What the bug is

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.

Where it lives

The fix touches these files. If the subsystem is one you do not use, the practical exposure is lower, though the package is still the vulnerable one.

drivers/power/supply/ucs1002_power.c

What this is

POWER SUPPLY CLASS/SUBSYSTEM and DRIVERSMAINTAINERS section matched on drivers/power/supply/ · linux-pm@vger.kernel.org · Maintained

Kernel module

none to look for. The file would have gone into ucs1002_power, and Debian does not compile it into that module, so finding ucs1002_power in lsmod would say nothing about this CVE.

Check it on the machine

grep -wE 'CONFIG_CHARGER_UCS1002|CONFIG_POWER_SUPPLY' /boot/config-$(uname -r)

Reads the booted kernel's own configuration, on the machine and nowhere else. =y is built in, =m is a module, and an is not set line means the code is not there.

Show whether Debian builds this, per release

Debian does not build this code. In 5 releases below, every kernel flavour Debian publishes has the switch off, so the vulnerable file is compiled into no kernel binary Debian ships.

• bookworm, trixie, forky, sid, bookworm · linux-6.12n

n

not enabled on any flavour - this release does not build the code

Build switches

CONFIG_CHARGER_UCS1002, CONFIG_POWER_SUPPLY

Reads as

all on means the file is compiled; any one off means it is not.

From the configuration Debian publishes for every kernel flavour it builds. It covers only the architectures Debian ships a linux-config package for, and nothing about a kernel you built yourself. Debian's own status above stays authoritative about the source package.MAINTAINERS kbuild Makefiles Debian linux-config packages

Signals

Published

2026-09-11 (37 days ago)source

CVSS

no vector published, unrated

Attack vector

not published

EPSS

0.21%, higher than 10.7% of all CVEssource

CISA KEV

not listedthe KEV catalogue

Debian urgency

not yet assignedsource

Subsystem

drivers/power

Upstream fixes

The versions the CNA records as introducing and fixing this, and the commit for each. source

Introduced	Fixed in	Commit
5.10	5.15.221	00c19f8a9a58
5.10	6.1.188	a9a7bb801c44
5.10	6.6.157	2ec4d203ecb0
5.10	6.12.109	4ca2a4678202
5.10	6.18.50	39b60d615dfa
5.10	7.2.4	35242c93d35f
5.10	7.3	609af0ceeaef

Debian advisories