CVE-2026-89474

What the bug is

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.

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/bq256xx_charger.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 bq256xx_charger, and Debian does not compile it into that module, so finding bq256xx_charger in lsmod would say nothing about this CVE.

Check it on the machine

grep -wE 'CONFIG_CHARGER_BQ256XX|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_BQ256XX, 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

0.17%, higher than 6.2% 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
5.12	5.15.221	9dcfdf6c5983
5.12	6.1.188	fd08d4dbbec0
5.12	6.6.157	2cfb59dc9df8
5.12	6.12.109	9a467bd1e681
5.12	6.18.50	9e1aba34df9a
5.12	7.2.4	c8addb842ae8
5.12	7.3	2dd6cd823777

Debian advisories