CVE-2026-89474

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux32e4978bb920d047fe5de3ea42d176f267c01f63 < 9dcfdf6c598301b278f0b3490eb2bf4f600524e2affected
LinuxLinux32e4978bb920d047fe5de3ea42d176f267c01f63 < fd08d4dbbec07a44f01b0ddb041912be0dc88f8caffected
LinuxLinux32e4978bb920d047fe5de3ea42d176f267c01f63 < 2cfb59dc9df8b5ebdd95e3d874a7f4690cee2bc8affected
LinuxLinux32e4978bb920d047fe5de3ea42d176f267c01f63 < 9a467bd1e6811011026ad4c8de701b940d88a00caffected
LinuxLinux32e4978bb920d047fe5de3ea42d176f267c01f63 < 9e1aba34df9a87d53460888e05718717c0f69343affected
LinuxLinux32e4978bb920d047fe5de3ea42d176f267c01f63 < c8addb842ae8dcf69c15fc976e33e3bd538a41d7affected
LinuxLinux32e4978bb920d047fe5de3ea42d176f267c01f63 < 2dd6cd823777bea6d9a880a12a92a73ec76aee0baffected
LinuxLinux5.12affected
LinuxLinux0 < 5.12unaffected
LinuxLinux5.15.221 <= 5.15.*unaffected
LinuxLinux6.1.188 <= 6.1.*unaffected
LinuxLinux6.6.157 <= 6.6.*unaffected
LinuxLinux6.12.109 <= 6.12.*unaffected
LinuxLinux6.18.50 <= 6.18.*unaffected
LinuxLinux7.2.4 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References