What’s Vulnerable › Vulnerabilities

CVE-2026-89474: power: supply: bq256xx: drain usb_work before freeing the charger

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-11 · updated 2026-10-19

Description

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 products

• Linux kernel: 5.12 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/2cfb59dc9df8b5ebdd95e3d874a7f4690cee2bc8
• https://git.kernel.org/stable/c/2dd6cd823777bea6d9a880a12a92a73ec76aee0b
• https://git.kernel.org/stable/c/9a467bd1e6811011026ad4c8de701b940d88a00c
• https://git.kernel.org/stable/c/9dcfdf6c598301b278f0b3490eb2bf4f600524e2
• https://git.kernel.org/stable/c/9e1aba34df9a87d53460888e05718717c0f69343
• https://git.kernel.org/stable/c/c8addb842ae8dcf69c15fc976e33e3bd538a41d7
• https://git.kernel.org/stable/c/fd08d4dbbec07a44f01b0ddb041912be0dc88f8c

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