CVE-2026-89474
Low risk· EPSS 6%Exploitation Probability (EPSS)
Low risk6th percentile - higher than 6% of all known CVEs
Summary
In the Linux kernel, in the power: supply: bq256xx driver the USB-PHY notifier queues usb_work, whose handler calls power_supply_changed(bq->charger). The reset devm action is registered before the power supplies, so devm frees bq->charger before the action runs, and a still-queued usb_work can dereference it. The fix registers the reset action after the supplies and initializes usb_work before the notifiers.
Risk Assessment
A use-after-free in kernel context may occur, leading to a system crash or potential privilege escalation during device detach.
Recommendation
Update the Linux kernel to a version containing the fix. Until patched, avoid hot-unplugging affected bq256xx devices.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS