# CVE-2026-89623

## Summary

- **CVE ID:** CVE-2026-89623
- **Severity:** UNKNOWN
- **CVSS Score:** 0
- **CWE:** N/A
- **Published:** Sep 11, 2026
- **Last Modified:** Sep 16, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:

HID: mcp2221: stop device IO before hid_hw_stop

Quiesce device IO at the start of the devm cleanup callback
mcp2221_hid_unregister() so that incoming HID reports cannot race with
hardware teardown during probe failure or device removal, addressing a
potential use-after-free.

Guard the call to hid_device_io_stop() with io_started. On normal
removal hid_device_remove() has already cleared io_started before the
devres group is released, so an unconditional call would otherwise hit
the !io_started path and emit a spurious "io already stopped" warning
on every removal. The guard preserves the probe-failure balancing,
where io_started is still set after hid_device_io_start(), while
staying silent on the normal removal path.

## Affected Products

- Linux — Linux (d4b50ac06ea6e47bdd2b04e97d1090c673c80645)
- Linux — Linux (6.6.8)

## References

- [CNA](https://git.kernel.org/stable/c/0ae90a19e6b5a8557d25d95facb7e01c9c07af38)
- [CNA](https://git.kernel.org/stable/c/c99ba6c234d4d537c317336376b78c088174034a)
- [CNA](https://git.kernel.org/stable/c/2eda1513f573945c1e3a0090341f3d28740463b1)
- [CNA](https://git.kernel.org/stable/c/dca151633c0fde90935311c60e7cfc064aa56134)
- [CNA](https://git.kernel.org/stable/c/85d963499f1feeea287c0a37c3eac3fc1898eca9)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.21%
- **EPSS Percentile:** 11.2

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._