CVE-2026-89623

/// Technical 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.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References