CVE-2026-64584

Technical Description

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

usb: gadget: f_midi: cancel pending IN work before freeing the midi object

The f_midi driver embeds a work item (midi->work) whose handler,

f_midi_in_work(), dereferences the enclosing struct f_midi through

container_of(). This work is armed from two sites: f_midi_complete(),

on a normal IN-endpoint completion, and f_midi_in_trigger(), on an ALSA

rawmidi output-stream start.

Neither f_midi_disable() nor f_midi_unbind() cancels midi->work.

f_midi_disable() only disables the endpoints and drains the in_req_fifo;

it does not synchronize the work item, and the sound card is released

asynchronously to the final free of the midi object.

The midi object is reference-counted (midi->free_ref) and is freed in

f_midi_free() only once both the usb_function reference and the rawmidi

private_data reference have been dropped. In f_midi_unbind(),

f_midi_disable() runs before the sound card is released, so while the

USB endpoints

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