CVE-2026-89735

/// Technical description

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

usb: gadget: midi2: remove default configfs groups on teardown

f_midi2_alloc_inst() creates default configfs child groups for the

default endpoint and default block using configfs_add_default_group(),

setting their internal refcount to 1.

However, during function teardown in f_midi2_free_inst() or EP cleanup

in f_midi2_ep_opts_release(), configfs_remove_default_groups() is

never called, therefore never dropping the refcount and leaking struct

f_midi2_ep_opts and f_midi2_block_opts.

Add the missing configfs_remove_default_groups() in the afformentioned

functions to free the structs properly.

/// 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