usb: gadget: midi2: remove default configfs groups on teardown (CVE-2026-89735) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-89735

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

Answer in brief

CVE-2026-89735 records a Unknown severity vulnerability in usb: gadget: midi2: remove default configfs groups on teardown. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 11, 2026Updated Sep 11, 2026Source checked Sep 11, 2026First seen by HOL Sep 11, 2026Material review Sep 11, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=8b645922b22303cec4628dbbbf6c8553d1cdec87 <4beda67ee72e0c8df5b49951dd8b96f6adb25e02 \|\| >=8b645922b22303cec4628dbbbf6c8553d1cdec87 <a15c2acd3083461f91725760e59dff88b33c28f6 \|\| >=8b645922b22303cec4628dbbbf6c8553d1cdec87 <9ea5dfb2bfef4f8a7e704d1921d8a790cb7fb700 \|\| >=8b645922b22303cec4628dbbbf6c8553d1cdec87 <0f6bffb5008f0cba9cad5ded2caccc64466a6e54	4beda67ee72e0c8df5b49951dd8b96f6adb25e02, a15c2acd3083461f91725760e59dff88b33c28f6, 9ea5dfb2bfef4f8a7e704d1921d8a790cb7fb700, 0f6bffb5008f0cba9cad5ded2caccc64466a6e54
Linux/Linuxgeneric	6.6	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 4beda67ee72e0c8df5b49951dd8b96f6adb25e02 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 11, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.