usb: gadget: f_midi: initialize work in f_midi_alloc() (CVE-2026-90021) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-90021

usb: gadget: f_midi: initialize work in f_midi_alloc()

Answer in brief

CVE-2026-90021 records a Unknown severity vulnerability in usb: gadget: f_midi: initialize work in f_midi_alloc(). 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 16, 2026Updated Sep 16, 2026Source checked Sep 16, 2026First seen by HOL Sep 16, 2026Material review Sep 16, 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	>=8653d71ce3763aedcf3d2331f59beda3fecd79e4 <3d8b11255e632170f32f1925bfcaf96331f36317 \|\| >=8653d71ce3763aedcf3d2331f59beda3fecd79e4 <02ac76f27db23ef652358458c272d9d2d6f51167 \|\| >=8653d71ce3763aedcf3d2331f59beda3fecd79e4 <858576de6b2f5166b08dae803f0fd0766dcb3002 \|\| >=8653d71ce3763aedcf3d2331f59beda3fecd79e4 <7e07d3e4c389217d7d7171d80edf2e23ac70f1ea \|\| 89019ab7a64fcdf98a2ba7799e5c6aff58d4a05d \|\| 3635523e9b96213969693c320302d536774d8e9b \|\| >=5.4.291 <5.5 \|\| >=5.10.235 <5.11	3d8b11255e632170f32f1925bfcaf96331f36317, 02ac76f27db23ef652358458c272d9d2d6f51167, 858576de6b2f5166b08dae803f0fd0766dcb3002, 7e07d3e4c389217d7d7171d80edf2e23ac70f1ea, 5.5, 5.11
Linux/Linuxgeneric	5.12	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 3d8b11255e632170f32f1925bfcaf96331f36317 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 16, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_midi: initialize work in f_midi_alloc() f_midi_alloc initializes free_ref to 1 and it can only be incremented when a sound card is registered via f_midi_register_card(). f_midi_register_card() is only called in f_midi_bind() which actually performs INIT_WORK. If f_midi_bind() is never run, work is not initialized and the if condition in f_midi_free becomes true, this results in a warning later in __flush_work as work->func = 0. Fix this by moving INIT_WORK from f_midi_bind() to f_midi_alloc().

Quoted source text, attributed separately from HOL analysis.