CVE-2026-90021 is a vulnerability in Linux Kernel
Published on September 16, 2026
usb: gadget: f_midi: initialize work in f_midi_alloc()
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().
Products Associated with CVE-2026-90021
Want to know whenever a new CVE is published for Linux Kernel? stack.watch will email you.
Affected Versions
Linux:- Version 8653d71ce3763aedcf3d2331f59beda3fecd79e4 and below 3d8b11255e632170f32f1925bfcaf96331f36317 is affected.
- Version 8653d71ce3763aedcf3d2331f59beda3fecd79e4 and below 02ac76f27db23ef652358458c272d9d2d6f51167 is affected.
- Version 8653d71ce3763aedcf3d2331f59beda3fecd79e4 and below 858576de6b2f5166b08dae803f0fd0766dcb3002 is affected.
- Version 8653d71ce3763aedcf3d2331f59beda3fecd79e4 and below 7e07d3e4c389217d7d7171d80edf2e23ac70f1ea is affected.
- Version 89019ab7a64fcdf98a2ba7799e5c6aff58d4a05d is affected.
- Version 3635523e9b96213969693c320302d536774d8e9b is affected.
- Version 5.4.291 and below 5.5 is affected.
- Version 5.10.235 and below 5.11 is affected.
- Version 5.12 is affected.
- Before 5.12 is unaffected.
- Version 6.12.110, <= 6.12.* is unaffected.
- Version 6.18.51, <= 6.18.* is unaffected.
- Version 7.2.5, <= 7.2.* is unaffected.
- Version 7.3-rc2, <= * is unaffected.