CVE-2026-90021 PUBLISHED

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

Assigner: Linux
Reserved: 11.09.2026 Published: 16.09.2026 Updated: 16.09.2026

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().

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from 8653d71ce3763aedcf3d2331f59beda3fecd79e4 to 3d8b11255e632170f32f1925bfcaf96331f36317 (excl.)
  • affected from 8653d71ce3763aedcf3d2331f59beda3fecd79e4 to 02ac76f27db23ef652358458c272d9d2d6f51167 (excl.)
  • affected from 8653d71ce3763aedcf3d2331f59beda3fecd79e4 to 858576de6b2f5166b08dae803f0fd0766dcb3002 (excl.)
  • affected from 8653d71ce3763aedcf3d2331f59beda3fecd79e4 to 7e07d3e4c389217d7d7171d80edf2e23ac70f1ea (excl.)
  • Version 89019ab7a64fcdf98a2ba7799e5c6aff58d4a05d is affected
  • Version 3635523e9b96213969693c320302d536774d8e9b is affected
  • affected from 5.4.291 to 5.5 (excl.)
  • affected from 5.10.235 to 5.11 (excl.)
Vendor Linux
Product Linux
Versions Default: affected
  • Version 5.12 is affected
  • unaffected from 0 to 5.12 (excl.)
  • unaffected from 6.12.110 to 6.12.* (incl.)
  • unaffected from 6.18.51 to 6.18.* (incl.)
  • unaffected from 7.2.5 to 7.2.* (incl.)
  • unaffected from 7.3-rc2 to * (incl.)

References