CVE-2026-90021

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().

• https://git.kernel.org/stable/c/02ac76f27db23ef652358458c272d9d2d6f51167
• https://git.kernel.org/stable/c/3d8b11255e632170f32f1925bfcaf96331f36317
• https://git.kernel.org/stable/c/7e07d3e4c389217d7d7171d80edf2e23ac70f1ea
• https://git.kernel.org/stable/c/858576de6b2f5166b08dae803f0fd0766dcb3002