CVE-2026-90021
Description
AI Translation Available
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