{"id":"DEBIAN-CVE-2026-64584","details":"In the Linux kernel, the following vulnerability has been resolved:  usb: gadget: f_midi: cancel pending IN work before freeing the midi object  The f_midi driver embeds a work item (midi-\u003ework) whose handler, f_midi_in_work(), dereferences the enclosing struct f_midi through container_of().  This work is armed from two sites: f_midi_complete(), on a normal IN-endpoint completion, and f_midi_in_trigger(), on an ALSA rawmidi output-stream start.  Neither f_midi_disable() nor f_midi_unbind() cancels midi-\u003ework. f_midi_disable() only disables the endpoints and drains the in_req_fifo; it does not synchronize the work item, and the sound card is released asynchronously to the final free of the midi object.  The midi object is reference-counted (midi-\u003efree_ref) and is freed in f_midi_free() only once both the usb_function reference and the rawmidi private_data reference have been dropped.  In f_midi_unbind(), f_midi_disable() runs before the sound card is released, so while the USB endpoints are already disabled the rawmidi device is still usable by an open substream.  A concurrent userspace write on such a substream can reach f_midi_in_trigger() and queue midi-\u003ework again after f_midi_disable() has returned.  A work item armed this way may still be pending when the last reference drops and f_midi_free() proceeds to kfree(midi), letting f_midi_in_work() dereference the struct after it has been freed, a use-after-free.  For this reason cancelling midi-\u003ework in f_midi_disable() would not be sufficient: the ALSA trigger path can rearm the work after disable() returns.  Cancelling at the refcount-zero free site is the boundary after which neither arming source can survive, because by then both references that keep the midi object alive have been dropped: the USB endpoints are already disabled and the rawmidi device has been released.  Fix this by calling cancel_work_sync(&midi-\u003ework) in the refcount-zero block of f_midi_free(), before the embedded work_struct is freed along with the rest of the structure.  opts-\u003elock is a sleeping mutex, so calling cancel_work_sync() under it is permitted, and the handler takes midi-\u003etransmit_lock rather than opts-\u003elock, so no self-deadlock can occur while it waits for a running instance of the work to finish.  This issue was found by an in-house static analysis tool.","modified":"2026-09-14T17:03:22.653923768Z","published":"2026-08-06T08:16:33.543Z","upstream":["CVE-2026-64584"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-64584"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.187-1"}]}],"versions":["6.1.106-1","6.1.106-2","6.1.106-3","6.1.112-1","6.1.115-1","6.1.119-1","6.1.123-1","6.1.124-1","6.1.128-1","6.1.129-1","6.1.133-1","6.1.135-1","6.1.137-1","6.1.139-1","6.1.140-1","6.1.147-1","6.1.148-1","6.1.153-1","6.1.158-1","6.1.159-1","6.1.162-1","6.1.164-1","6.1.170-1","6.1.170-2","6.1.170-3","6.1.172-1","6.1.174-1","6.1.176-1","6.1.177-1","6.1.180-1","6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1","6.1.64-1","6.1.66-1","6.1.67-1","6.1.69-1","6.1.69-1~bpo11+1","6.1.76-1","6.1.76-1~bpo11+1","6.1.82-1","6.1.85-1","6.1.90-1","6.1.90-1~bpo11+1","6.1.94-1","6.1.94-1~bpo11+1","6.1.98-1","6.1.99-1"],"ecosystem_specific":{"urgency":"not 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