sound/core/seq_device.c in the Linux kernel before 4.13.4 allows local users to cause a denial of service (snd_rawmidi_dev_seq_free use-after-free and system crash) or possibly have unspecified other impact via a crafted USB device.
Exploitability
AV:PAC:LPR:LUI:NScope
S:UImpact
C:HI:HA:H6.6/CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H