The ims_pcu_get_cdc_union_desc function in drivers/input/misc/ims-pcu.c in the Linux kernel through 4.13.11 allows local users to cause a denial of service (ims_pcu_parse_cdc_data out-of-bounds read and system crash) or possibly have unspecified other impact via a crafted USB device.
https://usn.ubuntu.com/3754-1/
https://usn.ubuntu.com/3619-2/
https://usn.ubuntu.com/3619-1/
https://usn.ubuntu.com/3617-3/
https://usn.ubuntu.com/3617-2/
https://usn.ubuntu.com/3617-1/
https://groups.google.com/d/msg/syzkaller/q6jjr1OhqO8/WcA99AVFBAAJ
https://github.com/torvalds/linux/commit/ea04efee7635c9120d015dcdeeeb6988130cb67a