The saa7164_bus_get function in drivers/media/pci/saa7164/saa7164-bus.c in the Linux kernel through 4.11.5 allows local users to cause a denial of service (out-of-bounds array access) or possibly have unspecified other impact by changing a certain sequence-number value, aka a "double fetch" vulnerability.
https://usn.ubuntu.com/3754-1/
https://lists.debian.org/debian-lts-announce/2017/12/msg00004.html
https://github.com/stoth68000/media-tree/commit/354dd3924a2e43806774953de536257548b5002c
https://bugzilla.kernel.org/show_bug.cgi?id=195559