In the Linux kernel before 4.1.4, a buffer overflow occurs when checking userspace params in drivers/media/dvb-frontends/cx24116.c. The maximum size for a DiSEqC command is 6, according to the userspace API. However, the code allows larger values such as 23.
https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.1.4
https://github.com/torvalds/linux/commit/1fa2337a315a2448c5434f41e00d56b01a22283c