This recommended to virtualbox to version 5.2.12 (boo#1094158) resolves the following issues:

- Serial: fixed possible data corruption when sending data under certain circumstances
- Video recording: fixed starting / stopping recording under certain circumstances
- Linux guests: support Linux 4.16 and EL 7.5 kernels
- Linux guests: 3D fixes for recent guests

The following tracked build fix is included:

- boo#1093731: Fix build errors with Qt 5.11