This is a DoS in VirtualBox 5.2.14 running BSD-based guests (tested with NetBSD 7.1.2). The issue was assigned CVE-2018-3005 and anounced in Oracle Critical Patch Update Advisory July 2018.
An unprivileged user can provoke a denial of service of a VirtualBox virtual machine running a BSD-based guest. It was accidentially found while fuzzing the trap handlers of various BSDs.