X11 guests: fix a bug handling video driver display properties which prevented GNOME Shell on Fedora 21 from starting.X11 guests: fixed a wrong parameter in the video driver which caused problems with full-screen X11 clients (bug #2748).X11 guests: Add support for X.Org Server 1.16 (bug #13207).X11 Additions: support X.Org Server 1.15 (bug #12623).Linux Additions: Linux 3.19 fixes ( #13741).Linux Additions: fixed a potential use-after-free when unloading the VBoxGuest module.Linux guests: fix a crash in gnome-session (bug #13335).X11 hosts: fixed a problem of input focus cycles and immediately released key presses in full screen mode (bug #13238).X11 hosts: Made the extra key on Brazilian Thinkpads work (bug #8745).NAT: fixed handling of the RFC 1533 DHCP PAD option.Storage: fixed data corruption when resizing VHD images under certain circumstances.Floppy: fixed read errors and guest memory corruption when running under control of QEMM.VRDP: fixed a rare crash when using remote audio input.VMM: fixed a potential misbehavior after restoring the A20 state from a saved state.Windows hosts: more hardening fixes (e.g.Solaris hosts: fixed using of VNIC templates with Crossbow based bridged networking to be compatible with vanity interface names.Linux hosts / guests: Linux 4.0 fixes (bug #13835).Linux hosts: fixes for activated SMAP (Broadwell and later, bug #13820).Mac OS X hosts: don't panic on hosts with activated SMAP (Broadwell and later bug #13951).BIOS: fixed the returned size value of the VBE 2.0 PMI function 0Ah (4.2.0 regression bug #14096).Storage: fixed hang during power off if the iSCSI over internal network feature is used.VRDP: fixed incompatibility with rdesktop 1.8.3.Linux hosts: fixed a bug which made the netfilter driver ignore certain events (bug #12264).Main: implemented dedicated event processing queue.

ExtPack: don't fail if the TMP directory contains non-latin1 characters (bug #14159).Storage: fixed a crash when taking snapshots (4.2.30 regression).Linux Additions: Linux 4.2 fixes (bug #14227).The following items were fixed and/or added: This page lists all changes of the VirtualBox 4.2 releases.

Virtualbox extension pack 4.2.4