VirtualBox 4.3.22

virtualbox

VirtualBox is a powerful x86 and AMD64/Intel64 virtualization product for enterprise as well as home use. Targeted at server, desktop and embedded use, it is now the only professional-quality virtualization solution that is also Open Source Software.

Some of the features of VirtualBox are:

Modularity. VirtualBox has an extremely modular design with well-defined internal programming interfaces and a client/server design. This makes it easy to control it from several interfaces at once: for example, you can start a virtual machine in a typical virtual machine GUI and then control that machine from the command line, or possibly remotely. VirtualBox also comes with a full Software Development Kit: even though it is Open Source Software, you don't have to hack the source to write a new interface for VirtualBox.
Virtual machine descriptions in XML. The configuration settings of virtual machines are stored entirely in XML and are independent of the local machines. Virtual machine definitions can therefore easily be ported to other computers.

VirtualBox 4.3.22 is a maintenance release. The following items were fixed and/or added:

VMM: refined measurement of TSC frequency on the host, improves timekeeping for guests
VMM: decreased CPU load resulting from guest MMIO writes to the virtual APIC
VMM: fixed interception of debug exceptions, observed while using the dbx debugger on Solaris guests (VT-x only)
GUI: 3D overlay window positioning code improved, fixed potential misplacement of 3D accelerated guest graphics content
GUI: fixed accident SSL authentication failures during update check on Windows hosts (bug #12969)
GUI: never send the "ACPI power" keyboard scancode to the guest, we have the ACPI power button for that
GUI: was unable to properly restore seamless mode VM from snapshot/saved-state under some circumstances
VBoxHeadless: don't crash if 3D is enabled in the VM settings (bug #10250)
ATA: fixed several passthrough issues (bugs #12310, #1360)
Audio: fixed DirectSound failure when the the host has no audio input device (Windows hosts only; bug #9205)
SB16: fixed compatibility issue (bug #13769)
Storage: fixed broken CD/DVD passthrough when using the IDE controller (bug #12310)
NAT: new ping proxy for Windows hosts (bug #11871)
NAT: Properly report outbound connect(2) failures to guest with TCP RST or ICMP (bug #10525)
NAT Network: no need for frequent wakeups in VBoxNetDHCP and VBoxNetNAT (bug #11681)
Host-only adapter: prevent Windows from creating an "Unidentified network" (bug #9688)
Bridged Networking: don't leak host-to-guest traffic to the wireless network when bridging to a wireless interface (bug #13714)
Main: fixed a possible race when changing the medium leading to a deadlock under rare conditions (bug #13722)
VBoxManage: fixed return code if starting a VM failed (bug #13773)
API: fixed 2 deadlock opportunities related to medium handling (bugs #13789, #13801, thank you Alexander Urakov)
API: fixed bug in XPCOM which created too few worker threads, sporadically resulting in a deadlock (bug #13802, thank you Alexander Urakov)
SDK: fixed a garbage collection leak in the Python VirtualBox webservice API binding (bug #13817)
Linux hosts: fixes for activated SMAP (Broadwell and later, bug #13820)
X11 guests: prevent unwanted hiding of guest screens on multi-monitor guests (bug #13287)
X11 guests: added support for X.Org Server 1.17
X11 Additions: fixed a memory leak in VBoxService if libdbus is available but dbus-daemon isn't running (bug #13770)
Windows Additions: prevent VBox WDDM driver from loading if host reports weak OpenGL capabilities. 3D content now can be shown over Remote Desktop connection.
Winodws Additions: some fixes for recent Windows 10 Previews
Linux Additions: fixed a compatibility issue with 64-bit Linux 2.4 kernels
Linux Additions: fixed a potential use-after-free when unloading the VBoxGuest module
Linux Additions: Linux 3.19 fixes (bug #13741)