Xen was updated to 4.4.2 to fix multiple vulnerabilities and non-security bugs.

The following vulnerabilities were fixed:

* CVE-2015-4103: Potential unintended writes to host MSI message data field via qemu (XSA-128) (boo#931625)
* CVE-2015-4104: PCI MSI mask bits inadvertently exposed to guests (XSA-129) (boo#931626)
* CVE-2015-4105: Guest triggerable qemu MSI-X pass-through error messages (XSA-130) (boo#931627)
* CVE-2015-4106: Unmediated PCI register access in qemu (XSA-131) (boo#931628)
* CVE-2015-4164: DoS through iret hypercall handler (XSA-136) (boo#932996)
* CVE-2015-4163: GNTTABOP_swap_grant_ref operation misbehavior (XSA-134) (boo#932790)
* CVE-2015-3209: heap overflow in qemu pcnet controller allowing guest to host escape (XSA-135) (boo#932770)
* CVE-2015-3456: Fixed a buffer overflow in the floppy drive emulation, which could be used to denial of service attacks or potential code execution against the host. ()
* CVE-2015-3340: Xen did not initialize certain fields, which allowed certain remote service domains to obtain sensitive information from memory via a (1) XEN_DOMCTL_gettscinfo or (2) XEN_SYSCTL_getdomaininfolist request. ()
* CVE-2015-2752: Long latency MMIO mapping operations are not preemptible (XSA-125 boo#922705)
* CVE-2015-2756: Unmediated PCI command register access in qemu (XSA-126 boo#922706)
* CVE-2015-2751: Certain domctl operations may be abused to lock up the host (XSA-127 boo#922709)
* CVE-2015-2151: Hypervisor memory corruption due to x86 emulator flaw (boo#919464 XSA-123)
* CVE-2015-2045: Information leak through version information hypercall (boo#918998 XSA-122)
* CVE-2015-2044: Information leak via internal x86 system device emulation (boo#918995 (XSA-121)
* CVE-2015-2152: HVM qemu unexpectedly enabling emulated VGA graphics backends (boo#919663 XSA-119)
* CVE-2014-3615: information leakage when guest sets high resolution (boo#895528)

The following non-security bugs were fixed:

* xentop: Fix memory leak on read failure
* boo#923758: xen dmesg contains bogus output in early boot
* boo#921842: Xentop doesn't display disk statistics for VMs using qdisks
* boo#919098: L3: XEN blktap device intermittently fails to connect
* boo#882089: Windows 2012 R2 fails to boot up with greater than 60 vcpus
* boo#903680: Problems with detecting free loop devices on Xen guest startup
* boo#861318: xentop reports "Found interface vif101.0 but domain 101 does not exist."
* boo#901488: Intel ixgbe driver assigns rx/tx queues per core resulting in irq problems on servers with a large amount of CPU cores
* boo#910254: SLES11 SP3 Xen VT-d igb NIC doesn't work
* boo#912011: high ping latency after upgrade to latest SLES11SP3 on xen Dom0
* boo#906689: let systemd schedule xencommons after network-online.target and remote-fs.target so that xendomains has access to remote shares

The following functionality was enabled or enhanced:

* Enable spice support in qemu for x86_64
* Add Qxl vga support
* Enhancement to virsh/libvirtd "send-key" command (FATE#317240)
* Add domain_migrate_constraints_set API to Xend's http interface (FATE#317239)