Xen was updated to fix eight vulnerabilities.

The following vulnerabilities were fixed:

* CVE-2015-2751: Certain domctl operations may be abused to lock up the host (XSA-127 boo#922709)
* 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-2015-4163: 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-2015-4164: DoS through iret hypercall handler (XSA-136) (boo#932996)