SUSE-SU-2015:0745-1

Description of the patch:

The Virtualization service XEN was updated to fix various bugs and security issues.

The following security issues have been fixed:

* 

  CVE-2015-2756: XSA-126: Unmediated PCI command register access in
  qemu could have lead to denial of service attacks against the host,
  if PCI cards are - passed through to guests.

* 

  XSA-125: Long latency MMIO mapping operations were not preemptible.

* 

  CVE-2015-2151: XSA-123: Instructions with register operands ignored
  eventual segment overrides encoded for them. Due to an insufficiently
  conditional assignment such a bogus segment override could have,
  however, corrupted a pointer used subsequently to store the result of
  the instruction.

* 

  CVE-2015-2045: XSA-122: The code handling certain sub-operations of
  the HYPERVISOR_xen_version hypercall failed to fully initialize all
  fields of structures subsequently copied back to guest memory. Due to
  this hypervisor stack contents were copied into the destination of
  the operation, thus becoming visible to the guest.

* 

  CVE-2015-2044: XSA-121: Emulation routines in the hypervisor dealing
  with certain system devices checked whether the access size by the
  guest is a supported one. When the access size is unsupported these
  routines failed to set the data to be returned to the guest for read
  accesses, so that hypervisor stack contents were copied into the
  destination of the operation, thus becoming visible to the guest.

Security Issues:

* CVE-2015-2044
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2044>
* CVE-2015-2045
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2045>
* CVE-2015-2151
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2151>
* CVE-2015-2756
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2756>