SUSE-SU-2017:2319-1 Security update for xen

This update for xen fixes several issues. These security issues were fixed: - CVE-2017-12135: Unbounded recursion in grant table code allowed a malicious guest to crash the host or potentially escalate privileges/leak information XSA-226, bsc1051787. - CVE-2017-12137: Incorrectly-aligned updates ...