xen : various security flaws (#1397383)
    x86 null segments not always treated as unusable [XSA-191, CVE-2016-9386]
    x86 task switch to VM86 mode mis-handled [XSA-192, CVE-2016-9382]
    x86 segment base write emulation lacking canonical address checks [XSA-193,
    	CVE-2016-9385]
    guest 32-bit ELF symbol table load leaking host data [XSA-194, CVE-2016-9384]
    x86 64-bit bit test instruction emulation broken [XSA-195, CVE-2016-9383]
    x86 software interrupt injection mis-handled [XSA-196, CVE-2016-9377,
    	CVE-2016-9378]
    qemu incautious about shared ring processing [XSA-197, CVE-2016-9381]
    delimiter injection vulnerabilities in pygrub [XSA-198, CVE-2016-9379,
    	CVE-2016-9380]