This update for xen fixes several issues. These security issues were fixed: - CVE-2017-5753, CVE-2017-5715, CVE-2017-5754: Prevent information leaks via side effects of speculative execution, aka Spectre and Meltdown attacks - CVE-2017-15595: x86 PV guest OS users were able to cause a DoS or possibly gain privileges via crafted page-table stacking - CVE-2017-17566: Prevent PV guest OS users to cause a denial of service or gain host OS privileges in shadow mode by mapping a certain auxiliary page . - CVE-2017-17563: Prevent guest OS users to cause a denial of service or gain host OS privileges by leveraging an incorrect mask for reference-count overflow checking in shadow mode . - CVE-2017-17564: Prevent guest OS users to cause a denial of service or gain host OS privileges by leveraging incorrect error handling for reference counting in shadow mode . - CVE-2017-17565: Prevent PV guest OS users to cause a denial of service if shadow mode and log-dirty mode are in place, because of an incorrect assertion related to M2P . - CVE-2018-5683: The vga_draw_text function allowed local OS guest privileged users to cause a denial of service by leveraging improper memory address validation . - CVE-2017-18030: The cirrus_invalidate_region function allowed local OS guest privileged users to cause a denial of service via vectors related to negative pitch . These non-security issues were fixed: - bsc#1051729: Prevent invalid symlinks after install of SLES 12 SP2 - bsc#1035442: Increased the value of LIBXL_DESTROY_TIMEOUT from 10 to 100 seconds. If many domUs shutdown in parallel the backends couldn"t keep up - bsc#1027519: Added several upstream patches