Fedora 27 : xen (2018-1a467757ce)

preemption checks bypassed in x86 PV MM handling XSA-264, CVE-2018-12891 x86: DB exception safety check can be triggered by a guest XSA-265, CVE-2018-12893 libxl fails to honour readonly flag on HVM emulated SCSI disks XSA-266, CVE-2018-12892 ---- Speculative register leakage from lazy FPU contex...

CVE-2018-3665 - Citrix XenServer Security Update

Description of Problem An issue has been identified in certain CPUs that may allow code running in a guest VM to read data from another process in the same VM or another VM running on the same host. The data that can be read is limited to specific CPU registers rather than memory or disk storage;...

Speculative register leakage from lazy FPU context switching

ISSUE DESCRIPTION x86 has a hardware mechanism for lazy FPU context switching. On a task switch, %cr0.ts Task Switched gets set, and the next instruction to touch floating point state raises an NM No Math, later known as Device Not Available exception. Traditionally, FPU state has been large in...