The fbld instruction emulation in Xen 3.3.x through 4.3.x does not use
the correct variable for the source effective address, which allows
local HVM guests to obtain hypervisor stack information by reading the
values used by the instruction.
Note:References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MLIST:[oss-security] 20130930 Xen Security Advisory 66 (CVE-2013-4361) - Information leak through fbld instruction emulation
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