The restore_fpu_checking function in
arch/x86/include/asm/fpu-internal.h in the Linux kernel before 3.12.8
on the AMD K7 and K8 platforms does not clear pending exceptions
before proceeding to an EMMS instruction, which allows local users to
cause a denial of service (task kill) or possibly gain privileges via
a crafted application.
Note:References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MLIST:[linux-kernel] 20140110 Re: Sanitize CPU-state when switching tasks (was sanitize CPU-state when switching from virtual-8086 mode to other task)
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