Debian LTS DLA-964-1 Moderate: Multiple Xen Hypervisor Issues

Multiple vulnerabilities have been discovered in the Xen hypervisor. The
Common Vulnerabilities and Exposures project identifies the following
problems:

CVE-2016-9932 (XSA-200)

CMPXCHG8B emulation allows local HVM guest OS users to obtain sensitive
information from host stack memory.

CVE-2017-7995

Description
Xen checks access permissions to MMIO ranges only after accessing them,
allowing host PCI device space memory reads.

CVE-2017-8903 (XSA-213)

Xen mishandles page tables after an IRET hypercall which can lead to
arbitrary code execution on the host OS. The vulnerability is only exposed
to 64-bit PV guests.

CVE-2017-8904 (XSA-214)

Xen mishandles the "contains segment descriptors" property during
GNTTABOP_transfer. This might allow PV guest OS users to execute arbitrary
code on the host OS.

CVE-2017-8905 (XSA-215)

Xen mishandles a failsafe callback which might allow PV guest OS users to
execute arbitrary code on the host OS.