The vulnerability of Xen hypervisors allows a attacker to trigger a service failure or gain privileged access to the host.

The vulnerability of Xen hypervisors is related to deficiencies in access control for GNTMAPdevicemap and GNTMAPhostmap provided that GNTMAPhostmap is in the unmapping mode. Exploiting this vulnerability can allow a malicious actor to cause a service failure memory corruption or gain privileged...

DEBIAN-CVE-2017-10921

The grant-table feature in Xen through 4.8.x does not ensure sufficient type counts for a GNTMAPdevicemap and GNTMAPhostmap mapping, which allows guest OS users to cause a denial of service count mismanagement and memory corruption or obtain privileged host OS access, aka XSA-224 bug 2...