This script is Copyright (C) 2016-2017 Tenable Network Security, Inc.
The remote FreeBSD host is missing a security-related update.
The Xen Project reports :
The PV pagetable code has fast-paths for making updates to
pre-existing pagetable entries, to skip expensive re-validation in
safe cases (e.g. clearing only Access/Dirty bits). The bits considered
safe were too broad, and not actually safe.
A malicious PV guest administrator can escalate their privilege to
that of the host.
See also :
Update the affected package.
Risk factor :
High / CVSS Base Score : 7.2