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 :
Both writes to the FS and GS register base MSRs as well as the
WRFSBASE and WRGSBASE instructions require their input values to be
canonical, or a #GP fault will be raised. When the use of those
instructions by the hypervisor was enabled, the previous guard against
#GP faults (having recovery code attached) was accidentally removed.
A malicious guest administrator can crash the host, leading to a DoS.
See also :
Update the affected package.
Risk factor :
Medium / CVSS Base Score : 4.9