FreeBSD : xen-kernel -- x86 segment base write emulation lacking canonical address checks (53dbd096-ba4d-11e6-ae1b-002590263bf5)

This script is Copyright (C) 2016-2017 Tenable Network Security, Inc.

Synopsis :

The remote FreeBSD host is missing a security-related update.

Description :

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 :

Solution :

Update the affected package.

Risk factor :

Medium / CVSS Base Score : 4.9

Family: FreeBSD Local Security Checks

Nessus Plugin ID: 95507 ()

Bugtraq ID:

CVE ID: CVE-2016-9385

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