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Red Hat Security Advisory
Synopsis: Important: kvm security update
Advisory ID: RHSA-2014:0163-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2014-0163.html
Issue date: 2014-02-12
CVE Names: CVE-2013-6367 CVE-2013-6368
Updated kvm packages that fix two security issues are now available for Red
Hat Enterprise Linux 5.
The Red Hat Security Response Team has rated this update as having
Important security impact. Common Vulnerability Scoring System (CVSS) base
scores, which give detailed severity ratings, are available for each
vulnerability from the CVE links in the References section.
2. Relevant releases/architectures:
RHEL Desktop Multi OS (v. 5 client) – x86_64
RHEL Virtualization (v. 5 server) – x86_64
KVM (Kernel-based Virtual Machine) is a full virtualization solution for
Linux on AMD64 and Intel 64 systems. KVM is a Linux kernel module built for
the standard Red Hat Enterprise Linux kernel.
A divide-by-zero flaw was found in the apic_get_tmcct() function in KVM’s
Local Advanced Programmable Interrupt Controller (LAPIC) implementation.
A privileged guest user could use this flaw to crash the host.
A memory corruption flaw was discovered in the way KVM handled virtual APIC
accesses that crossed a page boundary. A local, unprivileged user could use
this flaw to crash the system or, potentially, escalate their privileges on
the system. (CVE-2013-6368)
Red Hat would like to thank Andrew Honig of Google for reporting these
All kvm users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues. Note: the procedure in
the Solution section must be performed before this update will take effect.
Before applying this update, make sure all previously released errata
relevant to your system have been applied.
This update is available via the Red Hat Network. Details on how to use the
Red Hat Network to apply this update are available at
The following procedure must be performed before this update will take
1) Stop all KVM guest virtual machines.
2) Either reboot the hypervisor machine or, as the root user, remove (using
“modprobe -r [module]”) and reload (using “modprobe [module]”) all of the
following modules which are currently running (determined using “lsmod”):
kvm, ksm, kvm-intel or kvm-amd.
3) Restart the KVM guest virtual machines.
5. Bugs fixed (https://bugzilla.redhat.com/):
1032207 – CVE-2013-6367 kvm: division by zero in apic_get_tmcct()
1032210 – CVE-2013-6368 kvm: cross page vapic_addr access
6. Package List:
RHEL Desktop Multi OS (v. 5 client):
RHEL Virtualization (v. 5 server):
These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
The Red Hat security contact is <firstname.lastname@example.org>. More contact
details at https://access.redhat.com/security/team/contact/
Copyright 2014 Red Hat, Inc.
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