Synopsis

Important: kvm security update

Type/Severity

Security Advisory: Important

Topic

Updated kvm packages that fix two security issues are now available for Red
Hat Enterprise Linux 5.

Red Hat Product Security 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.

Description

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.

It was found that KVM's Write to Model Specific Register (WRMSR)
instruction emulation would write non-canonical values passed in by the
guest to certain MSRs in the host's context. A privileged guest user could
use this flaw to crash the host. (CVE-2014-3610)

A race condition flaw was found in the way the Linux kernel's KVM subsystem
handled PIT (Programmable Interval Timer) emulation. A guest user who has
access to the PIT I/O ports could use this flaw to crash the host.
(CVE-2014-3611)

Red Hat would like to thank Lars Bull of Google and Nadav Amit for
reporting the CVE-2014-3610 issue, and Lars Bull of Google for reporting
the CVE-2014-3611 issue.

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.

Solution

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

The following procedure must be performed before this update will take
effect:

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.

Affected Products

• Red Hat Enterprise Linux Server 5 x86_64
• Red Hat Enterprise Linux Workstation 5 x86_64

Fixes

• BZ - 1144878 - CVE-2014-3611 kernel: kvm: PIT timer race condition
• BZ - 1144883 - CVE-2014-3610 kernel: kvm: noncanonical MSR writes

CVEs

• CVE-2014-3611
• CVE-2014-3610

References

• https://access.redhat.com/security/updates/classification/#important

Red Hat Enterprise Linux Server 5

SRPM
kvm-83-270.el5_11.src.rpm	SHA-256: c629e6854dada09d3511669d18a3e631867ffc0274987530833a46c5286d41de
x86_64
kmod-kvm-83-270.el5_11.x86_64.rpm	SHA-256: 9880466bf433b84828426b5116de8420d217d0902c78b5ce34837d27e4b20404
kmod-kvm-debug-83-270.el5_11.x86_64.rpm	SHA-256: 005690052bb02a193c85b8d1bbe5c39d0f553d90c8c3581749d5dd785a434534
kvm-83-270.el5_11.x86_64.rpm	SHA-256: e1fce80ecb373158a5f3d06c71808fdbf8171f7c5da94a1cf228709216351f4f
kvm-debuginfo-83-270.el5_11.x86_64.rpm	SHA-256: 8a18d860adeec65fd59d534d9df71416561e7c6aa381013fb8f76ba659988d09
kvm-qemu-img-83-270.el5_11.x86_64.rpm	SHA-256: 6282d5d8e822b529df0a9ab0d08a50cb0fd3173c63b93c0d2b6776690406972e
kvm-tools-83-270.el5_11.x86_64.rpm	SHA-256: 5201ad6df83adcd9c9888b4b9f9ccdf0c01392703f00a97f5e755a1e0b6b4b78

Red Hat Enterprise Linux Workstation 5

SRPM
kvm-83-270.el5_11.src.rpm	SHA-256: c629e6854dada09d3511669d18a3e631867ffc0274987530833a46c5286d41de
x86_64
kmod-kvm-83-270.el5_11.x86_64.rpm	SHA-256: 9880466bf433b84828426b5116de8420d217d0902c78b5ce34837d27e4b20404
kmod-kvm-debug-83-270.el5_11.x86_64.rpm	SHA-256: 005690052bb02a193c85b8d1bbe5c39d0f553d90c8c3581749d5dd785a434534
kvm-83-270.el5_11.x86_64.rpm	SHA-256: e1fce80ecb373158a5f3d06c71808fdbf8171f7c5da94a1cf228709216351f4f
kvm-debuginfo-83-270.el5_11.x86_64.rpm	SHA-256: 8a18d860adeec65fd59d534d9df71416561e7c6aa381013fb8f76ba659988d09
kvm-qemu-img-83-270.el5_11.x86_64.rpm	SHA-256: 6282d5d8e822b529df0a9ab0d08a50cb0fd3173c63b93c0d2b6776690406972e
kvm-tools-83-270.el5_11.x86_64.rpm	SHA-256: 5201ad6df83adcd9c9888b4b9f9ccdf0c01392703f00a97f5e755a1e0b6b4b78