Synopsis

Important: kvm security update

Type/Severity

Security Advisory: Important

Topic

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

Red Hat Product Security has rated this update as having Important security
impact. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available from the CVE link in the
References section.

Description

KVM (Kernel-based Virtual Machine) is a full virtualization solution for
Linux on AMD64 and Intel 64 systems.

A flaw was found in the way QEMU's AMD PCnet Ethernet emulation handled
multi-TMD packets with a length above 4096 bytes. A privileged guest user
in a guest with an AMD PCNet ethernet card enabled could potentially use
this flaw to execute arbitrary code on the host with the privileges of the
hosting QEMU process. (CVE-2015-3209)

Red Hat would like to thank Matt Tait of Google's Project Zero security
team for reporting this issue.

All kvm users are advised to upgrade to these updated packages, which
contain a backported patch to correct this issue. 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 - 1225882 - CVE-2015-3209 qemu: pcnet: multi-tmd buffer overflow in the tx path

CVEs

• CVE-2015-3209

References

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

Red Hat Enterprise Linux Server 5

SRPM
kvm-83-273.el5_11.src.rpm	SHA-256: 0526e97934c39fced6075b37d9828f85b0387cb329b40a65fee540544fd0ea8d
x86_64
kmod-kvm-83-273.el5_11.x86_64.rpm	SHA-256: 40b01c448b84068851f909086e217bbb3ccd30b420fa89a53348eaf7f05bfcf2
kmod-kvm-debug-83-273.el5_11.x86_64.rpm	SHA-256: 8f5f11493fce738cabf4ae645e2bbf8f40b71bdf5d6262c3e66ff4fa2075c81f
kvm-83-273.el5_11.x86_64.rpm	SHA-256: 9a76a58eaa44daca95ac2149f2de8476cfedd0fdc1300a6174835c5e8554f541
kvm-debuginfo-83-273.el5_11.x86_64.rpm	SHA-256: 1ff29b712595ccb95337e3d126c9d2fe2a168248f731ec8e7caaec938352bb1c
kvm-qemu-img-83-273.el5_11.x86_64.rpm	SHA-256: 05dadbc8c6cedf606773c4b2ab50eaa08905dab7ee8b5125b5f0b44464db8be6
kvm-tools-83-273.el5_11.x86_64.rpm	SHA-256: 593aaa7fcec22dc02b42cf384bed5d606ed47c9d4427d4344855c9da6dacd298

Red Hat Enterprise Linux Workstation 5

SRPM
kvm-83-273.el5_11.src.rpm	SHA-256: 0526e97934c39fced6075b37d9828f85b0387cb329b40a65fee540544fd0ea8d
x86_64
kmod-kvm-83-273.el5_11.x86_64.rpm	SHA-256: 40b01c448b84068851f909086e217bbb3ccd30b420fa89a53348eaf7f05bfcf2
kmod-kvm-debug-83-273.el5_11.x86_64.rpm	SHA-256: 8f5f11493fce738cabf4ae645e2bbf8f40b71bdf5d6262c3e66ff4fa2075c81f
kvm-83-273.el5_11.x86_64.rpm	SHA-256: 9a76a58eaa44daca95ac2149f2de8476cfedd0fdc1300a6174835c5e8554f541
kvm-debuginfo-83-273.el5_11.x86_64.rpm	SHA-256: 1ff29b712595ccb95337e3d126c9d2fe2a168248f731ec8e7caaec938352bb1c
kvm-qemu-img-83-273.el5_11.x86_64.rpm	SHA-256: 05dadbc8c6cedf606773c4b2ab50eaa08905dab7ee8b5125b5f0b44464db8be6
kvm-tools-83-273.el5_11.x86_64.rpm	SHA-256: 593aaa7fcec22dc02b42cf384bed5d606ed47c9d4427d4344855c9da6dacd298