Important CentOS kvm Security Update


kmod-kvm-83-276.el5.centos.x86_64.rpm, kmod-kvm-debug-83-276.el5.centos.x86_64.rpm, kvm-83-276.el5.centos.src.rpm, kvm-83-276.el5.centos.x86_64.rpm, kvm-qemu-img-83-276.el5.centos.x86_64.rpm, kvm-tools-83-276.el5.centos.x86_64.rpm
CVE-2016-3710, CVE-2016-5403,
2017-07-27 19:11
CVE-2016-5403 qemu-kvm
CVE-2016-5403 xen
CVE-2016-3710 qemu
CVE-2016-3710 qemu-kvm
CVE-2016-3710 xen
CVE-2016-5403 qemu
2017-04-01 19:10
2017-01-05 20:14


An update for kvm is now available for Red Hat Enterprise Linux 5.

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

KVM (for Kernel-based Virtual Machine) is a full virtualization solution for Linux on x86 hardware. Using KVM, one can run multiple virtual machines running unmodified Linux or Windows images. Each virtual machine has private virtualized hardware: a network card, disk, graphics adapter, etc.

Security Fix(es):

* An out-of-bounds read/write access flaw was found in the way QEMU's VGA emulation with VESA BIOS Extensions (VBE) support performed read/write operations using I/O port methods. A privileged guest user could use this flaw to execute arbitrary code on the host with the privileges of the host's QEMU process. (CVE-2016-3710)

* Quick Emulator(QEMU) built with the virtio framework is vulnerable to an unbounded memory allocation issue. It was found that a malicious guest user could submit more requests than the virtqueue size permits. Processing a request allocates a VirtQueueElement results in unbounded memory allocation on the host controlled by the guest. (CVE-2016-5403)

Red Hat would like to thank Wei Xiao (360 Marvel Team) and Qinghao Tang (360 Marvel Team) for reporting CVE-2016-3710 and hongzhenhao (Marvel Team) for reporting CVE-2016-5403.
Please see

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Affected package information

Release Package Patched in
5 kmod-kvm kmod-kvm-83-276.el5.centos.x86_64.rpm
kmod-kvm-debug kmod-kvm-debug-83-276.el5.centos.x86_64.rpm
kvm kvm-83-276.el5.centos.src.rpm
kvm kvm-83-276.el5.centos.x86_64.rpm
kvm-qemu-img kvm-qemu-img-83-276.el5.centos.x86_64.rpm
kvm-tools kvm-tools-83-276.el5.centos.x86_64.rpm