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Red Hat Enterprise Linux 6 RHSA-2016:1585-01 Moderate DoS in Qemu-Kvm

red hat
Calendar Grey August 9, 2016
Scroller Redhat
This notification outlines a significant security enhancement for QEMU-KVM in Red Hat Enterprise Linux 6, focusing on vulnerabilities related to memory management.
An update for qemu-kvm is now available for Red Hat Enterprise Linux 6

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

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

After installing this update, shut down all running virtual machines. Once all virtual machines have shut down, start them again for this update to take effect.

Summary

KVM (Kernel-based Virtual Machine) is a full virtualization solution for Linux on AMD64 and Intel 64 systems. The qemu-kvm packages provide the user-space component for running virtual machines using KVM.
Security Fix(es):
* 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 and therefore causes unbounded memory allocation on the host controlled by the guest. (CVE-2016-5403)
Red Hat would like to thank hongzhenhao (Marvel Team) for reporting this issue.

Topics%20covered

Topics Covered

security advisory Red Hat Enterprise Linux moderate impact DoS threat memory allocation qemu-kvm

References

https://access.redhat.com/security/cve/CVE-2016-5403 https://access.redhat.com/security/updates/classification/#moderate

Package List

Red Hat Enterprise Linux Desktop (v. 6):
Source: qemu-kvm-0.12.1.2-2.491.el6_8.3.src.rpm
i386: qemu-guest-agent-0.12.1.2-2.491.el6_8.3.i686.rpm qemu-kvm-debuginfo-0.12.1.2-2.491.el6_8.3.i686.rpm
x86_64: qemu-guest-agent-0.12.1.2-2.491.el6_8.3.x86_64.rpm qemu-img-0.12.1.2-2.491.el6_8.3.x86_64.rpm qemu-kvm-0.12.1.2-2.491.el6_8.3.x86_64.rpm qemu-kvm-debuginfo-0.12.1.2-2.491.el6_8.3.x86_64.rpm qemu-kvm-tools-0.12.1.2-2.491.el6_8.3.x86_64.rpm
Red Hat Enterprise Linux HPC Node (v. 6):
Source: qemu-kvm-0.12.1.2-2.491.el6_8.3.src.rpm
x86_64: qemu-guest-agent-0.12.1.2-2.491.el6_8.3.x86_64.rpm qemu-img-0.12.1.2-2.491.el6_8.3.x86_64.rpm qemu-kvm-0.12.1.2-2.491.el6_8.3.x86_64.rpm qemu-kvm-debuginfo-0.12.1.2-2.491.el6_8.3.x86_64.rpm qemu-kvm-tools-0.12.1.2-2.491.el6_8.3.x86_64.rpm
Red Hat Enterprise Linux Server (v. 6):
Source: qemu-kvm-0.12.1.2-2.491.el6_8.3.src.rpm
i386: qemu-guest-agent-0.12.1.2-2.491.el6_8.3.i686.rpm qemu-kvm-debuginfo-0.12.1.2-2.491.el6_8.3.i686.rpm
ppc64: qemu-guest-agent-0.12.1.2-2.491.el6_8.3.ppc64.rpm qemu-kvm-debuginfo-0.12.1.2-2.491.el6_8.3.ppc64.rpm
x86_64: qemu-guest-agent-0.12.1.2-2.491.el6_8.3.x86_64.rpm qemu-img-0.12.1.2-2.491.el6_8.3.x86_64.rpm qemu-kvm-0.12.1.2-2.491.el6_8.3.x86_64.rpm qemu-kvm-debuginfo-0.12.1.2-2.491.el6_8.3.x86_64.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2016:1585-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2016:1585.html
Issue date: 2016-08-09

Topic

An update for qemu-kvm is now available for Red Hat Enterprise Linux 6.Red Hat Product Security has rated this update as having a security impactof Moderate. A Common Vulnerability Scoring System (CVSS) base score, whichgives a detailed severity rating, is available for each vulnerability fromthe CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory Red Hat Enterprise Linux moderate impact DoS threat memory allocation qemu-kvm

Relevant Releases Architectures

Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64

Red Hat Enterprise Linux HPC Node (v. 6) - x86_64

Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, x86_64

Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64

Bugs Fixed

1358359 - CVE-2016-5403 Qemu: virtio: unbounded memory allocation on host via guest leading to DoS

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