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A buffer overflow flaw was found in the way qemu processed MAC addresses table update requests from the guest. A privileged guest user could use this flaw to corrupt qemu process memory on the host, which could potentially result in arbitrary code execution on the host with the privileges of the qemu process. Acknowledgements: This issue was discovered by Michael S. Tsirkin of Red Hat.
Statement: This issue does not affect the kvm and xen packages as shipped with Red Hat Enterprise Linux 5. This issue does affect the qemu-kvm package as shipped with Red Hat Enterprise Linux 6. Future qemu-kvm updates in Red Hat Enterprise Linux 6 may address this flaw.
Upstream patch submission: http://article.gmane.org/gmane.comp.emulators.qemu/266713
Created xen tracking bugs for this issue: Affects: fedora-all [bug 1086776]
Created qemu tracking bugs for this issue: Affects: fedora-all [bug 1086775]
This issue has been addressed in following products: RHEV-H and Agents for RHEL-6 Via RHSA-2014:0421 https://rhn.redhat.com/errata/RHSA-2014-0421.html
This issue has been addressed in following products: Red Hat Enterprise Linux 6 Via RHSA-2014:0420 https://rhn.redhat.com/errata/RHSA-2014-0420.html
This issue has been addressed in following products: OpenStack 3 for RHEL 6 Via RHSA-2014:0435 https://rhn.redhat.com/errata/RHSA-2014-0435.html
This issue has been addressed in following products: OpenStack 4 for RHEL 6 Via RHSA-2014:0434 https://rhn.redhat.com/errata/RHSA-2014-0434.html
qemu-1.6.2-4.fc20 has been pushed to the Fedora 20 stable repository. If problems still persist, please make note of it in this bug report.
This issue has been addressed in following products: RHEV-H and Agents for RHEL-6 Via RHSA-2014:0674 https://rhn.redhat.com/errata/RHSA-2014-0674.html
xen-4.2.5-5.fc19 has been pushed to the Fedora 19 stable repository. If problems still persist, please make note of it in this bug report.
xen-4.3.3-5.fc20 has been pushed to the Fedora 20 stable repository. If problems still persist, please make note of it in this bug report.
xen-4.4.1-9.fc21 has been pushed to the Fedora 21 stable repository. If problems still persist, please make note of it in this bug report.