Qemu emulator built with the Virtual Network Device(virtio-net) support is vulnerable to a DoS issue. It could occur while receiving large packets over the tuntap/ macvtap interfaces and when guest's virtio-net driver did not support big/mergeable receive buffers. An attacker on the local network could use this flaw to disable guest's networking by sending a large number of jumbo frames to the guest, exhausting all receive buffers and thus leading to a DoS situation. Upstream fixes: --------------- -> git.qemu.org/?p=qemu.git;a=commit;h=ce317461573bac12b10d67699b4ddf1f97cf066c -> git.qemu.org/?p=qemu.git;a=commit;h=29b9f5efd78ae0f9cc02dd169b6e80d2c404bade -> git.qemu.org/?p=qemu.git;a=commit;h=0cf33fb6b49a19de32859e2cdc6021334f448fb3 Reference: ---------- -> http://www.openwall.com/lists/oss-security/2015/09/18/9
Statement: This issue affects the versions of kvm package as shipped with Red Hat Enterprise Linux 5. This issue affects the versions of the qemu-kvm packages as shipped with Red Hat Enterprise Linux 6 and 7. This issue affects the Red Hat Enterprise Linux 6 based versions of qemu-kvm-rhev packages as shipped with Red Hat Enterprise Virtualization 3. This issue affects the Red Hat Enterprise Linux 7 based versions of the qemu-kvm-rhev packages as shipped with Red Hat Enterprise Virtualization 3.
This has been rated as having Moderate security impact and is not currently planned to be addressed in future updates. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.
Created xen tracking bugs for this issue: Affects: fedora-all [bug 1264392]
Created qemu tracking bugs for this issue: Affects: fedora-all [bug 1264393]
Acknowledgements: This issue was discovered by Jason Wang of Red Hat Inc.
qemu-2.4.0.1-1.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.
xen-4.5.1-13.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.
xen-4.4.3-6.fc21 has been pushed to the Fedora 21 stable repository. If problems still persist, please make note of it in this bug report.
xen-4.5.1-13.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.
qemu-2.3.1-7.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.