Scientific Linux Security Update : qemu-kvm on SL6.x i386/x86_64

High Nessus Plugin ID 77272


The remote Scientific Linux host is missing one or more security updates.


Two integer overflow flaws were found in the QEMU block driver for QCOW version 1 disk images. A user able to alter the QEMU disk image files loaded by a guest could use either of these flaws 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. (CVE-2014-0222, CVE-2014-0223)

This update also fixes the following bugs :

- In certain scenarios, when performing live incremental migration, the disk size could be expanded considerably due to the transfer of unallocated sectors past the end of the base image. With this update, the bdrv_is_allocated() function has been fixed to no longer return 'True' for unallocated sectors, and the disk size no longer changes after performing live incremental migration.

- This update enables ioeventfd in virtio-scsi-pci. This allows QEMU to process I/O requests outside of the vCPU thread, reducing the latency of submitting requests and improving single task throughput.

- Prior to this update, vendor-specific SCSI commands issued from a KVM guest did not reach the target device due to QEMU considering such commands as invalid. This update fixes this bug by properly propagating vendor-specific SCSI commands to the target device.

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.


Update the affected packages.

See Also

Plugin Details

Severity: High

ID: 77272

File Name: sl_20140819_qemu_kvm_on_SL6_x.nasl

Version: $Revision: 1.2 $

Type: local

Agent: unix

Published: 2014/08/20

Modified: 2014/11/06

Dependencies: 12634

Risk Information

Risk Factor: High


Base Score: 7.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

Vulnerability Information

CPE: x-cpe:/o:fermilab:scientific_linux

Required KB Items: Host/local_checks_enabled, Host/cpu, Host/RedHat/release, Host/RedHat/rpm-list

Patch Publication Date: 2014/08/19

Reference Information

CVE: CVE-2014-0222, CVE-2014-0223