RHBA-2016:2678 - Bug Fix Advisory

Topic

Updated qemu-kvm packages that fix one bug are now available for Red Hat Enterprise Linux 7.

Description

Kernel-based Virtual Machine (KVM) 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.

This update fixes the following bug:

• After applying the fix for security issue CVE-2016-3712, the installation of certain guests on Red Hat Enterprise Linux was not possible due to unmodifiable registers. This update introduces a new register set to be used instead of vga registers in these guests. As a result, the vga registers no longer cause the guest installation to fail. (BZ#1347527)
• Previously, calling the Streaming SIMD Extensions 4 (SSE4) version of the strstr() function returned incorrect results due to missing support for strstr(). This update adds this support, and calling SSE4 strstr() now returns correct results. (BZ#1366535)
• The fix for CVE-2016-5403 caused migrating guest instances to fail with a "Virtqueue size exceeded" error message. With this update, the value of the virtualization queue is recalculated after the migration, and the described problem no longer occurs. (BZ#1380306)
• Previously, the "virsh dump" command failed when both the --memory-only and --format options were used. This update fixes the underlying code, and "virsh dump" works as expected in the described circumstances. (BZ#1382645)

Users of qemu-kvm are advised to upgrade to these updated packages, which fix this bug. 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.

Solution

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

For details on how to apply this update, refer to:

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

Affected Products

• Red Hat Enterprise Linux for x86_64 - Extended Update Support 7.2 x86_64
• Red Hat Enterprise Linux Server - AUS 7.3 x86_64
• Red Hat Enterprise Linux Server - AUS 7.2 x86_64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.2 ppc64
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 7.2 ppc64le
• Red Hat Enterprise Linux Server - TUS 7.2 x86_64
• Red Hat Enterprise Linux EUS Compute Node 7.2 x86_64
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 7.2 x86_64

Fixes

• BZ - 1347527 - Regression from CVE-2016-3712: windows installer fails to start [rhel-7.2.z]
• BZ - 1366535 - qemu: accel=tcg does not implement SSE 4 properly
• BZ - 1380306 - RHSA-2016-1756 breaks migration of instances

CVEs

(none)

References

(none)