(RHSA-2017:1856) Moderate: qemu-kvm security, bug fix, and enhancement update

Kernel-based Virtual Machine (KVM) is a full virtualization solution for Linux on a variety of architectures. The qemu-kvm package provides the user-space component for running virtual machines that use KVM.

Security Fix(es):

• An out-of-bounds memory access issue was found in Quick Emulator (QEMU) in the VNC display driver. This flaw could occur while refreshing the VNC display surface area in the ‘vnc_refresh_server_surface’. A user inside a guest could use this flaw to crash the QEMU process. (CVE-2017-2633)

• An integer overflow flaw was found in Quick Emulator (QEMU) in the CCID Card device support. The flaw could occur while passing messages via command/response packets to and from the host. A privileged user inside a guest could use this flaw to crash the QEMU process. (CVE-2017-5898)

• An information exposure flaw was found in Quick Emulator (QEMU) in Task Priority Register (TPR) optimizations for 32-bit Windows guests. The flaw could occur while accessing TPR. A privileged user inside a guest could use this issue to read portions of the host memory. (CVE-2016-4020)

Red Hat would like to thank Li Qiang (360.cn Inc.) for reporting CVE-2017-5898 and Donghai Zdh (Alibaba Inc.) for reporting CVE-2016-4020.

Additional Changes:

For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.4 Release Notes linked from the References section.