qemu security update

2018-05-22T18:17:51
ID CESA-2018:1633
Type centos
Reporter CentOS Project
Modified 2018-05-22T18:17:51

Description

CentOS Errata and Security Advisory CESA-2018:1633

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

Security Fix(es):

  • An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of Load & Store instructions (a commonly used performance optimization). It relies on the presence of a precisely-defined instruction sequence in the privileged code as well as the fact that memory read from address to which a recent memory write has occurred may see an older value and subsequently cause an update into the microprocessor's data cache even for speculatively executed instructions that never actually commit (retire). As a result, an unprivileged attacker could use this flaw to read privileged memory by conducting targeted cache side-channel attacks. (CVE-2018-3639)

Note: This is the qemu-kvm side of the CVE-2018-3639 mitigation.

Red Hat would like to thank Ken Johnson (Microsoft Security Response Center) and Jann Horn (Google Project Zero) for reporting this issue.

Merged security bulletin from advisories: http://lists.centos.org/pipermail/centos-announce/2018-May/022842.html

Affected packages: qemu-img qemu-kvm qemu-kvm-common qemu-kvm-tools

Upstream details at: