Red Hat Security Advisory 2018-2363-01 - KVM is a full virtualization solution for Linux on a variety of architectures. The qemu-kvm-rhev packages provide the user-space component for running virtual machines that use KVM in environments managed by Red Hat products. Security fix: An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of Load & Store instructions. 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. As a result, an unprivileged attacker could use this flaw to read privileged memory by conducting targeted cache side-channel attacks. Issues addressed include a bypass vulnerability.
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