Red Hat Security Advisory 2016-0855-01 – The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix: It was found that reporting emulation failures to user space could lead to either a local or a L2->L1 denial of service. In the case of a local denial of service, an attacker must have access to the MMIO area or be able to access an I/O port. Please note that on certain systems, HPET is mapped to userspace as part of vdso and thus an unprivileged user may generate MMIO transactions this way.