Red Hat Security Advisory 2015-2645-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. It was found that the x86 ISA is prone to a denial of service attack inside a virtualized environment in the form of an infinite loop in the microcode due to the way delivering of benign exceptions such as #AC and #DB is handled. A privileged user inside a guest could use these flaws to create denial of service conditions on the host kernel.
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