Updating cpu microcode


Red Hat has been made aware of multiple microarchitectural (hardware) implementation issues affecting many modern microprocessors, requiring updates to the Linux kernel, virtualization-related components, and/or in combination with a microcode update.An unprivileged attacker can use these flaws to bypass conventional memory security restrictions in order to gain read access to privileged memory that would otherwise be inaccessible.It was brought to the attention of the Debian project that this defect is known to directly affect some Debian stable users (refer to the end of this advisory for details), thus this advisory.Please note that the defect can potentially affect any operating system (it is not restricted to Debian, and it is not restricted to Linux-based systems).Red Hat has released an updated Atomic Host for this use case.The attacks described in this article abuse the speculative execution capability of modern high-performance microprocessors.[WARNING] Intel Skylake/Kaby Lake processors: broken hyper-threading https://lists.debian.org/debian-devel/2017/06/msg00308This warning advisory is relevant for users of systems with the Intel processors code-named “Skylake” and “Kaby Lake”.These are: the 6th and 7th generation Intel Core processors (desktop, embedded, mobile and HEDT), their related server processors (such as Xeon v5 and Xeon v6), as well as select Intel Pentium processor models.



As a result, an unprivileged attacker could use these two flaws to read privileged memory by conducting targeted cache side-channel attacks.Out-of-Order (Oo O) Execution was originally invented by Robert Tomasulo in 1967 for use in the early IBM mainframe systems.



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