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Major Hyper-Threading Flaw in Intel Kay Lake And Skylake CPUs Could Wipe Data And Crash Systems

As News Editor of Silicon UK, Roland keeps a keen eye on the daily tech news coverage for the site, while also focusing on stories around cyber security, public sector IT, innovation, AI, and gadgets.

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The major flaw, discovered by Debian developers, can be stopped by disabling Hyper-Threading

A major flaw in the hyper-threading capabilities of Intel’s Kaby Lake and Skylake central processing units (CPU) could destabilise the processors and lead to data loss and system crashes. 

The flaw was discovered and reported by developers of Linux-based operating system Debian, who noted it has the potential to wreak havoc for Windows based systems as well.

Intel inside problems 

intel-chipIntel’s Hyper-Threading is the term given to the process the chipmaker uses to run tasks across the multiple core found in modern processors at the same time. 

However, the Debian developers uncovered what is called an errata flaw, an error in a CPUs hardwired logic, which has the potential to destabilise Intel’s six and seventh generation processors and throw-up unpredictable behaviour. 

“Under complex micro-architectural conditions, short loops of less than 64 instructions that use AH, BH, CH or DH registers as well as their corresponding wider register (e.g. RAX, EAX or AX for AH) may cause unpredictable system behaviour. This can only happen when both logical processors on the same physical processor are active,” Intel’s documentation on the errata explained. 

There are two ways to avoid running into the error, the first being the obvious route of disabling Hyper-Threading; an inelegant solution to the problem especially if users of affected Intel CPUs make regular use of the performance enhancing feature. 

The second option is to wait for the vendor of the motherboard being used with the CPU to roll out a new version of the Unified Extensible Firmware Interface (UEFI) or BIOS that provides a fix for the errata. The latter option may not be ideal as users are at the mercy of the motherboard vendors update plans. 

For Intel the discovery of such a flaw comes at a time when AMD is pushing out new CPUs for both data centre use and for the consumer and power-user PC market, and Intel has just showcased it 18 core Core i9 processor; the discovery of a Hyper-Threading flaw could cause people to loose a healthy dose of confidence in the CPU giant. 

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