A design flaw in the x86 processor architecture dating back almost two decades could allow attackers to install a rootkit in the low-level firmware of computers, a security researcher said Thursday. Such malware could be undetectable by security products.

The vulnerability stems from a feature first added to the x86 architecture in 1997. It was disclosed Thursday at the Black Hat security conference by Christopher Domas, a security researcher with the Battelle Memorial Institute.

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