New Reptar CPU flaw impacts Intel desktop and server systems


With the most recent Alder Lake, Raptor Lake, and Sapphire Rapids microarchitectures as well as its desktop, server, mobile, and embedded CPUs, Intel has resolved a high-severity CPU vulnerability.

The vulnerability, known as a “Redundant Prefix Issue” and tagged as CVE-2023-23583, allows attackers to escalate privileges, get sensitive data, or cause a denial of service condition.

“Under certain microarchitectural conditions, Intel has identified cases where execution of an instruction (REP MOVSB) encoded with a redundant REX prefix may result in unpredictable system behavior resulting in a system crash/hang, or, in some limited scenarios, may allow escalation of privilege (EoP) from CPL3 to CPL0,” said Intel.

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