CVE-2023-23583: Intel - Denial of Service - Privilege Escalation (Reptar)

[Antonio Gomez Iglesias <antonio.gomez.iglesias () intel com>]

Name of the issue: Redundant Prefix Issue


Description of the issue
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 from CPL3 to CPL0.
This Redundant Prefix Issue is assigned CVE-2023-23583 with a CVSS Base
Score of 8.8 High CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.


Mitigation
Intel is providing a microcode update to mitigate this issue: 
https://github.com/intel/Intel-Linux-Processor-Microcode-Data-Files/releases/tag/microcode-20231114