Unscored USN-6244-1 1 CVE

amd64-microcode vulnerability

Published Jul 25, 2023 · Updated Jun 25, 2026

Ecosystem: Ubuntu

Summary

Tavis Ormandy discovered that some AMD processors did not properly handle
speculative execution of certain vector register instructions. A local attacker
could use this to expose sensitive information.

Fixed packages 4

Release	Package	Fixed in
Ubuntu · 20.04 LTS 20.04:LTS	amd64-microcode	3.20191218.1ubuntu1.1
Ubuntu · 22.04 LTS 22.04:LTS	amd64-microcode	3.20191218.1ubuntu2.1
Ubuntu · Pro 16.04 LTS Pro:16.04:LTS	amd64-microcode	3.20191021.1+really3.20180524.1~ubuntu0.16.04.2+esm1
Ubuntu · Pro 18.04 LTS Pro:18.04:LTS	amd64-microcode	3.20191021.1+really3.20181128.1~ubuntu0.18.04.1+esm1

Vulnerabilities 1

Unscored —

CVE-2023-20593 Public exploit

An issue in “Zen 2” CPUs, under specific microarchitectural circumstances, may allow an attacker to potentially access …

AMD 2nd Gen AMD EPYC™ Processors Ryzen™ 5000 Series Mobile Processors with Radeon™ Graphics “Lucienne” 3rd Gen AMD Ryzen™ Threadripper™ Processors “Castle Peak” HEDT Debian Ubuntu Alpine

Jul 24, 2023

References

report
https://ubuntu.com/security/CVE-2023-20593