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CVE-2023-20592

Published: 14 November 2023

Improper or unexpected behavior of the INVD instruction in some AMD CPUs may allow an attacker with a malicious hypervisor to affect cache line write-back behavior of the CPU leading to a potential loss of guest virtual machine (VM) memory integrity.

Notes

AuthorNote
alexmurray
The microcode revisions listed in the AMD advisory AMD-SB-3005
were contained in the upstream commit
b250b32ab1d044953af2dc5e790819a7703b7ee6 - this was already provided to
the various Ubuntu releases in USN-6319-1 for CVE-2023-20569, as such they
are not affected by this CVE.

Priority

Medium

Cvss 3 Severity Score

6.5

Score breakdown

Status

Package Release Status
amd64-microcode
Launchpad, Ubuntu, Debian
upstream Needs triage

bionic Not vulnerable
(3.20191021.1+really3.20181128.1~ubuntu0.18.04.1+esm2)
focal Not vulnerable
(3.20191218.1ubuntu1.2)
jammy Not vulnerable
(3.20191218.1ubuntu2.2)
lunar Not vulnerable
(3.20220411.1ubuntu3.2)
mantic Not vulnerable
(3.20230808.1.1ubuntu1)
trusty Ignored
(no real-world users)
xenial Not vulnerable
(3.20191021.1+really3.20180524.1~ubuntu0.16.04.2+esm2)
Patches:
upstream: https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/commit/?id=b250b32ab1d044953af2dc5e790819a7703b7ee6

Severity score breakdown

Parameter Value
Base score 6.5
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact High
Availability impact None
Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N