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CVE-2021-38576

Published: 3 January 2022

A BIOS bug in firmware for a particular PC model leaves the Platform authorization value empty. This can be used to permanently brick the TPM in multiple ways, as well as to non-permanently DoS the system.

Notes

AuthorNote
Priority reason:
edk2 package can't be bricked like real hardware

Priority

Low

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
edk2
Launchpad, Ubuntu, Debian
lunar Not vulnerable
(2022.11-6)
trusty Ignored
(end of standard support)
upstream Needs triage

xenial Needs triage

hirsute Ignored
(end of life)
impish Ignored
(end of life)
bionic Needed

focal Needed

jammy Not vulnerable
(2022.02-3ubuntu0.22.04.1)
kinetic Not vulnerable
(2022.05-4)
mantic Not vulnerable
(2023.02-2)
Patches:
upstream: https://github.com/tianocore/edk2/pull/1968

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H