Incomplete cleanup in some Intel(R) VT-d products may allow an authenticated user to potentially enable escalation of privilege via local access.
https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00442.html
https://www.debian.org/security/2021/dsa-4934
https://lists.debian.org/debian-lts-announce/2021/07/msg00022.html