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Published: 12 March 2024

Protection mechanism failure in some 3rd and 4th Generation Intel(R) Xeon(R) Processors when using Intel(R) SGX or Intel(R) TDX may allow a privileged user to potentially enable escalation of privilege via local access.

From the Ubuntu Security Team

It was discovered that some 3rd and 4th Generation Intel® Xeon® Processors did not properly restrict access to certain hardware features when using Intel® SGX or Intel® TDX. This may allow a privileged local user to potentially further escalate their privileges on the system.



Cvss 3 Severity Score


Score breakdown


Package Release Status
Launchpad, Ubuntu, Debian
bionic Needed

focal Needed

jammy Needed

mantic Needed

trusty Ignored
(trusty doesn't support early microcode loading at runtime)
upstream Needs triage

xenial Needed

Severity score breakdown

Parameter Value
Base score 6.1
Attack vector Local
Attack complexity High
Privileges required High
User interaction None
Scope Changed
Confidentiality Low
Integrity impact High
Availability impact None
Vector CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:L/I:H/A:N