CVE-2023-22655

Publication date 12 March 2024

Last updated 26 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

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.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
intel-microcode	24.04 LTS noble	Not affected
	23.10 mantic	Fixed 3.20240514.0ubuntu0.23.10.1
	22.04 LTS jammy	Fixed 3.20240514.0ubuntu0.22.04.1
	20.04 LTS focal	Fixed 3.20240514.0ubuntu0.20.04.1
	18.04 LTS bionic	Fixed 3.20240514.0ubuntu0.18.04.1+esm1
	16.04 LTS xenial	Fixed 3.20240514.0ubuntu0.16.04.1+esm1
	14.04 LTS trusty	Ignored trusty doesn't support early microcode loading at runtime

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Severity score breakdown

Parameter	Value
Base score	6.1 · Medium
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

References

Related Ubuntu Security Notices (USN)

USN-6797-1
Intel Microcode vulnerabilities
29 May 2024