CVE-2025-31648

Description

Improper handling of values in the microcode flow for some Intel(R) Processor Family may allow an escalation of privilege. Startup code and smm adversary with a privileged user combined with a high complexity attack may enable escalation of privilege. This result may potentially occur via local access when attack requirements are present with special internal knowledge and requires no user interaction. The potential vulnerability may impact the confidentiality (low), integrity (low) and availability (none) of the vulnerable system, resulting in subsequent system confidentiality (low), integrity (low) and availability (none) impacts.

Read the notes from the security team

Why is this CVE low priority?

High complexity local attack with special internal knowledge needed

Learn more about Ubuntu priority

Status

Show unmaintained releases

Package	Ubuntu Release	Status
intel-microcode	25.10 questing	Fixed 3.20260210.0ubuntu0.25.10.1
	24.04 LTS noble	Fixed 3.20260210.0ubuntu0.24.04.1
	22.04 LTS jammy	Fixed 3.20260210.0ubuntu0.22.04.1
	20.04 LTS focal	Fixed 3.20260210.0ubuntu0.20.04.1+esm1
	18.04 LTS bionic	Fixed 3.20260210.0ubuntu0.18.04.1+esm1
	16.04 LTS xenial	Fixed 3.20260210.0ubuntu0.16.04.1+esm1
	14.04 LTS trusty	Ignored see Notes

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Notes

rodrigo-zaiden

trusty cannot use intel-microcode during early boot and is therefore generally not updated.

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
intel-microcode	Upstream: b24397c

Severity score breakdown

Parameter	Value
Base score	3.9 · Low
Attack vector	Local
Attack complexity	High
Privileges required	High
User interaction	None
Scope	Changed
Confidentiality	Low
Integrity impact	Low
Availability impact	None
Vector	CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N

References

Related Ubuntu Security Notices (USN)

USN-8068-1
Intel Microcode vulnerability
3 March 2026