CVE-2025-31648

Name	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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1127837

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
intel-microcode (PTS)	bullseye/non-free	3.20240813.1~deb11u1	vulnerable
	bullseye/non-free (security)	3.20250812.1~deb11u1	vulnerable
	bookworm/non-free-firmware	3.20251111.1~deb12u1	vulnerable
	bookworm/non-free-firmware (security)	3.20250812.1~deb12u1	vulnerable
	trixie/non-free-firmware	3.20251111.1~deb13u1	vulnerable
	trixie/non-free-firmware (security)	3.20250812.1~deb13u1	vulnerable
	forky/non-free-firmware, sid/non-free-firmware	3.20260210.1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
intel-microcode	source	(unstable)	3.20260210.1			1127837

Notes

[trixie] - intel-microcode <no-dsa> (Minor issue)
[bookworm] - intel-microcode <no-dsa> (Minor issue)
[bullseye] - intel-microcode <postponed> (Minor issue)
https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-01396.html
https://github.com/intel/Intel-Linux-Processor-Microcode-Data-Files/releases/tag/microcode-20260210-rev1