CVE-2025-35973

Name	CVE-2025-35973
Description	Improper handling of values for some Intel(R) Processors within Ring 0: Kernel, Hypervisor and Bare Metal OS may allow an escalation of privilege. Authorized 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 require 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 (high), integrity (high) 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	1144158

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
intel-microcode (PTS)	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	3.20260227.1	vulnerable

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)	(unfixed)			1144158

Notes

[trixie] - intel-microcode <postponed> (As usual fixed top-down, expose first in unstable, then likely point release)
https://github.com/intel/Intel-Linux-Processor-Microcode-Data-Files/releases/tag/microcode-20260811
https://www.cve.org/CVERecord?id=CVE-2025-35973