CVE-2025-35979

Name	CVE-2025-35979
Description	Exposure of sensitive information caused by shared microarchitectural predictor state that influences transient execution for some Intel(R) Processors within VMX non-root (guest) operation may allow an information disclosure. Unprivileged software adversary with an authenticated user combined with a high complexity attack may enable data exposure. This result may potentially occur via local access when attack requirements are present without special internal knowledge and requires no user interaction. The potential vulnerability may impact the confidentiality (high), integrity (none) and availability (none) of the vulnerable system, resulting in subsequent system confidentiality (high), integrity (none) 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)

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
	sid/non-free-firmware, forky/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)

Notes

https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-01420.html
https://github.com/intel/Intel-Linux-Processor-Microcode-Data-Files/releases/tag/microcode-20260512