CSIRTS // UNIFIED SECURITY ADVISORY FEEDSYS ● ONLINE · POWERED BY INTELFUSIONS.COM

← Back to feed

CVE-2026-46014: KVM: SVM: Add missing save/restore handling of LBR MSRs

mediumCVSS 5.5CVE-2026-46014

CSIRTS triage

vendor: Linuxproduct: Linux KernelInformation disclosure
What
KVM SVM hypervisor is missing save/restore handling of LBR (Last Branch Record) MSRs, potentially leaking CPU branch information.
Who is affected
Systems using KVM with AMD SVM virtualization that may expose LBR state between VMs.
Urgency
Medium severity (CVSS 5.5) information disclosure; exploitation unlikely but information leakage risk exists.
Action
Apply kernel patch to add proper LBR MSR save/restore handling in KVM SVM code.

AI-assisted analysis generated from the source advisory — verify against the original.

⚡ Watch Linux Kernel

Get an email when a new Linux Kernel advisory drops — max one per day, one-click unsubscribe.

Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
medium — CVSS 5.5
Published
2026-08-06
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-46014

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-46014coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for KVM

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

More from Microsoft Security Response Center