CVE-2026-46032: KVM: nSVM: Triple fault if restore host CR3 fails on nested #VMEXIT

highCVSS 7CVE-2026-46032

CSIRTS triage

vendor: Linux product: KVM Denial of service Memory corruption

What: Nested VM exits can trigger a triple fault if host CR3 restoration fails during nSVM operation.
Who is affected: KVM hypervisor hosts running nested virtual machines.
Urgency: High priority; can cause host crash and potential guest escape in nested virtualization setups.
Action: Apply latest kernel patch for KVM nSVM handling.

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

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: high — CVSS 7
Published: 2026-08-06
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-46032

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.

Low exploitation riskCVE-2026-460320.12% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 2% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-46032	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

highUSN-8603-1: Linux kernel (Azure) vulnerabilitiesubuntu
highUSN-8569-1: Linux kernel (HWE) vulnerabilitiesubuntu

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