CVE-2026-31592: KVM: SEV: Protect all of sev_mem_enc_register_region() with kvm->lock

mediumCVSS 6.6CVE-2026-31592

CSIRTS triage

vendor: Linux product: Linux Kernel Privilege escalation

What: KVM SEV memory encryption registration lacks proper locking in sev_mem_enc_register_region().
Who is affected: Linux systems running KVM with AMD SEV encryption enabled.
Urgency: Medium-high priority; insufficient locking in SEV operations may allow privilege escalation.
Action: Apply Linux kernel patch addressing CVE-2026-31592.

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: medium — CVSS 6.6
Published: 2026-08-06
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-31592

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-2026-315920.12% 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-2026-31592	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

high[UPDATE] [high] Linux Kernel: Multiple Vulnerabilitiescert-bund
highUSN-8603-1: Linux kernel (Azure) vulnerabilitiesubuntu
highUSN-8569-1: Linux kernel (HWE) vulnerabilitiesubuntu
unknownSUSE Linux Kernel Multiple Vulnerabilitieshkcert

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.

highCVE-2026-74607: In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: Serialize access…nvd · 2026-08-22
unknownUSN-8667-1: Linux kernel (KVM) vulnerabilitiesubuntu · 2026-08-21
criticalCVE-2026-74568: In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: vgic: Fix race…nvd · 2026-08-15
criticalCVE-2026-74517: In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Cancel delayed I…nvd · 2026-08-15
highCVE-2026-74516: In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: Update x2APIC MS…nvd · 2026-08-15
highCVE-2026-74515: In the Linux kernel, the following vulnerability has been resolved: KVM: s390: pci: Reject ada…nvd · 2026-08-15

CVE-2026-31592: KVM: SEV: Protect *all* of sev_mem_enc_register_region() with kvm->lock