CVE-2026-68428: KVM: x86/mmu: Fix use-after-free on vendor module reload

mediumCVSS 4.1CVE-2026-68428

CSIRTS triage

vendor: Linux product: Linux kernel Memory corruption

What: A use-after-free vulnerability exists in the KVM x86 MMU code when vendor modules are reloaded.
Who is affected: Systems running KVM with x86 CPU virtualization on affected kernel versions.
Urgency: High; use-after-free vulnerabilities are severe and can enable privilege escalation or code execution.
Action: Apply kernel patch immediately or disable KVM module reloading until patched.

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 4.1
Published: 2026-08-11
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-68428

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-2026-684280.16% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 6% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-68428	coverage & exploitation status	NVD · CVE.org

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