CVE-2026-53359: KVM: x86: Fix shadow paging use-after-free due to unexpected role

highpublic exploitCVSS 7CVE-2026-53359

CSIRTS triage

vendor: null product: KVMOther

What: This vulnerability is a use-after-free issue due to unexpected role in shadow paging.
Who is affected: KVM users with x86 architecture.
Urgency: Remediation is necessary as it could lead to potential exploitation, although the severity is currently unknown.
Action: Apply the relevant patches for KVM.

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: 2026-07-02
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-53359

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-2026-533590.18% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 7% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-53359	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

medium[NEW] [medium] Linux Kernel: Multiple vulnerabilitiescert-bund
unknownMultiple vulnerabilities in Red Hat Linux kernel (July 10, 2026)cert-fr-avis
unknownDSA-6381-1 linux - security updatedebian
unknownCVE-2026-53359: In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Fix shadow pagin…nvd

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.

unknownCVE-2026-53360: In the Linux kernel, the following vulnerability has been resolved: KVM: SEV: Require in-GHCB …nvd · 2026-07-04
unknownCVE-2026-53359: In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Fix shadow pagin…nvd · 2026-07-04
mediumCVE-2026-53345: KVM: Don't WARN if memory is dirtied without a vCPU when the VM is dyingmsrc · 2026-07-02
unknownCVE-2026-53345: In the Linux kernel, the following vulnerability has been resolved: KVM: Don't WARN if memory …nvd · 2026-07-01
highCVE-2026-52969: KVM: Reject wrapped offset in kvm_reset_dirty_gfn()msrc · 2026-06-09
mediumCVE-2026-52968: KVM: s390: pci: fix GAIT table indexing due to double-scaling pointer arithmeticmsrc · 2026-06-09