CVE-2026-53345: KVM: Don't WARN if memory is dirtied without a vCPU when the VM is dying

mediumCVSS 6.5CVE-2026-53345

CSIRTS triage

Other

What: This vulnerability involves not warning if memory is dirtied without a vCPU when the VM is dying.
Who is affected: Affected systems are those utilizing KVM virtualization.
Urgency: Medium urgency for remediation due to a CVSS score of 6.5.
Action: Monitor for patches or updates addressing this issue.

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

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: medium — CVSS 6.5
Published: 2026-07-02
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-53345

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-2026-533450.16% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 5% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-53345	coverage & exploitation status	NVD · 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.

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
highCVE-2026-53359: KVM: x86: Fix shadow paging use-after-free due to unexpected rolemsrc · 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-2026-3196: Qemu-kvm: virtio-snd: integer overflow leading to unbounded memory allocationmsrc · 2026-06-09