CVE-2026-3196: Qemu-kvm: virtio-snd: integer overflow leading to unbounded memory allocation

mediumCVSS 5.5CVE-2026-3196

CSIRTS triage

vendor: Linux product: Qemu-kvm Memory corruption

What: An integer overflow can lead to unbounded memory allocation in virtio-snd.
Who is affected: Deployments using Qemu-kvm with virtio-snd support.
Urgency: Remediation is advised due to the medium severity rating.
Action: Update to the patched version of Qemu-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: medium — CVSS 5.5
Published: 2026-06-09
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-3196

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-2026-31960.10% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 1% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-3196	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

unknownMultiple vulnerabilities in Microsoft Azure Linux (July 7, 2026)cert-fr-avis

Recent advisories for Qemu-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.

mediumCVE-2026-48914: Qemu-kvm: heap buffer overflow in virtio-blk scsi request handlingmsrc · 2026-06-09
highCVE-2026-3195: Qemu-kvm: virtio-snd: heap buffer overflow in virtio_snd_pcm_in_cb (incomplete fix for cve-2024…msrc · 2026-06-09