# CERT-FR Flags Multiple Xen Hypervisor Flaws

Published: 2026-07-29 · Severity: medium · Sectors: technology, infrastructure
Canonical: https://vorant.io/reports/e4110d96-7070-5d9a-8bb2-1b337dc3de2b/cert-fr-flags-multiple-xen-hypervisor-flaws

> CERT-FR advises patching Xen after 13 vulnerabilities across 13 XSA bulletins were disclosed, enabling privilege escalation, DoS, and data exposure.

CERT-FR has issued an advisory covering multiple vulnerabilities in the Xen hypervisor, disclosed via 13 separate Xen Security Advisories (XSA-495 through XSA-508) published on 28 July 2026. The flaws collectively affect all Xen versions lacking the latest security patches, and could allow an attacker to achieve privilege escalation, cause remote denial of service, or compromise data confidentiality.

No evidence of active exploitation is mentioned in the advisory, and no specific threat actor or malware is associated with these vulnerabilities. Organizations running Xen-based virtualization infrastructure should consult the vendor bulletins and apply the corresponding patches promptly, given the potential for guest-to-host or cross-tenant impact typical of hypervisor-level flaws in virtualized/cloud environments.

## Mentioned in this report

- Vulnerabilities: CVE-2026-42492, CVE-2026-42493, CVE-2026-42494, CVE-2026-42495, CVE-2026-62423, CVE-2026-62424, CVE-2026-62425, CVE-2026-62426, CVE-2026-62427, CVE-2026-62428, CVE-2026-62429, CVE-2026-62430, CVE-2026-62431, CVE-2026-62432, CVE-2026-62433, CVE-2026-62434, CVE-2026-62435, CVE-2026-62436

Source reporting: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-0942

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