ANSSI flags multiple Xen hypervisor flaws
ANSSI advisory details six CVEs in Xen enabling arbitrary code execution, remote denial of service, and security bypass; patches available.
Sourcecert.ssi.gouv.fr — open the original
What to check
- Applies to
- The 6 CVEs named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation
- No exploitation in the wild and no public exploit is recorded for the CVEs named.
The French national cybersecurity agency ANSSI (CERT-FR) issued an advisory covering multiple vulnerabilities in the Xen hypervisor, affecting all versions lacking the latest security patches. The flaws, tracked as XSA-509 through XSA-513 and assigned six CVE identifiers, allow attackers to bypass security policies, cause remote denial of service, and in some cases execute arbitrary code.
No exploitation in the wild is mentioned in the advisory. ANSSI recommends organizations refer to the official Xen Project security bulletins for patches and apply them promptly. Given Xen's widespread use as a virtualization platform underpinning cloud and enterprise infrastructure, unpatched systems could expose hosted workloads to compromise or service disruption, particularly in multi-tenant environments where hypervisor security bypasses have outsized impact.
Mentioned in this report
Source reporting: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-1136
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