Xen Patches Three Privilege Escalation Flaws
CERT-FR reports multiple Xen vulnerabilities enabling privilege escalation, data exposure, and denial of service; patches available.
Sourcecert.cyber.gouv.fr — open the original
What to check
- Applies to
- The 3 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.
CERT-FR issued an advisory covering three vulnerabilities in Xen hypervisor, referenced via Xen Security Advisories XSA-526, XSA-527, and XSA-528, all published by the Xen Project on 6 November 2026. The flaws, tracked as CVE-2026-100080, CVE-2026-100081, and CVE-2026-100082, affect all Xen versions that have not applied the latest security patches.
Successful exploitation could allow an attacker to achieve privilege escalation, compromise data confidentiality, or cause a denial of service. No technical details of exploitation mechanics are provided in this bulletin, and there is no indication of active in-the-wild exploitation. Defenders running Xen hypervisors, particularly in virtualization and cloud infrastructure environments, should consult the referenced Xen Security Advisories and apply the corresponding patches without delay, as hypervisor-level compromises can affect all guest VMs on an affected host.
Mentioned in this report
Source reporting: https://www.cert.cyber.gouv.fr/avis/CERTFR-2026-AVI-1485
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