# CERT-FR Patches Multiple Xen Hypervisor Flaws

Published: 2026-11-12 · Severity: routine · Sectors: Technology, Infrastructure
Canonical: https://vorant.io/reports/a2cbfb64-b8d6-5a36-af22-361432373b65/cert-fr-patches-multiple-xen-hypervisor-flaws
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> CERT-FR advisory covers multiple Xen vulnerabilities allowing privilege escalation, data exposure, DoS, and security bypass; patches available.

Source: cert.cyber.gouv.fr — https://www.cert.cyber.gouv.fr/avis/CERTFR-2026-AVI-1508

## What to check

- Applies to: The 12 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 has published an advisory detailing multiple vulnerabilities in the Xen hypervisor, affecting XAPI master (all versions without the latest security patch), Xen for Linux (versions prior to the xsa532-linux.patch fix), and Xen versions 4.17.x through 4.21.x lacking their respective security patches. The flaws, referenced across Xen Security Advisories XSA-524, 525, 529, 530, 531, and 532, can allow an attacker to achieve privilege escalation, breach data confidentiality, bypass security policies, or cause denial of service.

Nine CVEs are associated with this advisory, spanning identifiers from 2024 (CVE-2024-21963, CVE-2024-36350, CVE-2024-36357) through 2026 (CVE-2026-0004, CVE-2026-102705 through 102708, CVE-2026-119779, CVE-2026-119780, CVE-2026-99286, CVE-2026-99287). No in-the-wild exploitation is indicated in the advisory. Defenders operating Xen-based virtualization infrastructure, including XenServer/XCP-ng deployments using XAPI, should consult the vendor's Xen Security Advisory pages for patch details and apply the relevant fixes to affected versions promptly, as hypervisor-level vulnerabilities can impact multi-tenant isolation and host confidentiality.

This is a routine CERT-FR vulnerability bulletin aggregating vendor-issued security advisories; it does not describe active exploitation or a specific campaign, and organizations should prioritize patching based on their exposure to the affected Xen and XAPI versions.

## Mentioned in this report

- Vulnerabilities: CVE-2024-21963, CVE-2024-36350, CVE-2024-36357, CVE-2026-0004, CVE-2026-102705, CVE-2026-102706, CVE-2026-102707, CVE-2026-102708, CVE-2026-119779, CVE-2026-119780, CVE-2026-99286, CVE-2026-99287

Source reporting: https://www.cert.cyber.gouv.fr/avis/CERTFR-2026-AVI-1508

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