Xen: Mehrere Schwachstellen
WID-SEC-2026-3248 · first 09.09.2026 · updated 19.10.2026 · CVSS 8,4
What it is about
Xen ist ein Virtueller-Maschinen-Monitor (VMM), der Hardware (x86, IA-64, PowerPC) für die darauf laufenden Systeme (Domains) paravirtualisiert. Ein Angreifer kann mehrere Schwachstellen in Xen ausnutzen, um einen Denial of Service Angriff durchzuführen, beliebigen Code auszuführen, Sicherheitsmaßnahmen zu umgehen und Daten zu manipulieren.
Under what conditions?
The BSI does not name any particular preconditions.
What can happen in the worst case
An attacker could use the vulnerability to
- einen Denial of Service Angriff durchzuführen
- beliebigen Code auszuführen
- Sicherheitsmaßnahmen zu umgehen
- Daten zu manipulieren
Am I affected?
Affected according to the BSI:
- Debian Linux
- Fedora Linux
- SUSE Linux
- Open Source Xen 4.17.x
- Open Source Xen 4.22.x
- Open Source Xen 4.21.x
- Open Source Xen 4.20.x
- Open Source Xen 4.19.x
- Open Source Xen 4.18.x
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Install the updates provided by the vendor; details in the sources below.
Is the vulnerability already being exploited?
None of the CVEs is in the CISA catalogue of exploited vulnerabilities. That does not mean there are no attacks, only that none are documented.
Information and sources
- Original BSI advisory (WID)
- Xen Security Advisory XSA-509 vom 2026-09-08 xenbits.xen.org
- Xen Security Advisory XSA-510 vom 2026-09-08 xenbits.xen.org
- Xen Security Advisory XSA-511 vom 2026-09-08 xenbits.xen.org
- Xen Security Advisory XSA-512 vom 2026-09-08 xenbits.xen.org
- Xen Security Advisory XSA-513 vom 2026-09-08 xenbits.xen.org
- SUSE Security Update SUSE-SU-2026:4089-1 vom 2026-09-13 lists.suse.com
- SUSE Security Update SUSE-SU-2026:4087-1 vom 2026-09-13 lists.suse.com
- SUSE Security Update SUSE-SU-2026:4090-1 vom 2026-09-13 lists.suse.com
- SUSE Security Update SUSE-SU-2026:4088-1 vom 2026-09-13 lists.suse.com
- Fedora Security Advisory FEDORA-2026-1D448C1D40 vom 2026-09-16 bodhi.fedoraproject.org
- Debian Security Advisory DSA-6571 vom 2026-10-18 security-tracker.debian.org
CVE: CVE-2026-62437, CVE-2026-79602, CVE-2026-79603, CVE-2026-79604, CVE-2026-79605, CVE-2026-79606
Source: BSI warning and information service (CERT-Bund); CISA. The assessment of the conditions is my reading of the BSI text; the external pages are in their original language.