Vulnerability in Xen

[ Description ]Official description

During Xenstore live update the state record for a Xenstore watch with specified watch depth is written with two bytes missing. This results in an inconsistent state when reading the state back in the new Xenstore, causing a crash of Xenstore or wrong Xenstore data.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• CERT-FR14 Oct 2026CERTFR-2026-AVI-1302

  Multiple vulnerabilities in Xen Translated from French

  Multiple vulnerabilities have been discovered in Xen. Some of them allow an attacker to cause arbitrary code execution, privilege escalation and a breach of data confidentiality.

  CVE-2026-79611CVE-2023-34321CVE-2026-102700+10 more CVEs
• BSI CERT-Bund13 Oct 2026WID-SEC-2026-3930

  Xen: Multiple vulnerabilities Translated from German

  CVE-2026-102701CVE-2026-79610CVE-2026-102700+6 more CVEs

[ References ]References

• xenbits.xenproject.org/xsa/advisory-514.html
• www.openwall.com/lists/oss-security/2026/10/13/3
• xenbits.xen.org/xsa/advisory-514.html