← Back to home
wid-sec-w-2026-0760  ·  Published 2026-03-17  ·  View on BSI CERT-Bund ↗

Xen and Citrix Systems XenServer: Multiple Vulnerabilities

CVSS 7.8 HIGH

Risk Summary

Any guest issuing a Xenstore command accessing a node using the (illegal) node path "/local/domain/", will crash xenstored due to a clobbered error indicator in xenstored when verifying the node path. Note that the crash is forced via a failing assert() statement in xenstored. In case xenstored is being built with NDEBUG #defined, an unprivileged guest trying to access the node path "/local/domain/" will result in it no longer being serviced by xenstored, other guests (including dom0) will still be serviced, but xenstored will use up all cpu time it can get.

Affected Vendors

Citrix Systems Fedora Open Source SUSE

Affected Products (5)

Citrix Systems · XenServer 8.4
Open Source · Xen >=4.17
Open Source · Xen >=4.17
Open Source · Xen >=4.18
Open Source · Xen >=4.18

Get alerted to advisories like this

OTWarden monitors CISA, BSI, Siemens, Rockwell and more — and emails you within 2 hours when your vendors are affected.

Start free trial Learn more