CVE-2026-23556

oxenstored keeps quota related use counts across domain destruction

Published Jul 9, 2026 CVSS 4.0 · 9.4 Critical EPSS < 1% KEV · Not listed
Description
When oxenstored is tearing a domain down, the node data is cleaned up
but the usage counts are leaked.

When the domain ID is eventually reused, the new domain can create fewer
nodes before beeing deemed to be over quota.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DLA Debian DLA DLA-4818-1 xen security update
Debian DSA Debian DSA DSA-6424-1 xen security update
History
Type Values Removed Values Added
First Time appeared Xen
Xen oxenstored
Vendors & Products Xen
Xen oxenstored
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description When oxenstored is tearing a domain down, the node data is cleaned up but the usage counts are leaked. When the domain ID is eventually reused, the new domain can create fewer nodes before beeing deemed to be over quota.
Title oxenstored keeps quota related use counts across domain destruction
Weaknesses CWE-281
References
Metrics cvssV4_0

{'score': 9.4, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
XEN
Published
Updated
Jul 9, 2026, 3:37 PM
Reserved
Jan 14, 2026, 1:07 PM
Status
Deferred
Published
Jul 9, 2026, 4:16 PM
Modified
Oct 25, 2026, 5:10 PM