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CVE-2026-23555

Xenstored DoS by unprivileged domain

Published: Mar 23, 2026Updated: Apr 10, 2026 Sources: CVE List NVDCWE-617
NVD MITRE
7.1CVSSHIGH
EPSS Score
0.2%
Top 92.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

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.

CVSS Vector Breakdown

AV:LAC:LPR:NUI:NS:CC:NI:NA:H
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-617

Affected Products

xenxen
On-prem
Cloud & SaaS / virtualization
XenXen
On-prem
Cloud & SaaS / virtualization
xenoss-projectGBCloud & SaaSaka xapi, qemu

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available
Workaround Available

MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://xenbits.xenproject.org/xsa/advisory-481.html
xenbits.xenproject.org
http://www.openwall.com/lists/oss-security/2026/03/17/7
openwall.com
http://xenbits.xen.org/xsa/advisory-481.html
xenbits.xen.org

Timeline

Published
Mar 23, 2026
Last Updated
Apr 10, 2026

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