Xen Xenstored denial of service

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.5$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in Xen. This affects an unknown function of the component Xenstored. Performing a manipulation results in denial of service. This vulnerability was named CVE-2026-23555. There is no available exploit. It is suggested to install a patch to address this issue.

Detailsinfo

A vulnerability classified as critical has been found in Xen (affected version unknown). This affects an unknown functionality of the component Xenstored. The manipulation with an unknown input leads to a denial of service vulnerability. CWE is classifying the issue as CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. This is going to have an impact on availability.

The advisory is shared at xenbits.xen.org. This vulnerability is uniquely identified as CVE-2026-23555. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 302813 (Linux Distros Unpatched Vulnerability : CVE-2026-23555), which helps to determine the existence of the flaw in a target environment.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at xenbits.xen.org.

The vulnerability is also documented in the databases at Tenable (302813), EUVD (EUVD-2026-14383) and CERT Bund (WID-SEC-2026-0760). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

  • Open Source Xen
  • Citrix Systems XenServer

Productinfo

Type

Name

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.7
VulDB Meta Temp Score: 5.5

VulDB Base Score: 5.7
VulDB Temp Score: 5.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 302813
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-23555

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔒

Patch: xenbits.xen.org

Timelineinfo

03/18/2026 Advisory disclosed
03/18/2026 +0 days VulDB entry created
03/23/2026 +5 days VulDB entry last update

Sourcesinfo

Advisory: xenbits.xen.org
Status: Confirmed

CVE: CVE-2026-23555 (🔒)
GCVE (CVE): GCVE-0-2026-23555
GCVE (VulDB): GCVE-100-351513
EUVD: 🔒
CERT Bund: WID-SEC-2026-0760 - Xen und Citrix Systems XenServer: Mehrere Schwachstellen

Entryinfo

Created: 03/18/2026 09:24
Updated: 03/23/2026 10:27
Changes: 03/18/2026 09:24 (51), 03/18/2026 10:58 (2), 03/18/2026 12:12 (7), 03/23/2026 10:27 (1)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion

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