VDB-351512 · CVE-2026-23554 · EUVD-2026-14382

Xen EPT use after free

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	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.
7.6	$0-$5k	0.00

Summaryinfo

A vulnerability classified as critical was found in Xen. The impacted element is an unknown function of the component EPT. Such manipulation leads to use after free. This vulnerability is uniquely identified as CVE-2026-23554. No exploit exists. Applying a patch is advised to resolve this issue.

Detailsinfo

A vulnerability was found in Xen (version unknown). It has been rated as critical. Affected by this issue is an unknown function of the component EPT. The manipulation with an unknown input leads to a use after free vulnerability. Using CWE to declare the problem leads to CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. Impacted is confidentiality, integrity, and availability.

The advisory is shared for download at xenbits.xen.org. This vulnerability is handled as CVE-2026-23554. The exploitation is known to be easy. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 03/23/2026).

The vulnerability scanner Nessus provides a plugin with the ID 302811 (Linux Distros Unpatched Vulnerability : CVE-2026-23554), 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 (302811), EUVD (EUVD-2026-14382) and CERT Bund (WID-SEC-2026-0760). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

Open Source Xen
Citrix Systems XenServer

Productinfo

Type

Virtualization Software

Name

License

open-source

CPE 2.3info

🔒

CPE 2.2info

🔒

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.0
VulDB Meta Temp Score: 7.6

VulDB Base Score: 8.0
VulDB Temp Score: 7.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

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

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 302811
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-23554

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-2026-23554 (🔒)
GCVE (CVE): GCVE-0-2026-23554
GCVE (VulDB): GCVE-100-351512
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

VulDB is the best source for vulnerability data and more expert information about this specific topic.