Xen

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.
3.5$5k-$25k5.45-

Summaryinfo

A vulnerability has been found in Xen and classified as problematic. This vulnerability affects unknown code. The manipulation leads to an unknown weakness. This vulnerability is documented as CVE-2026-42488. There is not any exploit available.

Detailsinfo

A vulnerability was found in Xen (the affected version unknown). It has been rated as problematic. Impacted is integrity. The summary by CVE is:

Some shadow paging errors paths will switch the page-tables without updating the currently running vCPU reference. This causes a mismatch between the loaded page-tables and the mapcache metadata which can lead to corruption of the mapcache.

The weakness was released by This Issue Was Discovered By Roger Pau Monné. The advisory is shared at xenbits.xenproject.org. The identification of this vulnerability is CVE-2026-42488 since 04/27/2026. The exploitation is known to be easy. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 06/19/2026).

The vulnerability scanner Nessus provides a plugin with the ID 321439 (Fedora 44 : xen (2026-24b84f97af)), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Tenable (321439). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

Name

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.5
VulDB Meta Temp Score: 3.5

VulDB Base Score: 3.5
VulDB Temp Score: 3.5
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: Unknown
CWE: Unknown
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Partially

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 321439
Nessus Name: Fedora 44 : xen (2026-24b84f97af)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

04/27/2026 CVE reserved
06/18/2026 +52 days Advisory disclosed
06/18/2026 +0 days VulDB entry created
06/19/2026 +1 days VulDB entry last update

Sourcesinfo

Advisory: xenbits.xenproject.org
Researcher: This Issue Was Discovered By Roger Pau Monné
Status: Confirmed

CVE: CVE-2026-42488 (🔒)
GCVE (CVE): GCVE-0-2026-42488
GCVE (VulDB): GCVE-100-372221

Entryinfo

Created: 06/18/2026 17:29
Updated: 06/19/2026 05:42
Changes: 06/18/2026 17:29 (50), 06/19/2026 05:42 (2)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Discussion

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