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Citrix XenServer Multiple Vulnerabilities (XSA-472)

high Nessus Plugin ID 264553

Synopsis

The remote Xen hypervisor installation is missing a security update.

Description

According to its self-reported version number, the Xen hypervisor installed on the remote host is affected by multiple vulnerabilities:

 - A NULL pointer dereference in the updating of the reference TSC area. (CVE-2025-27466)

 - A NULL pointer dereference by assuming the SIM page is mapped when a synthetic timer message has to be delivered. (CVE-2025-58142)

 - A race in the mapping of the reference TSC page, where a guest can get Xen to free a page while still present in the guest physical to machine (p2m) page tables. (CVE-2025-58143)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Apply the appropriate hotfix according to the vendor advisory.

See Also

https://xenbits.xen.org/xsa/advisory-472.html

Plugin Details

Severity: High

ID: 264553

File Name: xen_server_XSA-472.nasl

Version: 1.2

Type: local

Family: Misc.

Published: 9/11/2025

Updated: 9/12/2025

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: High

Base Score: 7.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2025-27466

CVSS v3

Risk Factor: High

Base Score: 7.1

Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Vulnerability Information

CPE: cpe:/a:citrix:xenserver

Required KB Items: installed_sw/Xen Hypervisor, Settings/ParanoidReport

Patch Publication Date: 9/9/2025

Vulnerability Publication Date: 9/9/2025

Reference Information

CVE: CVE-2025-27466, CVE-2025-58142, CVE-2025-58143

IAVA: 2025-A-0656