Detections
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Xen: Improper Handling of HVM Emulation Return Codes (XSA-510)

critical Nessus Plugin ID 344802

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Synopsis

The remote Xen hypervisor installation is missing a security update.

Description

A guest with a PCI device assigned that has at least a BAR on the IO port space can trigger a BUG() in Xen.

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 patch according to the vendor advisory.

See Also

https://xenbits.xenproject.org/xsa/advisory-510.html

Plugin Details

Severity: Critical

ID: 344802

File Name: xen_server_XSA-510.nasl

Version: 1.1

Type: Local

Family: Misc.

Published: 9/11/2026

Updated: 9/11/2026

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 93.41

CVSS v2

Risk Factor: Critical

Base Score: 10

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

CVSS Score Source: CVE-2026-79602

CVSS v3

Risk Factor: Critical

Base Score: 9.8

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

Vulnerability Information

CPE: cpe:/o:xen:xen

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

Patch Publication Date: 9/8/2026

Vulnerability Publication Date: 9/8/2026

Reference Information

CVE: CVE-2026-79602

IAVB: 2026-B-0250