Detections
Analytics

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

high Nessus Plugin ID 344802

Language:

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: High

ID: 344802

File Name: xen_server_XSA-510.nasl

Version: 1.2

Type: Local

Family: Misc.

Published: 9/11/2026

Updated: 9/14/2026

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 93.4

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

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

CVSS Score Source: CVE-2026-79602

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

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

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:xen:xen

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

Exploit Ease: No known exploits are available

Patch Publication Date: 9/8/2026

Vulnerability Publication Date: 9/8/2026

Reference Information

CVE: CVE-2026-79602

IAVB: 2026-B-0250