---
id: CVE-2026-79602
title: |-
  A guest with a PCI device assigned that has at least a BAR on the IO port
  space can trigger a BUG() in Xen.
summary: |-
  A guest with a PCI device assigned that has at least a BAR on the IO port
  space can trigger a BUG() in Xen.
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H'
cwe:
  - CWE-119
vendor: Xen
product: Xen
affected:
  - Xen
published: '2026-09-08'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T19:17:34.963'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-79602'
references:
  - url: 'https://xenbits.xenproject.org/xsa/advisory-510.html'
    label: security@xen.org
  - url: 'http://www.openwall.com/lists/oss-security/2026/09/08/7'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://xenbits.xen.org/xsa/advisory-510.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-79602.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-79602'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-79602'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
  - score-dispute
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-10T18:08:16.213605Z'
epss: 0.0013
epssPercentile: 0.03
scores:
  nvd: 8.8
  vendor: 6
  adp: 8.8
ingestedAt: '2026-09-08T15:33:26.984Z'
---

## Overview

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

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · updated 2026-09-08 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-79602.json)