---
title: "CVE-2026-98156: Linux Kernel - Broken Access Control"
description: "Linux kernel contains a broken access control vulnerability in virtio-gpu on Xen PV domains caused by improper use of DMA API for resource backing, letting attackers cause host to scan unrelated memory, exploit requires running in a Xen PV domain."
url: https://panop.io/threat-heartbeat/CVE-2026-98156/
---

# CVE-2026-98156 Linux Kernel - Broken Access Control

Linux kernel contains a broken access control vulnerability in virtio-gpu on Xen PV domains caused by improper use of DMA API for resource backing, letting attackers cause host to scan unrelated memory, exploit requires running in a Xen PV domain.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.13% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-98156)

## Details

Type

Broken Access Control

Impact

Information Disclosure, Denial Of Service

CVSS vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Published

25 September 2026

Updated

15 October 2026

Weakness

[NVD-CWE-noinfo](https://cwe.mitre.org/data/definitions/NVD-CWE-noinfo.html)

## Vendor fix

Update to a Linux kernel version including the fix for virtio-gpu DMA API usage on Xen PV domains, such as 6.8 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-98156](https://nvd.nist.gov/vuln/detail/CVE-2026-98156)
- [https://git.kernel.org/stable/c/455184dbe9652d01470d3c5cf5edd09a7a673a99](https://git.kernel.org/stable/c/455184dbe9652d01470d3c5cf5edd09a7a673a99)
- [https://git.kernel.org/stable/c/6a736d2f9d0c6e6217fe7532bc4c50ceca71db78](https://git.kernel.org/stable/c/6a736d2f9d0c6e6217fe7532bc4c50ceca71db78)
- [https://git.kernel.org/stable/c/93c557e947ef0040004b1ac6a1c1265d79a957e1](https://git.kernel.org/stable/c/93c557e947ef0040004b1ac6a1c1265d79a957e1)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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