---
id: CVE-2026-98786
title: >-
  kernel: drm/amd/display: guard dc_sink dereferences in MST mode validation
  (CVE-2026-98786)
summary: >-
  A flaw was found in the Linux kernel's AMD GPU display driver. During
  DisplayPort Multi-Stream Transport (MST) display disconnection, a race
  condition can cause the driver to access display data structures without
  verifying that they remai…
severity: medium
cvss: 4.7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe: CWE-476
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 10
  - enterprise_linux 6
  - enterprise_linux 8
  - enterprise_linux 9
  - openshift_container_platform 4
published: '2026-10-18'
updated: '2026-10-23'
sourceUpdated: '2026-10-23T11:16:50+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98786.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98786.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-98786'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2555192'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-98786'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98786'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98786.mbox
  - url: 'https://git.kernel.org/stable/c/daa0437fe5e451856aaf8fda602a9fc2105bbd54'
  - url: 'https://git.kernel.org/stable/c/217f64f348c90cba62164e7ff38e0ccf78a5ca09'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00155
epssPercentile: 0.04619
ingestedAt: '2026-10-18T16:47:32.487Z'
---

## Overview

A flaw was found in the Linux kernel's AMD GPU display driver. During DisplayPort Multi-Stream Transport (MST) display disconnection, a race condition can cause the driver to access display data structures without verifying that they remain valid. A local user or physically proximate attacker triggering display mode checks while unplugging an MST display can cause a null pointer dereference, leading to a system crash and a Denial of Service (DoS).

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, … · updated 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98786.json)

**kernel: drm/amd/display: guard dc_sink dereferences in MST mode validation** — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-23.

Affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

No fix planned:

- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

Not affected:

- Red Hat Enterprise Linux 7
- Red Hat OpenShift Container Platform 4

## Remediation

Out of support scope