---
id: CVE-2026-90289
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  drm/amd/display: Resize MST HDCP per-connector arrays to 32

  AMDGPU_DM_MAX_DISPLAY_INDEX is 31
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  drm/amd/display: Resize MST HDCP per-connector arrays to 32

  AMDGPU_DM_MAX_DISPLAY_INDEX is 31. It suggest a maximum number of
  32 connectors. But the way it's used is l…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 82986fd631fa04bcedaefe11a6b3767601cbe84f <
    0fa116a17b69a28712cdf209318e345b676d7f6c
  - >-
    Linux >= 82986fd631fa04bcedaefe11a6b3767601cbe84f <
    261e0fe4e2c99f687114b64b10b98db964b475f4
  - Linux 99c444d3c3c43db354b253d9bfac081073dcb484
  - Linux d90f97cb3821c47bdf773dcf6cade143773ec764
  - Linux >= 5.15.128 < 5.16
  - Linux >= 6.1.47 < 6.2
  - Linux 6.3
published: '2026-09-17'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T18:17:51.880'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90289'
references:
  - url: 'https://git.kernel.org/stable/c/0fa116a17b69a28712cdf209318e345b676d7f6c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/261e0fe4e2c99f687114b64b10b98db964b475f4'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
epss: 0.00165
epssPercentile: 0.0504
ingestedAt: '2026-09-17T16:21:47.833Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

drm/amd/display: Resize MST HDCP per-connector arrays to 32

AMDGPU_DM_MAX_DISPLAY_INDEX is 31. It suggest a maximum number of
32 connectors. But the way it's used is like MAX_DISPLAY_COUNT.
Hence we're off by one with DRM core, which supports a max of 32
connectors.

Rename AMDGPU_DM_MAX_DISPLAY_INDEX to AMDGPU_DM_MAX_DISPLAY_COUNT
to match its actual use, and increase the size to 32 to match the
originally intended size.

## Remediation

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