---
id: CVE-2026-53136
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  drm/amd/display: Clamp VBIOS HDMI retimer register count to array size

  [Why & How]
  The VBIOS integrated info tables (v1_11 and v2_1) contain HdmiRegNum and
  Hdmi6GRegNu…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  drm/amd/display: Clamp VBIOS HDMI retimer register count to array size

  [Why & How]
  The VBIOS integrated info tables (v1_11 and v2_1) contain HdmiRegNum and
  Hdmi6GRegNu…
severity: none
published: '2026-06-25'
updated: '2026-06-29'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-53136'
references:
  - url: 'https://git.kernel.org/stable/c/029571d51140650783be4fb98fe7cb4754752086'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/3f32d52ec604c659725d865cf8cc6a17a33f9c6a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4d1c3c26c2ab1842e139e61983395d64bd2e518b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5f8b39452fb16f507c9e4d8b4a83ce27e893307c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/8aaa7e317fbd4beb9c6a9f77aa4cf52fae78b117'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d6be8e59af412623e3d874be3a048406c0edfe60'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/fb0707ce00eef4e2d60c3020e1c0432739703e4a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00129
epssPercentile: 0.02945
ingestedAt: '2026-06-29T13:42:11.999Z'
---

## Overview

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

drm/amd/display: Clamp VBIOS HDMI retimer register count to array size

[Why & How]
The VBIOS integrated info tables (v1_11 and v2_1) contain HdmiRegNum and
Hdmi6GRegNum fields that are used as loop bounds when copying retimer I2C
register settings into fixed-size arrays (dp*_ext_hdmi_reg_settings[9]
and dp*_ext_hdmi_6g_reg_settings[3]). These u8 fields are not validated
before use, so a malformed VBIOS can specify values up to 255, causing an
out-of-bounds heap write during driver probe.

Clamp each register count to the destination array size using min_t()
before the copy loops, in both get_integrated_info_v11() and
get_integrated_info_v2_1().

(cherry picked from commit 5a7f0ef90195940c54b0f5bb85b87da55f038c69)

## Remediation

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