---
id: CVE-2026-53135
title: 'drm/amd/display: Fix NULL deref and buffer over-read in SDP debugfs'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  drm/amd/display: Fix NULL deref and buffer over-read in SDP debugfs

  [Why & How]
  dp_sdp_message_debugfs_write() dereferences connector->base.state->crtc
  without checkin…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= c7ba3653e9773256b2b08508a2ed2ca28ea7566b <
    ee9cfcf77a8e8af637396dc00966df5f701e661c
  - >-
    Linux >= c7ba3653e9773256b2b08508a2ed2ca28ea7566b <
    b781f90a9528555c709e59789550893581ef0be4
  - >-
    Linux >= c7ba3653e9773256b2b08508a2ed2ca28ea7566b <
    a2de1d71891a038a9346b2c1a72b88c8350f2479
  - >-
    Linux >= c7ba3653e9773256b2b08508a2ed2ca28ea7566b <
    7fc4fab4acc307ad2903312c195872b2953d32c3
  - >-
    Linux >= c7ba3653e9773256b2b08508a2ed2ca28ea7566b <
    7ae95c0275c330b5dbae806f8e431720edad776f
  - >-
    Linux >= c7ba3653e9773256b2b08508a2ed2ca28ea7566b <
    bb6f705b73b5f191f14ad004e2c8c4b615806187
  - >-
    Linux >= c7ba3653e9773256b2b08508a2ed2ca28ea7566b <
    c90954cdea4d6998ec345de0d840d030c145b89e
  - >-
    Linux >= c7ba3653e9773256b2b08508a2ed2ca28ea7566b <
    adf67034b1f61f7119295208085bfd43f85f56af
  - Linux 5.2
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-06T16:20:23.594173Z'
published: '2026-06-25'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T16:24:03.663Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-53135'
references:
  - url: 'https://git.kernel.org/stable/c/ee9cfcf77a8e8af637396dc00966df5f701e661c'
  - url: 'https://git.kernel.org/stable/c/b781f90a9528555c709e59789550893581ef0be4'
  - url: 'https://git.kernel.org/stable/c/a2de1d71891a038a9346b2c1a72b88c8350f2479'
  - url: 'https://git.kernel.org/stable/c/7fc4fab4acc307ad2903312c195872b2953d32c3'
  - url: 'https://git.kernel.org/stable/c/7ae95c0275c330b5dbae806f8e431720edad776f'
  - url: 'https://git.kernel.org/stable/c/bb6f705b73b5f191f14ad004e2c8c4b615806187'
  - url: 'https://git.kernel.org/stable/c/c90954cdea4d6998ec345de0d840d030c145b89e'
  - url: 'https://git.kernel.org/stable/c/adf67034b1f61f7119295208085bfd43f85f56af'
tags:
  - cve.org
epss: 0.00123
epssPercentile: 0.02059
ingestedAt: '2026-11-06T16:57:43.282Z'
---

## Overview

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

drm/amd/display: Fix NULL deref and buffer over-read in SDP debugfs

[Why & How]
dp_sdp_message_debugfs_write() dereferences connector->base.state->crtc
without checking for NULL. A connector can be connected but not bound to
any CRTC (e.g. after hot-plug before the next atomic commit), causing a
kernel crash when writing to the sdp_message debugfs node.

The function also ignores the user-provided size argument and always
passes 36 bytes to copy_from_user(), reading past the user buffer when
size < 36.

Fix both issues by:
- Returning -ENODEV when connector->base.state or state->crtc is NULL
- Clamping write_size to min(size, sizeof(data))

(cherry picked from commit 6ab4c36a522842ff70474a1c0af2e40e50fc8300)

## Affected

- `Linux >= c7ba3653e9773256b2b08508a2ed2ca28ea7566b < ee9cfcf77a8e8af637396dc00966df5f701e661c`
- `Linux >= c7ba3653e9773256b2b08508a2ed2ca28ea7566b < b781f90a9528555c709e59789550893581ef0be4`
- `Linux >= c7ba3653e9773256b2b08508a2ed2ca28ea7566b < a2de1d71891a038a9346b2c1a72b88c8350f2479`
- `Linux >= c7ba3653e9773256b2b08508a2ed2ca28ea7566b < 7fc4fab4acc307ad2903312c195872b2953d32c3`
- `Linux >= c7ba3653e9773256b2b08508a2ed2ca28ea7566b < 7ae95c0275c330b5dbae806f8e431720edad776f`
- `Linux >= c7ba3653e9773256b2b08508a2ed2ca28ea7566b < bb6f705b73b5f191f14ad004e2c8c4b615806187`
- `Linux >= c7ba3653e9773256b2b08508a2ed2ca28ea7566b < c90954cdea4d6998ec345de0d840d030c145b89e`
- `Linux >= c7ba3653e9773256b2b08508a2ed2ca28ea7566b < adf67034b1f61f7119295208085bfd43f85f56af`
- `Linux 5.2`

## Remediation

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