---
id: CVE-2025-38391
title: 'usb: typec: altmodes/displayport: do not index invalid pin_assignments'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  usb: typec: altmodes/displayport: do not index invalid pin_assignments

  A poorly implemented DisplayPort Alt Mode port partner can indicate
  that its pin assignment capa…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 <
    c93bc959788ed9a1af7df57cb539837bdf790cee
  - >-
    Linux >= 0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 <
    114a977e0f6bf278e05eade055e13fc271f69cf7
  - >-
    Linux >= 0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 <
    621d5a3ef0231ab242f2d31eecec40c38ca609c5
  - >-
    Linux >= 0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 <
    2f535517b5611b7221ed478527e4b58e29536ddf
  - >-
    Linux >= 0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 <
    45e9444b3b97eaf51a5024f1fea92f44f39b50c6
  - >-
    Linux >= 0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 <
    5581e694d3a1c2f32c5a51d745c55b107644e1f8
  - >-
    Linux >= 0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 <
    47cb5d26f61d80c805d7de4106451153779297a1
  - >-
    Linux >= 0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 <
    af4db5a35a4ef7a68046883bfd12468007db38f1
  - Linux 4.19
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-05T20:55:55.581693Z'
published: '2025-07-25'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T21:02:36.304Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2025-38391'
references:
  - url: 'https://git.kernel.org/stable/c/c93bc959788ed9a1af7df57cb539837bdf790cee'
  - url: 'https://git.kernel.org/stable/c/114a977e0f6bf278e05eade055e13fc271f69cf7'
  - url: 'https://git.kernel.org/stable/c/621d5a3ef0231ab242f2d31eecec40c38ca609c5'
  - url: 'https://git.kernel.org/stable/c/2f535517b5611b7221ed478527e4b58e29536ddf'
  - url: 'https://git.kernel.org/stable/c/45e9444b3b97eaf51a5024f1fea92f44f39b50c6'
  - url: 'https://git.kernel.org/stable/c/5581e694d3a1c2f32c5a51d745c55b107644e1f8'
  - url: 'https://git.kernel.org/stable/c/47cb5d26f61d80c805d7de4106451153779297a1'
  - url: 'https://git.kernel.org/stable/c/af4db5a35a4ef7a68046883bfd12468007db38f1'
tags:
  - cve.org
epss: 0.00208
epssPercentile: 0.11012
ingestedAt: '2026-11-05T22:38:31.966Z'
---

## Overview

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

usb: typec: altmodes/displayport: do not index invalid pin_assignments

A poorly implemented DisplayPort Alt Mode port partner can indicate
that its pin assignment capabilities are greater than the maximum
value, DP_PIN_ASSIGN_F. In this case, calls to pin_assignment_show
will cause a BRK exception due to an out of bounds array access.

Prevent for loop in pin_assignment_show from accessing
invalid values in pin_assignments by adding DP_PIN_ASSIGN_MAX
value in typec_dp.h and using i < DP_PIN_ASSIGN_MAX as a loop
condition.

## Affected

- `Linux >= 0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 < c93bc959788ed9a1af7df57cb539837bdf790cee`
- `Linux >= 0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 < 114a977e0f6bf278e05eade055e13fc271f69cf7`
- `Linux >= 0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 < 621d5a3ef0231ab242f2d31eecec40c38ca609c5`
- `Linux >= 0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 < 2f535517b5611b7221ed478527e4b58e29536ddf`
- `Linux >= 0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 < 45e9444b3b97eaf51a5024f1fea92f44f39b50c6`
- `Linux >= 0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 < 5581e694d3a1c2f32c5a51d745c55b107644e1f8`
- `Linux >= 0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 < 47cb5d26f61d80c805d7de4106451153779297a1`
- `Linux >= 0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 < af4db5a35a4ef7a68046883bfd12468007db38f1`
- `Linux 4.19`

## Remediation

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