---
id: CVE-2026-74585
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  thunderbolt: Bound the DROM dual link port number before indexing sw->ports

  tb_drom_parse_entry_port() validates the device-supplied header->index
  against sw->config.m…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  thunderbolt: Bound the DROM dual link port number before indexing sw->ports

  tb_drom_parse_entry_port() validates the device-supplied header->index
  against sw->config.m…
severity: none
published: '2026-08-22'
updated: '2026-08-22'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-74585'
references:
  - url: 'https://git.kernel.org/stable/c/3d3c212b70633332ab71672aa2bc6af257d2ec83'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/40d2ffb74094cf36edbe05855566a4c58b6ce808'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/50f0c8dd8c3390f851cfb97ca13116f9ee6469d1'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/6c892ed9f4129ae40ef0f92e1bb31aa0b0ddc72c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b98e1e28bd95b0fa33164eec1e763d26c7058b39'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d6764992f17b23d91ff93ce905ab53c2aa7191f0'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f28066057134aa9294caa597b670daf505ad9dce'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f32c3a9a77cfb50934a60b05d5407649af062535'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
ingestedAt: '2026-08-23T06:43:33.517Z'
epss: 0.0022
epssPercentile: 0.11025
---

## Overview

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

thunderbolt: Bound the DROM dual link port number before indexing sw->ports

tb_drom_parse_entry_port() validates the device-supplied header->index
against sw->config.max_port_number before indexing sw->ports[], but the
sibling field entry->dual_link_port_nr -- a 6-bit value also read from
the DROM -- indexes the same array with no such check. A malicious or
malformed Thunderbolt device can set dual_link_port_nr beyond the
allocated sw->ports[] (max_port_number + 1 entries), producing an
out-of-bounds tb_port pointer that is stored and later dereferenced.

Reject a port entry whose dual_link_port_nr exceeds max_port_number,
the same bound already applied to header->index.

## Remediation

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