---
id: CVE-2026-74409
title: 'wifi: rtw89: add bounds check on firmware mac_id in link lookup'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  wifi: rtw89: add bounds check on firmware mac_id in link lookup

  The mac_id field in RX descriptors is 8 bits wide (0-255), but
  assoc_link_on_macid[] has only RTW89_MAX…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 144c6cd24b3556e6e7a14271cee57a42ebf97450 <
    ad445de67359f24088d4305c05fbd7e34c4e35e3
  - >-
    Linux >= 144c6cd24b3556e6e7a14271cee57a42ebf97450 <
    920101305e7601a33b9e01019f4ca526af2526ae
  - >-
    Linux >= 144c6cd24b3556e6e7a14271cee57a42ebf97450 <
    6d88244bb129755acca696f9227200f4a2d106a6
  - Linux 6.14
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T18:55:59.552190Z'
published: '2026-08-15'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T19:05:43.801Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-74409'
references:
  - url: 'https://git.kernel.org/stable/c/ad445de67359f24088d4305c05fbd7e34c4e35e3'
  - url: 'https://git.kernel.org/stable/c/920101305e7601a33b9e01019f4ca526af2526ae'
  - url: 'https://git.kernel.org/stable/c/6d88244bb129755acca696f9227200f4a2d106a6'
tags:
  - cve.org
epss: 0.00375
epssPercentile: 0.29894
ingestedAt: '2026-10-16T19:46:24.365Z'
---

## Overview

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

wifi: rtw89: add bounds check on firmware mac_id in link lookup

The mac_id field in RX descriptors is 8 bits wide (0-255), but
assoc_link_on_macid[] has only RTW89_MAX_MAC_ID_NUM (128) entries.
While the driver currently assigns mac_id values below 128, the
descriptor value comes from firmware and is not validated before use
as an array index. Add a defensive bounds check in
rtw89_assoc_link_rcu_dereference() to guard against out-of-range
firmware values.

## Affected

- `Linux >= 144c6cd24b3556e6e7a14271cee57a42ebf97450 < ad445de67359f24088d4305c05fbd7e34c4e35e3`
- `Linux >= 144c6cd24b3556e6e7a14271cee57a42ebf97450 < 920101305e7601a33b9e01019f4ca526af2526ae`
- `Linux >= 144c6cd24b3556e6e7a14271cee57a42ebf97450 < 6d88244bb129755acca696f9227200f4a2d106a6`
- `Linux 6.14`

## Remediation

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