---
id: CVE-2026-80943
title: >-
  kernel: wifi: rtlwifi: rtl8192du: check QoS TID before indexing tids
  (CVE-2026-80943)
summary: >-
  A flaw was found in the Linux kernel's rtlwifi driver. This vulnerability
  occurs when the `rtl92du_tx_fill_desc()` function uses a Quality of Service
  (QoS) Traffic Identifier (TID) value greater than 8 as an index into an array
  that only h…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe: CWE-787
vendor: Red Hat
product: Linux
affected:
  - >-
    Linux >= 8321424134a400a5e3eb39f9acca6bc6946ff447 <
    6e327f14e1c43e175bf530f9165b2cadff308553
  - >-
    Linux >= 8321424134a400a5e3eb39f9acca6bc6946ff447 <
    0c0b374e12d52af23ca741728db31091677cf9dc
  - >-
    Linux >= 8321424134a400a5e3eb39f9acca6bc6946ff447 <
    42785f7e8d31540e6172bbcf08a7cc3cae1086f8
  - >-
    Linux >= 8321424134a400a5e3eb39f9acca6bc6946ff447 <
    ed4f05d9f2f42fd866f55108db8123eefcc5fb33
  - Linux 6.11
published: '2026-09-11'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T15:54:38+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80943.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80943.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-80943'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532256'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-80943'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-80943'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80943.mbox
  - url: 'https://git.kernel.org/stable/c/6e327f14e1c43e175bf530f9165b2cadff308553'
  - url: 'https://git.kernel.org/stable/c/0c0b374e12d52af23ca741728db31091677cf9dc'
  - url: 'https://git.kernel.org/stable/c/42785f7e8d31540e6172bbcf08a7cc3cae1086f8'
  - url: 'https://git.kernel.org/stable/c/ed4f05d9f2f42fd866f55108db8123eefcc5fb33'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.00247
epssPercentile: 0.1628
scores:
  vendor: 5.5
  cna: 7.6
ingestedAt: '2026-09-14T15:23:07.476Z'
---

## Overview

A flaw was found in the Linux kernel's rtlwifi driver. This vulnerability occurs when the `rtl92du_tx_fill_desc()` function uses a Quality of Service (QoS) Traffic Identifier (TID) value greater than 8 as an index into an array that only has 9 allocated entries. A remote attacker could potentially exploit this out-of-bounds array access, leading to memory corruption and potentially a denial of service.

## Vendor advisories

- **Red Hat VEX** · Moderate · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80943.json)

**kernel: wifi: rtlwifi: rtl8192du: check QoS TID before indexing tids** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-14.

Not affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

## Remediation

Refer to the advisory for fix availability.