---
title: "CVE-2026-80943: Linux Kernel rtlwifi - Out-of-Bounds Read/Write"
description: "Linux kernel wifi rtlwifi rtl8192du contains an out-of-bounds array indexing vulnerability caused by unchecked QoS TID indexing in rtl92du_tx_fill_desc(), letting attackers potentially cause memory corruption or denial of service, exploit requires crafted network packets."
url: https://panop.io/threat-heartbeat/CVE-2026-80943/
---

# CVE-2026-80943 Linux Kernel rtlwifi - Out-of-Bounds Read/Write

Linux kernel wifi rtlwifi rtl8192du contains an out-of-bounds array indexing vulnerability caused by unchecked QoS TID indexing in rtl92du\_tx\_fill\_desc(), letting attackers potentially cause memory corruption or denial of service, exploit requires crafted network packets.

CVSS base score 7.6 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.24% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-80943)

## Details

Type

Out-of-Bounds Read/Write

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

Published

11 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-80943](https://nvd.nist.gov/vuln/detail/CVE-2026-80943)
- [https://git.kernel.org/stable/c/6e327f14e1c43e175bf530f9165b2cadff308553](https://git.kernel.org/stable/c/6e327f14e1c43e175bf530f9165b2cadff308553)
- [https://git.kernel.org/stable/c/ed4f05d9f2f42fd866f55108db8123eefcc5fb33](https://git.kernel.org/stable/c/ed4f05d9f2f42fd866f55108db8123eefcc5fb33)
- [https://git.kernel.org/stable/c/0c0b374e12d52af23ca741728db31091677cf9dc](https://git.kernel.org/stable/c/0c0b374e12d52af23ca741728db31091677cf9dc)
- [https://git.kernel.org/stable/c/42785f7e8d31540e6172bbcf08a7cc3cae1086f8](https://git.kernel.org/stable/c/42785f7e8d31540e6172bbcf08a7cc3cae1086f8)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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