Division by Zero in Linux Kernel WiFi Driver

Publication date: 2026-05-06

Last updated on: 2026-05-08

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: wifi: rtw89: fix potential zero beacon interval in beacon tracking During fuzz testing, it was discovered that bss_conf->beacon_int might be zero, which could result in a division by zero error in subsequent calculations. Set a default value of 100 TU if the interval is zero to ensure stability.

CVSS Scores

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Meta Information

Published

2026-05-06

Last Modified

2026-05-08

Generated

2026-07-06

AI Q&A

2026-05-06

EPSS Evaluated

2026-07-05

NVD

CVE-2026-43267

EUVD

EUVD-2026-27664

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	From 6.19 (inc) to 6.19.6 (exc)
linux	linux_kernel	From 6.18 (inc) to 6.18.16 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-369	The product divides a value by zero.

Attack-Flow Graph

Impact Analysis

If the beacon interval is zero, it could cause a division by zero error in the wifi driver, which may lead to system instability or crashes. This could disrupt wireless network functionality on affected Linux systems, potentially causing loss of connectivity or degraded performance.

Executive Summary

This vulnerability exists in the Linux kernel's wifi driver rtw89. During fuzz testing, it was found that the beacon interval value (bss_conf->beacon_int) could be zero. Since this value is used in calculations, a zero value could cause a division by zero error, potentially leading to instability or crashes. The fix sets a default beacon interval value of 100 TU (time units) if the interval is zero to prevent this issue.

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