CVE-2026-43267
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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.
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Meta Information
Published
2026-05-06
Last Modified
2026-05-08
Generated
2026-06-16
AI Q&A
2026-05-06
EPSS Evaluated
2026-06-14
NVD
CVE-2026-43267
EUVD
EUVD-2026-27664
Affected Vendors & Products
Showing 2 associated CPEs
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
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KEV
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CWE ID Description
CWE-369 The product divides a value by zero.
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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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