CVE-2026-46136
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Buffer Length Underflow in Linux Kernel mt76 WiFi Driver

Publication date: 2026-05-28

Last updated on: 2026-06-01

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: mt7921: fix a potential clc buffer length underflow The buf_len is used to limit the iterations for retrieving the country power setting and may underflow under certain conditions due to changes in the power table in CLC. This underflow leads to an almost infinite loop or an invalid power setting resulting in driver initialization failure.
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Meta Information
Published
2026-05-28
Last Modified
2026-06-01
Generated
2026-06-17
AI Q&A
2026-05-28
EPSS Evaluated
2026-06-16
NVD
CVE-2026-46136
EUVD
EUVD-2026-32763
Affected Vendors & Products
Showing 3 associated CPEs
Vendor Product Version / Range
linux linux_kernel *
linux_kernel linux_kernel *
linux_kernel mt76 *
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability exists in the Linux kernel's wifi driver for the mt76 chipset, specifically the mt7921 model. It involves a potential buffer length underflow in the country power setting retrieval process. The buffer length (buf_len) is used to limit iterations when retrieving power settings, but under certain conditions related to changes in the power table in CLC, this length can underflow.

This underflow can cause an almost infinite loop or result in an invalid power setting, which leads to failure during the driver initialization.

Impact Analysis

The impact of this vulnerability is that the wifi driver for the mt7921 chipset may fail to initialize properly due to an infinite loop or invalid power settings caused by the buffer length underflow.

This could result in loss of wifi functionality or instability in systems using this driver, potentially affecting connectivity and network-dependent operations.

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