wifi: wcn36xx Heap Overflow in Firmware HAL Response

Executive Summary

This is a heap buffer overflow vulnerability in the Linux kernel's wifi driver for WCN36xx devices. The issue occurs when the firmware sends an oversized response that exceeds the allocated buffer size of 4096 bytes. The driver copies this response into a fixed-size buffer without checking its length, causing a heap overflow with firmware-controlled data.

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Detection Guidance

This vulnerability involves a heap overflow in the Linux kernel's wcn36xx WiFi driver due to unchecked firmware response sizes. Detection requires checking kernel logs for related errors or crashes, particularly after WiFi operations. Commands like 'dmesg | grep wcn36xx' or 'journalctl -k | grep -i overflow' may reveal issues. Ensure your kernel version is up to date to confirm if the fix is applied.

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Impact Analysis

This vulnerability could allow an attacker within WiFi range to potentially execute arbitrary code or cause a denial of service on affected systems by sending maliciously crafted firmware responses. It may lead to system crashes, privilege escalation, or unauthorized access depending on the kernel's memory layout and protections.

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Compliance Impact

This vulnerability does not directly affect compliance with GDPR, HIPAA, or similar standards as it is a technical flaw in the Linux kernel's wifi driver (wcn36xx) involving a heap overflow from an oversized firmware response. Compliance impacts would depend on system-specific implementations and mitigations rather than the vulnerability itself.

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Mitigation Strategies

Update your Linux kernel to the latest stable version that includes the fix for CVE-2026-74341. If immediate patching is not possible, disable the wcn36xx driver by blacklisting it or restrict WiFi usage until patched. Monitor vendor advisories for kernel updates.

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