Null Pointer Dereference in Linux Kernel mt76 WiFi Driver

Executive Summary

This is a NULL pointer dereference vulnerability in the Linux kernel's mt76 Wi-Fi driver, specifically in the mt7996 chipset. The function mt76_connac_get_he_phy_cap() may return NULL, and the code attempts to use this pointer without checking if it is valid first. This could lead to a system crash or other unexpected behavior if exploited.

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Detection Guidance

This vulnerability is specific to the Linux kernel's mt76 driver for MediaTek MT7996 WiFi chips. Detection requires checking kernel logs for NULL pointer dereference errors in the mt76_connac_get_he_phy_cap function. Use commands like dmesg | grep mt76 or journalctl -k | grep mt76 to search for related errors.

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Impact Analysis

If exploited, this vulnerability could cause a kernel panic or system crash, leading to denial of service. An attacker within Wi-Fi range could potentially trigger this issue to disrupt network connectivity or crash affected devices running vulnerable Linux kernel versions.

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Compliance Impact

This vulnerability does not directly affect compliance with standards like GDPR or HIPAA as it is a low-level kernel issue in the WiFi driver. It may indirectly impact compliance if exploited to cause system instability or unauthorized access, but no evidence suggests direct regulatory impact.

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Mitigation Strategies

Update your Linux kernel to the latest stable version that includes the fix for this CVE. If immediate patching is not possible, consider disabling the affected mt76 WiFi driver module temporarily until an update is applied.

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