CVE-2026-74322
Received Received - Intake

NULL Pointer Dereference in MediaTek mt76 WiFi Driver

Publication date: 2026-08-15

Last updated on: 2026-08-15

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: mt7996: Fix possible NULL pointer dereference in mt7996_mac_write_txwi_80211() For injected frames (e.g. via radiotap), mac80211 can pass info->control.vif = NULL, as explicitly noted in struct ieee80211_tx_info. Check vif pointer before executing ieee80211_vif_is_mld() in mt7996_mac_write_txwi_80211 routine in order to avoid a possible NULL pointer dereference.

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Meta Information

Published
2026-08-15
Last Modified
2026-08-15
Generated
2026-08-15
AI Q&A
2026-08-15
EPSS Evaluated
N/A
NVD
CVE-2026-74322
EUVD
EUVD-2026-59469

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This is a NULL pointer dereference vulnerability in the Linux kernel's mt76 WiFi driver, specifically in the mt7996 chipset. When processing injected frames via radiotap, mac80211 may pass a NULL vif pointer. The function mt7996_mac_write_txwi_80211 attempts to use this NULL pointer without checking, leading to a potential crash.

Detection Guidance

This vulnerability involves a NULL pointer dereference in the Linux kernel's mt76 driver for MediaTek MT7996 WiFi chips. Detection requires checking kernel logs for crashes or errors related to mt7996_mac_write_txwi_80211. Monitor system logs with commands like dmesg | grep mt7996 or journalctl -k | grep mt7996. If you see NULL pointer dereference errors, the vulnerability may be triggered.

Impact Analysis

This vulnerability could cause a system crash or kernel panic if exploited, leading to denial of service. It affects systems using the mt7996 WiFi chipset in the Linux kernel. An attacker within WiFi range could trigger this by sending specially crafted frames.

Mitigation Strategies

Immediate mitigation involves updating the Linux kernel to a patched version that includes the fix for this issue. Check your distribution's security updates or kernel patches. If updating is not immediately possible, consider disabling the affected mt76 driver module temporarily or restricting WiFi operations until the patch is applied.

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