CVE-2026-68311
Received Received - Intake

Null Pointer Dereference in Linux Kernel WiFi Driver

Publication date: 2026-08-10

Last updated on: 2026-08-10

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: mt7925: guard link STA in decap offload mt7925_sta_set_decap_offload() iterates over the vif valid_links mask when updating decap offload state for an MLO station. The station may not have a link STA for every valid link of the vif, so mt792x_sta_to_link() can return NULL for a link that belongs to the vif but not to the station. The function currently dereferences mlink before checking whether the link WCID is ready. If mlink is NULL, setting or clearing MT_WCID_FLAG_HDR_TRANS dereferences a NULL pointer. Skip links without a station link before touching mlink->wcid.

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Meta Information

Published
2026-08-10
Last Modified
2026-08-10
Generated
2026-08-10
AI Q&A
2026-08-10
EPSS Evaluated
N/A
NVD
CVE-2026-68311
EUVD
EUVD-2026-55412

Affected Vendors & Products

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

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability in the Linux kernel affects the mt76 driver for MediaTek MT7925 Wi-Fi devices. It involves a NULL pointer dereference in the function mt7925_sta_set_decap_offload() when handling multi-link operation (MLO) stations. The issue occurs because the function does not properly check if a link station exists before accessing its data, leading to a crash if a link without a station is processed.

Detection Guidance

This vulnerability affects the Linux kernel's mt76 driver for MT7925 WiFi devices. Detection requires checking kernel logs for NULL pointer dereference errors in the mt7925_sta_set_decap_offload function. Monitor logs with dmesg or journalctl for crashes or warnings related to the mt76 driver.

Impact Analysis

If exploited, this vulnerability could cause a kernel crash or denial of service on affected systems using the mt76 driver with MT7925 Wi-Fi hardware. This may result in system instability, loss of network connectivity, or potential unauthorized access if the system is part of a larger network.

Mitigation Strategies

Apply the latest kernel update that includes the fix for CVE-2026-68311. If immediate patching is not possible, disable the affected mt76 driver or restrict WiFi functionality until the update is applied to prevent potential crashes or security issues.

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