CVE-2026-99060wifi: mt76: mt7603: initialize global station WCID

Official description

In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: mt7603: initialize global station WCID mt7603 uses a driver-private global station WCID for frames that have neither a station nor a vif, including frames injected through a monitor interface. Unlike the core global WCID initialized by mt76_register_device(), this WCID is published without ever being passed to mt76_wcid_init(). Since commit 0335c034e726 ("wifi: mt76: fix race condition related to checking tx queue fill status"), mt76_tx() queues every such frame on the WCID's tx_pending or tx_offchannel queue and links its tx_list. The first injected frame therefore reaches __skb_queue_tail() with an uninitialized sk_buff_head and dereferences a NULL prev pointer. Initialize the WCID before publishing it. The fix was tested on an MT7603 PCIe device. Three wildcard probe requests were injected through a monitor interface. The hardware queue head and tail advanced from 0 to 3 and a second radio captured the third request over the air. No oops or reset occurred. After restoring AP mode, a 150 MB transfer also completed without a reset.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/99b8bd6323e6fc69615af828522878b7acb77bff
• https://git.kernel.org/stable/c/e454ec553996f21085657c96c8a605e2d89a81a6
• https://git.kernel.org/stable/c/dd117d17e8aa2e89f857fb708e5b770709fb81cb
• https://git.kernel.org/stable/c/19d6fa087dcf242223645828b8282d4040bad168
• https://git.kernel.org/stable/c/456de496b53ae73e6e3020fec815dbdc88aa7c07