CVE-2026-63832 wifi: mt76: add wcid publish check in mt76_sta_add

High 8.8 Published 19 Jul 2026 Updated 21 Oct 2026

A race condition in the mt76 WiFi driver causes list corruption and kernel crashes when adding stations, leading to denial of service.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: Not needed
Fix: Available

What is CVE-2026-63832?

CVE-2026-63832 is a high-severity vulnerability in Linux kernel, published on 19 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In the Linux kernel, the following vulnerability has been resolved:

wifi: mt76: add wcid publish check in mt76_sta_add

Since mt7925_mac_sta_add publishes wcid, add publish check in mt76_sta_add to avoid reinitializing the wcid->poll_list.

Found dev->sta_poll_list corruption when using mt7925 and 7.1-rc4. According to the corruption information, prev->next was changed to itself.

wlan0: disconnect from AP 90:fb:5d:94:8b:e3 for new auth to 90:fb:5d:94:8b:e2 wlan0: authenticate with 90:fb:5d:94:8b:e2 (local address=84:9e:56:9c:7e:6b) wlan0: send auth to 90:fb:5d:94:8b:e2 (try 1/3) slab kmalloc-8k start ffff8c80958a6000 pointer offset 4160 size 8192 list_add corruption. prev->next should be next (ffff8c808a7488f8), but was ffff8c80958a7040. (prev=ffff8c80958a7040).

mt76_wcid_add_poll+0x95/0xd0 [mt76] mt7925_mac_add_txs.part.0+0xa5/0xe0 [mt7925_common] mt7925_rx_check+0xa7/0xc0 [mt7925_common] mt76_dma_rx_poll+0x50d/0x790 [mt76] mt792x_poll_rx+0x52/0xe0 [mt792x_lib]

Weakness: CWE-667, CWE-662

Which versions are affected by CVE-2026-63832?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-63832?

Apply the vendor's patch.

Is CVE-2026-63832 being exploited?

There is no known exploitation of CVE-2026-63832 in the wild and no public exploit code.

All Linux kernel vulnerabilities

Sources

Also known as BELL-CVE-2026-63832, DEBIAN-CVE-2026-63832, GHSA-xq4q-93xc-52g2, ROOT-OS-DEBIAN-13-CVE-2026-63832, ROOT-OS-UBUNTU-2204-CVE-2026-63832, UBUNTU-CVE-2026-63832.