CVE-2026-72003

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

wifi: brcmfmac: cyw: fix heap overflow on a short auth frame

brcmf_notify_auth_frame_rx() takes the frame length from the firmware

event and copies the frame body with the management header offset

subtracted:

u32 mgmt_frame_len = e->datalen - sizeof(struct brcmf_rx_mgmt_data);

...

memcpy(&mgmt_frame->u, frame,

mgmt_frame_len - offsetof(struct ieee80211_mgmt, u));

The only length check is e->datalen >= sizeof(*rxframe), so mgmt_frame_len

can be anything from 0 up. offsetof(struct ieee80211_mgmt, u) is 24. When

mgmt_frame_len is below that, the subtraction wraps as an unsigned value to

a huge length. The memcpy then runs far past the kzalloc'd buffer. A

malicious or malfunctioning AP can make the frame short during the

external SAE auth exchange, so this is a remotely triggered heap overflow.

Reject frames shorter than the management header offset before the copy.