CVE-2026-72003

Technical Description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References