CVE-2023-54300

/// Technical description

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

wifi: ath9k: avoid referencing uninit memory in ath9k_wmi_ctrl_rx

For the reasons also described in commit b383e8abed41 ("wifi: ath9k: avoid

uninit memory read in ath9k_htc_rx_msg()"), ath9k_htc_rx_msg() should

validate pkt_len before accessing the SKB.

For example, the obtained SKB may have been badly constructed with

pkt_len = 8. In this case, the SKB can only contain a valid htc_frame_hdr

but after being processed in ath9k_htc_rx_msg() and passed to

ath9k_wmi_ctrl_rx() endpoint RX handler, it is expected to have a WMI

command header which should be located inside its data payload.

Implement sanity checking inside ath9k_wmi_ctrl_rx(). Otherwise, uninit

memory can be referenced.

Tested on Qualcomm Atheros Communications AR9271 802.11n .

Found by Linux Verification Center (linuxtesting.org) with Syzkaller.

/// 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