CVE-2023-53199

/// Technical description

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

wifi: ath9k: hif_usb: clean up skbs if ath9k_hif_usb_rx_stream() fails

Syzkaller detected a memory leak of skbs in ath9k_hif_usb_rx_stream().

While processing skbs in ath9k_hif_usb_rx_stream(), the already allocated

skbs in skb_pool are not freed if ath9k_hif_usb_rx_stream() fails. If we

have an incorrect pkt_len or pkt_tag, the input skb is considered invalid

and dropped. All the associated packets already in skb_pool should be

dropped and freed. Added a comment describing this issue.

The patch also makes remain_skb NULL after being processed so that it

cannot be referenced after potential free. The initialization of hif_dev

fields which are associated with remain_skb (rx_remain_len,

rx_transfer_len and rx_pad_len) is moved after a new remain_skb is

allocated.

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