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.
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Sep 17, 2025 | Sep 17, 2025 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Sep 15, 2025 |
| Ubuntu | — | Upgrade linux-gkeUpgrade linux-aws-5.4Upgrade linux-azure-fipsUpgrade linux-gcp-5.15Upgrade linux-realtimeUpgrade linux-oracle-5.4Upgrade linux-intel-iotg-5.15Upgrade linux-aws-5.15Upgrade linux-lowlatency-hwe-5.15Upgrade linux-raspiUpgrade linux-hwe-5.15Upgrade linux-azure-5.4Upgrade linuxUpgrade linux-gkeopUpgrade linux-lowlatencyUpgrade linux-iotUpgrade linux-kvmUpgrade linux-oracle-5.15Upgrade linux-azureUpgrade linux-intel-iot-realtimeUpgrade linux-riscv-5.15Upgrade linux-gcpUpgrade linux-hwe-5.4Upgrade linux-ibm-5.4Upgrade linux-gcp-fipsUpgrade linux-bluefieldUpgrade linux-nvidia-tegraUpgrade linux-nvidiaUpgrade linux-ibmUpgrade linux-intel-iotgUpgrade linux-fipsUpgrade linux-oracleUpgrade linux-gcp-5.4Upgrade linux-awsUpgrade linux-raspi-5.4Upgrade linux-xilinx-zynqmpUpgrade linux-azure-5.15Upgrade linux-aws-fipsUpgrade linux-nvidia-tegra-5.15 | Sep 19, 2025 | Sep 16, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 15, 2025 | Sep 15, 2025 |
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