In the Linux kernel, the following vulnerability has been resolved:
wifi: ath11k: use work queue to process beacon tx event
Commit 3a415daa3e8b ("wifi: ath11k: add P2P IE in beacon template") from Feb 28, 2024 (linux-next), leads to the following Smatch static checker warning:
drivers/net/wireless/ath/ath11k/wmi.c:1742 ath11k_wmi_p2p_go_bcn_ie() warn: sleeping in atomic context
The reason is that ath11k_bcn_tx_status_event() will directly call might sleep function ath11k_wmi_cmd_send() during RCU read-side critical sections. The call trace is like:
ath11k_bcn_tx_status_event() -> rcu_read_lock() -> ath11k_mac_bcn_tx_event() -> ath11k_mac_setup_bcn_tmpl() …… -> ath11k_wmi_bcn_tmpl() -> ath11k_wmi_cmd_send() -> rcu_read_unlock()
Commit 886433a98425 ("ath11k: add support for BSS color change") added the ath11k_mac_bcn_tx_event(), commit 01e782c89108 ("ath11k: fix warning of RCU usage for ath11k_mac_get_arvif_by_vdev_id()") added the RCU lock to avoid warning but also introduced this BUG.
Use work queue to avoid directly calling ath11k_mac_bcn_tx_event() during RCU critical sections. No need to worry about the deletion of vif because cancel_work_sync() will drop the work if it doesn't start or block vif deletion until the running work is done.
Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.30
CVSS Details
- CVSS 3.1 Base Score: 8.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 27, 2026 | Jul 27, 2026 |
| Ubuntu | — | Upgrade linux-image-virtual-hwe-24.04Upgrade linux-image-6.11.0-1009-gcpUpgrade linux-image-6.11.0-1009-azureUpgrade linux-image-oem-24.04bUpgrade linux-image-oracle-64kUpgrade linux-image-genericUpgrade linux-image-6.11.0-1009-azure-fdeUpgrade linux-image-6.11.0-1011-oracle-64kUpgrade linux-image-azure-fdeUpgrade linux-image-lowlatencyUpgrade linux-image-6.11.0-1011-oracleUpgrade linux-image-oracleUpgrade linux-image-lowlatency-64kUpgrade linux-image-gcpUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-6.11.0-1005-realtimeUpgrade linux-image-generic-64kUpgrade linux-image-virtualUpgrade linux-image-oem-24.04aUpgrade linux-image-6.11.0-1009-awsUpgrade linux-image-6.11.0-1015-oemUpgrade linux-image-realtime-hwe-24.04Upgrade linux-image-oem-24.04Upgrade linux-image-raspiUpgrade linux-image-azureUpgrade linux-image-6.11.0-1010-lowlatency-64kUpgrade linux-image-6.11.0-18-genericUpgrade linux-image-6.11.0-1008-raspiUpgrade linux-image-6.11.0-18-generic-64kUpgrade linux-image-awsUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-realtimeUpgrade linux-image-6.11.0-1010-lowlatency | Feb 20, 2025 | Oct 21, 2024 |
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