Bug 2516912 (CVE-2026-74367)

Summary: CVE-2026-74367 kernel: wifi: ath12k: fix inconsistent arvif state in vdev_create error paths
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: low    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the `ath12k` Wi-Fi driver of the Linux kernel. This vulnerability arises from inconsistent internal state management during error conditions in virtual device creation. If an error occurs, the driver may not properly clear its internal state, leading to resource issues. This could potentially allow a local attacker to cause system instability or a denial of service.
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Description OSIDB Bzimport 2026-08-15 06:40:02 UTC 
In the Linux kernel, the following vulnerability has been resolved:

wifi: ath12k: fix inconsistent arvif state in vdev_create error paths

ath12k_mac_vdev_create() has three error path issues that leave arvif
in an inconsistent state:

1. When ath12k_wmi_vdev_create() fails, the function returns directly
   without clearing arvif->ar, which was already set before the WMI
   call. Subsequent code checking arvif->ar to determine vdev readiness
   will see a non-NULL value despite no vdev existing in firmware.

2. When ath12k_wmi_send_peer_delete_cmd() fails in err_peer_del, the
   code jumped to err: skipping the DP peer cleanup and vdev rollback,
   leaving num_created_vdevs, vdev maps and arvif list membership live.

3. When ath12k_wait_for_peer_delete_done() fails, the code jumped to
   err_vdev_del: skipping the DP peer cleanup.

Fix by changing the ath12k_wmi_vdev_create() failure to goto err instead
of returning directly, routing both err_peer_del failure paths through
err_dp_peer_del: for proper DP peer and vdev rollback, and consolidating
the arvif state cleanup at err:.

Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.1.c5-00302-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1.115823.3
Comment 1 Keith Grant 2026-08-20 19:20:04 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081502-CVE-2026-74367-6464@gregkh/T