Preface: The vulnerability’s entry point: The memory corruption in the Qualcomm driver is not caused by parsing Radiotap, but rather by the driver parsing invalid HT40 channel layout elements (HT Capabilities / HT Operation IEs) carried in 802.11 management frames (such as Beacon, Probe Response, or Channel Switch Announcement) sent from the remote base station (AP).

Background: The qcacld (Qualcomm Atheros Closed Source / Prima WLAN Driver) is exactly the WLAN host driver for Qualcomm-based wireless chips. It runs on the main operating system and manages the Wi-Fi hardware, translating between the OS network stack and the firmware on the wireless module.

The qcacld (specifically qcacld-2.0 or qcacld-3.0) codebase handles everything related to wireless connections, including supplicant communication, 802.11 association, and radio management. It works alongside the chip-specific firmware (e.g., WCNSS) and hardware configuration files (like qca_cld/WCNSS_qcom_cfg[.]ini) to ensure proper Wi-Fi and Bluetooth coexistence.

Vulnerability details: CVE-2026-25268 is a memory corruption vulnerability (stack-based buffer overflow) affecting WLAN host drivers. It is triggered during dynamic channel switching operations when the system improperly processes invalid HT40 (High Throughput 40MHz) channel layouts.

Core Technical Details

• CWE Identifier: CWE-119 (Memory Corruption / Buffer Overflow)
• CVSS Severity: High (8.8)
• Vector: Local network
• Impact: Allows for the corruption of memory, which can lead to application crashes, system instability, or potential arbitrary code execution.

Affected Systems

This flaw specifically impacts Wi-Fi/WLAN host driver components and has been documented in major hardware vendors such as Qualcomm.

Mitigation

Because this flaw is usually tied to vendor-specific firmware or driver code, the primary path to remediation involves patching your wireless infrastructure or devices.

1. Apply Manufacturer Updates: Monitor your vendor’s security bulletins for firmware upgrades that address this issue.
2. Consult Vendor Advisories: Review the relevant official updates, such as the Qualcomm Security Bulletin, to identify the specific patched driver versions for your affected hardware.
3. Network Isolation: Until patches can be deployed, consider isolating potentially vulnerable wireless devices from critical network segments to limit your attack surface.

Official announcement: Please refer to the link for details – https://docs.qualcomm.com/product/publicresources/securitybulletin/july-2026-bulletin.html