CVE-2026-25268: Qualcomm Wireless Memory Corruption – HT40 Channel Switching

Technical summary

CVE-2026-25268 is a stack-based buffer overflow (CWE-121) in Qualcomm wireless drivers and firmware implementations. The vulnerability is triggered when the system attempts to dynamically switch Wi-Fi channels and encounters malformed HT40 channel layout parameters. Insufficient input validation allows an attacker to write beyond allocated memory boundaries during channel negotiation or reconfiguration. The flaw is particularly dangerous because it can affect system stability across process boundaries (CVSS Scope: Changed), meaning compromise of one process can impact the broader system. The attack requires local access and low privileges but carries high impact—code execution at higher privilege levels, data confidentiality breach, and denial of service are all achievable outcomes.

Business impact

Organizations deploying Qualcomm-based wireless infrastructure face potential service disruption and security compromise. Affected devices include enterprise access points, ISP-provided fixed wireless gateways, managed switches, and IoT network appliances. A successful exploit could lead to unauthorized system access, eavesdropping on wireless traffic, or forced device reboot. For managed service providers and carriers, this affects service availability and customer trust. The broad product range suggests this vulnerability may exist in many customer environments undetected until active exploitation occurs.

Affected systems

The vulnerability impacts Qualcomm wireless chipsets across multiple product families: WSA8835 (Audio/wireless SoC), AR8035 (Ethernet PHY), CQ7790 and CQ8725S (IoT/embedded), QCA4024 (automotive Ethernet), QCA6174A (mobile/laptop WLAN), QCA8075/8080/8081/8082/8084/8085 (WiFi 5/6 routers and access points), QCA8101/8102/8111/8112 (edge routing), and QCA8337/8384/8385 (managed switches). Both the firmware and hardware device variants are affected. Any device running vulnerable versions of these components is at risk.

Exploitability

Exploitation requires local access—an attacker must already have a foothold on the target device or adjacent network interface. This restricts the threat model to insider threats, compromised guests on a corporate network, or pre-existing malware. The attack is deterministic once an attacker can trigger channel switching operations or send specially crafted wireless configuration frames. No user interaction is needed; the vulnerability is triggered automatically during legitimate dynamic channel negotiation. Given the prevalence of these chipsets and the straightforward nature of the memory corruption flaw, exploitation tools are likely to emerge once patches are widely available and the specifics become known.

Remediation

Qualcomm has addressed this vulnerability in firmware updates for affected chipsets. Organizations must identify devices containing vulnerable Qualcomm components and apply the latest firmware patches from their respective device manufacturers (router vendors, access point makers, gateway providers, etc.). Firmware updates are the only remediation—there is no workaround. Organizations should prioritize devices handling sensitive data, critical infrastructure access, or production network services.

Patch guidance

Contact your device vendor or manufacturer for firmware updates addressing this vulnerability. Verify the patch details against Qualcomm's security advisories and your device manufacturer's release notes. Firmware updates for these chipsets are typically applied through device management interfaces (web UI, SSH, or vendor-supplied tools). Test updates in a non-production environment first to ensure compatibility with your network configuration. For enterprise deployments, consider phased rollout to minimize operational risk. Check with your vendor on the availability of patches for your specific product and version—not all older devices may receive updates.

Detection guidance

Monitor for unexpected system crashes or reboots associated with wireless operations, particularly during channel switching scenarios. If available, review firmware logs for memory protection violations or buffer overflow detection events. Network intrusion detection systems (IDS) may flag malformed 802.11 channel configuration frames, though this requires signatures tuned to Qualcomm implementations. Endpoint detection and response (EDR) tools can identify privilege escalation attempts or unexpected process behavior following a potential exploitation event. Firmware integrity monitoring tools help detect unauthorized modifications resulting from exploitation.

Why prioritize this

This vulnerability merits high priority because (1) it affects foundational wireless infrastructure used across consumer, enterprise, and critical infrastructure; (2) successful exploitation grants elevated privileges and system compromise; (3) the broad attack surface (channel switching is a normal, frequent operation); (4) affected Qualcomm chipsets are embedded in devices that may not receive regular updates; and (5) local attack requirement, while limiting initial access, is easily met in multi-tenant or compromised-network scenarios.

Risk score, explained

The CVSS 3.1 score of 8.8 (HIGH) reflects the combination of high confidentiality, integrity, and availability impact coupled with the scope change (privilege boundary crossing). Local attack vector and low privilege requirement reduce exploitability somewhat, but do not negate the severity. The memory corruption nature and widespread product presence elevate practical risk beyond the numeric score. Organizations with external-facing wireless services should treat this as critical.

Frequently asked questions