Qualcomm GPU Micronode Privilege Bypass and Memory Corruption Vulnerability (CVE-2025-21479) Technical Advisory

1. Vulnerability Overview & Root Cause

This vulnerability (CVE-2025-21479) is a critical memory corruption issue caused by improper authorization (CWE-863) within the Qualcomm GPU micronode. The GPU micronode is a dedicated firmware component responsible for low-level graphics processing and scheduling. The root cause lies in the lack of proper validation when executing a specific sequence of commands, allowing unauthorized commands to bypass security boundaries and corrupt GPU memory space.

2. Exploitation Mechanics & Attack Scenario

To exploit this vulnerability, an attacker must first gain local execution capabilities on the target device (e.g., through a malicious non-privileged application or local shell access). The attacker then crafts and submits a malicious sequence of commands to the GPU micronode via the kernel graphics driver. Because the micronode fails to validate the authorization of these commands, it processes them, leading to out-of-bounds memory access or pointer corruption. This memory corruption can be leveraged to overwrite critical kernel structures, enabling the attacker to escape application sandboxes and execute arbitrary code with kernel privileges.

3. Infrastructure & Business Impact

As this vulnerability is actively exploited in the wild and listed in the CISA KEV catalog, it poses an immediate threat to enterprise mobile fleets and IoT infrastructures utilizing Qualcomm chipsets. Successful exploitation compromises the entire device's confidentiality, integrity, and availability, allowing attackers to exfiltrate sensitive corporate data, bypass multi-factor authentication (MFA) tokens stored on the device, and establish persistent access.