CVE-2025-20806 is a use-after-free vulnerability classified under CWE-416, discovered in the dpe component of MediaTek chipsets MT6899, MT6991, and MT8793. Use-after-free vulnerabilities occur when a program continues to use a pointer after the memory it points to has been freed, leading to memory corruption. In this case, the flaw can be exploited locally by an attacker who already has System-level privileges on the device, allowing them to escalate privileges further or execute arbitrary code with elevated rights. The vulnerability does not require user interaction, which increases the risk of automated or stealthy exploitation. The CVSS v3.1 base score is 6.7, reflecting a medium severity level due to the requirement of high privileges for exploitation but with high impact on confidentiality, integrity, and availability. The vulnerability was published in early 2026, with no known exploits in the wild at this time. While no direct patch links are provided, MediaTek has assigned a patch ID (ALPS10114835) indicating that a fix is available or forthcoming. This vulnerability primarily affects devices using the specified MediaTek chipsets, which are commonly found in smartphones, tablets, and IoT devices. The flaw could be leveraged by malicious insiders or malware that has already compromised the system to gain further control or disrupt device operation.

The primary impact of CVE-2025-20806 is local privilege escalation on devices using affected MediaTek chipsets. An attacker with System privileges could exploit this vulnerability to gain higher privileges or execute arbitrary code, potentially leading to full device compromise. This could result in unauthorized access to sensitive data, modification or deletion of critical system files, and disruption of device functionality. Given the widespread use of MediaTek chipsets in mobile and embedded devices globally, the vulnerability could affect millions of devices, particularly in consumer electronics and IoT environments. The lack of user interaction requirement means automated attacks or malware could exploit this flaw once initial access is obtained. Although no public exploits are known yet, the medium severity score and high impact on confidentiality, integrity, and availability make this a significant risk for organizations relying on affected hardware. Failure to patch could lead to increased risk of insider threats, advanced persistent threats, or malware escalation on compromised devices.

1. Apply vendor-provided patches promptly once available, referencing MediaTek patch ID ALPS10114835 or official security advisories. 2. Restrict local System-level access to trusted users only, minimizing the risk of privilege escalation by malicious insiders or malware. 3. Implement robust endpoint detection and response (EDR) solutions to monitor for suspicious local activity indicative of exploitation attempts. 4. Employ application whitelisting and privilege management to limit the execution of unauthorized code with elevated privileges. 5. Regularly audit device configurations and installed software to detect unauthorized changes or presence of malware. 6. For organizations deploying devices with affected chipsets, consider network segmentation and least privilege principles to contain potential compromises. 7. Educate users and administrators about the risks of local privilege escalation vulnerabilities and the importance of timely patching. 8. Monitor threat intelligence feeds for any emerging exploit code or attack campaigns targeting this vulnerability to respond rapidly.