CVE-2025-20802 is a use-after-free vulnerability classified under CWE-416 found in the geniezone component of MediaTek's system-on-chip (SoC) platforms MT6991, MT8196, MT8367, MT8781, MT8786, and MT8793. The flaw arises from improper memory management where a previously freed memory region is accessed, leading to memory corruption. This corruption can be exploited by an attacker who already possesses System privileges on the device to escalate their privileges further, potentially gaining more control over the system. The vulnerability affects devices running Android 15.0 that incorporate these MediaTek SoCs. Exploitation does not require user interaction, which increases the risk of automated or stealthy attacks once initial access is obtained. The CVSS v3.1 base score is 6.7, reflecting a medium severity with the vector indicating local attack vector (AV:L), low attack complexity (AC:L), high privileges required (PR:H), no user interaction (UI:N), unchanged scope (S:U), and high impact on confidentiality, integrity, and availability (C:H/I:H/A:H). Although no public exploits have been reported, the vulnerability poses a significant risk in environments where attackers can gain System-level access, such as through other vulnerabilities or insider threats. The patch identifier ALPS10238968 addresses this issue, and it is tracked internally as MSV-4914 by MediaTek.

The primary impact of CVE-2025-20802 is local privilege escalation on affected devices, which can enable attackers with System privileges to gain even higher control, potentially leading to full device compromise. This can result in unauthorized access to sensitive data, modification or deletion of critical system files, and disruption of device availability. Since the vulnerability affects widely used MediaTek SoCs in Android 15 devices, it can impact smartphones, tablets, and embedded systems relying on these chipsets. Organizations deploying these devices in enterprise or sensitive environments face increased risk of insider attacks or post-exploitation lateral movement. The lack of required user interaction facilitates stealthy exploitation once initial access is achieved. Although exploitation requires existing System privileges, the vulnerability can be chained with other exploits to escalate privileges further. This can undermine device security, data confidentiality, and operational integrity, especially in sectors like telecommunications, finance, and government where MediaTek devices are prevalent.

To mitigate CVE-2025-20802, organizations and device manufacturers should promptly apply the official patch ALPS10238968 once it becomes available from MediaTek or device vendors. Until patches are deployed, restrict access to System-level privileges to trusted users and processes only, minimizing the attack surface. Employ robust endpoint detection and response (EDR) solutions to monitor for unusual local privilege escalation attempts or memory corruption indicators. Implement strict application sandboxing and privilege separation to limit the impact of compromised components. Conduct regular security audits and vulnerability assessments on devices incorporating affected MediaTek SoCs. For device manufacturers, integrate secure coding practices and memory safety checks in the geniezone component and related firmware. Additionally, maintain updated threat intelligence feeds to detect any emerging exploit attempts targeting this vulnerability. Finally, educate users and administrators about the risks of granting elevated privileges and the importance of timely updates.