CVE-2025-20803: Google Android Privilege Escalation Flaw

CVE-2025-20803 Overview

CVE-2025-20803 is an integer overflow vulnerability affecting the DPE (Depth Processing Engine) component in MediaTek chipsets used in Google Android devices. The vulnerability enables memory corruption through integer overflow conditions, potentially allowing local privilege escalation when exploited by an attacker who has already obtained System privileges on the affected device.

Critical Impact

Local privilege escalation through memory corruption in MediaTek DPE component, requiring System-level access and user interaction for successful exploitation.

Affected Products

• Google Android 16.0
• MediaTek MT6899
• MediaTek MT6991
• MediaTek MT8793

Discovery Timeline

• January 6, 2026 - CVE-2025-20803 published to NVD
• January 8, 2026 - Last updated in NVD database

Technical Details for CVE-2025-20803

Vulnerability Analysis

This vulnerability exists within the DPE (Depth Processing Engine) driver used by MediaTek chipsets. The DPE is a hardware accelerator responsible for depth map processing in camera applications, commonly used for portrait mode, augmented reality features, and other depth-sensing functionalities on Android devices.

The core issue stems from an integer overflow condition (CWE-190) in the DPE component. When processing certain input values, arithmetic operations produce results that exceed the maximum value representable by the integer data type, causing the value to wrap around. This wraparound can lead to undersized memory allocations or incorrect buffer offset calculations, ultimately resulting in memory corruption.

The vulnerability requires an attacker to have already obtained System privileges on the device, indicating this is likely part of an exploit chain rather than an initial entry point. Additionally, user interaction is required for exploitation, suggesting the attack vector may involve opening a malicious file or interacting with a crafted application that triggers the vulnerable code path.

Root Cause

The root cause of CVE-2025-20803 is improper integer overflow handling in the DPE driver. When performing arithmetic operations on user-controllable or externally-influenced input values, the code fails to validate whether the resulting computation will exceed integer bounds. This lack of overflow checking allows carefully crafted inputs to trigger integer wraparound conditions.

In typical integer overflow scenarios within kernel or driver code, an overflow during size calculations can cause the allocation of a smaller-than-expected buffer. Subsequent write operations to this buffer then overflow its bounds, corrupting adjacent memory structures. This can be leveraged to achieve arbitrary code execution or privilege escalation.

Attack Vector

The attack vector for CVE-2025-20803 is local, meaning an attacker must have prior access to the device. The exploitation scenario involves:

1. An attacker with System-level privileges on the Android device
2. User interaction to trigger the vulnerable code path (such as opening a crafted media file or using a malicious application)
3. Supplying specially crafted input values to the DPE driver that cause integer overflow during arithmetic operations
4. Exploiting the resulting memory corruption to escalate privileges beyond System level or maintain persistent access

The vulnerability is contained within MediaTek's DPE component, which interfaces with the kernel for depth processing operations. Successful exploitation could allow an attacker to escape application sandboxes, modify protected system resources, or execute arbitrary code in kernel context.

Detection Methods for CVE-2025-20803

Indicators of Compromise

• Unusual DPE driver activity or crashes in system logs
• Unexpected memory allocation failures or kernel oops messages referencing DPE
• Evidence of privilege escalation attempts following System-level compromise
• Anomalous depth processing operations on devices without corresponding user activity

Detection Strategies

• Monitor Android system logs for DPE-related kernel panics or memory corruption errors
• Implement integrity monitoring for system partitions to detect unauthorized modifications
• Deploy mobile threat defense solutions capable of detecting privilege escalation attempts
• Review device audit logs for suspicious application behavior triggering camera or depth processing subsystems

Monitoring Recommendations

• Enable verbose kernel logging on managed enterprise devices to capture DPE driver events
• Utilize Android Enterprise security features to monitor for behavioral anomalies
• Implement SentinelOne Mobile Threat Defense for real-time detection of exploit attempts
• Configure alerts for applications requesting unusual combinations of system permissions

How to Mitigate CVE-2025-20803

Immediate Actions Required

• Apply the MediaTek security patch identified by Patch ID ALPS10199779 as soon as available through device manufacturer updates
• Ensure Android devices are updated to include the January 2026 security bulletin
• Restrict installation of applications from untrusted sources on affected devices
• Implement mobile device management policies to enforce timely security updates

Patch Information

MediaTek has released a security patch addressing this vulnerability. The patch is identified by Patch ID ALPS10199779 and Issue ID MSV-4504. Organizations should consult the MediaTek Security Bulletin for January 2026 for detailed remediation guidance.

Device manufacturers integrating MediaTek chipsets (MT6899, MT6991, MT8793) will incorporate this patch into their Android security updates. End users should ensure their devices are running the latest available firmware that includes the January 2026 security patches.

Workarounds

• Limit device access to trusted users only until patches can be applied
• Disable or restrict applications that heavily utilize depth processing features if not required for business operations
• Implement network segmentation for unpatched mobile devices to limit lateral movement potential
• Consider application whitelisting on enterprise-managed devices to reduce attack surface

# Check Android security patch level on device
adb shell getprop ro.build.version.security_patch

# Verify device firmware version includes January 2026 patches
# Expected output should show 2026-01-01 or later