CVE-2025-20770: Android Display Use-After-Free Vulnerability

CVE-2025-20770 Overview

CVE-2025-20770 is a use-after-free vulnerability in the display component of MediaTek chipsets affecting Android devices. This memory corruption flaw allows for local escalation of privilege when exploited by an attacker who has already obtained System-level privileges. The vulnerability does not require user interaction for exploitation, making it particularly dangerous in targeted attack scenarios.

The vulnerability is classified as CWE-416 (Use After Free) and has been assigned a CVSS 3.1 score of 6.7 (Medium severity). The attack vector is local, requiring low attack complexity but high privileges. Successful exploitation results in high impact to confidentiality, integrity, and availability.

Critical Impact

Local privilege escalation through memory corruption in display driver affecting 30+ MediaTek chipsets across Android 14, 15, and 16 devices.

Affected Products

• Google Android 14.0, 15.0, and 16.0
• MediaTek MT6700 Series (MT6739, MT6761, MT6765, MT6768, MT6781, MT6789)
• MediaTek MT6800 Series (MT6833, MT6835, MT6853, MT6855, MT6877, MT6878, MT6879, MT6883, MT6885, MT6886, MT6889, MT6893, MT6895, MT6897, MT6899)
• MediaTek MT6900 Series (MT6983, MT6985, MT6989, MT6991)
• MediaTek MT8000 Series (MT8196, MT8676, MT8678, MT8792, MT8793)
• MediaTek MT2718

Discovery Timeline

• 2025-12-02 - CVE-2025-20770 published to NVD
• 2025-12-03 - Last updated in NVD database

Technical Details for CVE-2025-20770

Vulnerability Analysis

CVE-2025-20770 is a use-after-free (UAF) vulnerability residing in the display driver component of MediaTek chipsets. Use-after-free vulnerabilities occur when a program continues to use memory after it has been freed, potentially allowing an attacker to manipulate the freed memory region to execute arbitrary code or escalate privileges.

The CVSS vector CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H indicates:

• Attack Vector (AV:L): Local access required
• Attack Complexity (AC:L): Low complexity to exploit
• Privileges Required (PR:H): High (System) privileges needed
• User Interaction (UI:N): No user interaction required
• Scope (S:U): Unchanged scope
• Impact: High impact on Confidentiality, Integrity, and Availability

The EPSS score of 0.005% places this vulnerability in the 24.3rd percentile for exploitation probability.

Root Cause

The vulnerability stems from improper memory management in the display driver component. When display-related memory objects are freed, references to those objects are not properly invalidated. This creates a condition where subsequent operations may reference the freed memory, leading to memory corruption.

The use-after-free condition in the display driver allows an attacker with System privileges to manipulate the freed memory region. By carefully timing memory allocations, an attacker could potentially overwrite the freed memory with controlled data, leading to arbitrary code execution at elevated privilege levels.

Attack Vector

The attack requires local access to the device and System-level privileges. An attacker who has already compromised a device to gain System privileges could exploit this vulnerability to further escalate privileges or maintain persistent access. The exploitation path involves:

1. Obtaining System-level privileges through a separate vulnerability or attack chain
2. Triggering the use-after-free condition in the display driver
3. Manipulating the freed memory to achieve code execution
4. Escalating privileges beyond System level or establishing persistence

The vulnerability is tracked internally by MediaTek as Patch ID: ALPS10196993 and Issue ID: MSV-4803.

Detection Methods for CVE-2025-20770

Indicators of Compromise

• Unusual display driver crashes or system instability
• Unexpected privilege escalation attempts from System-level processes
• Anomalous memory allocation patterns in display-related components
• Signs of persistence mechanisms following System compromise

Detection Strategies

Organizations should implement comprehensive endpoint monitoring to detect potential exploitation attempts:

Memory Monitoring: Deploy memory integrity monitoring solutions to detect anomalous memory access patterns, particularly in kernel-level display drivers.

Behavioral Analysis: Monitor for unusual process behavior following display driver interactions, including unexpected privilege changes or memory manipulation.

Android Security Logs: Review Android system logs for display driver errors, crashes, or exceptions that could indicate exploitation attempts.

SentinelOne Singularity Platform: SentinelOne's behavioral AI engine can detect exploitation attempts through real-time monitoring of system calls, memory access patterns, and privilege escalation indicators across Android endpoints.

Monitoring Recommendations

• Enable comprehensive logging for kernel-level display driver operations
• Monitor for System-level processes exhibiting unusual memory access patterns
• Implement alerting for display driver crashes or exceptions
• Deploy endpoint detection and response (EDR) solutions capable of detecting memory corruption exploits

How to Mitigate CVE-2025-20770

Immediate Actions Required

• Apply the December 2025 MediaTek security patch (ALPS10196993) as soon as available from your device manufacturer
• Ensure Android security patch level is current for all affected devices
• Limit applications with System-level privileges to trusted sources only
• Implement defense-in-depth strategies to prevent initial System compromise

Patch Information

MediaTek has released a security patch addressing this vulnerability, tracked as Patch ID ALPS10196993. The fix is documented in the MediaTek December 2025 Product Security Bulletin.

Organizations should:

1. Contact device manufacturers for availability of security updates
2. Prioritize patching for devices with sensitive data or elevated risk profiles
3. Verify patch installation through Android security patch level verification

Workarounds

If immediate patching is not possible, organizations should implement compensating controls:

• Restrict physical access to affected devices
• Audit and minimize applications running with System-level privileges
• Deploy mobile threat defense (MTD) solutions to detect exploitation attempts
• Implement network segmentation for affected mobile devices
• Consider temporarily isolating high-risk devices until patches can be applied

Organizations using SentinelOne Mobile can leverage the platform's behavioral detection capabilities to identify potential exploitation attempts while awaiting vendor patches.