CVE-2025-20802 Overview
CVE-2025-20802 is a use-after-free vulnerability in the Geniezone component of MediaTek chipsets running Google Android. This memory corruption flaw occurs when the system accesses memory after it has been freed, potentially allowing an attacker with existing System privileges to achieve local privilege escalation. The vulnerability does not require user interaction for exploitation, making it particularly concerning for compromised devices.
Critical Impact
Local privilege escalation through memory corruption in MediaTek Geniezone component, enabling attackers with System privileges to potentially gain full device control.
Affected Products
- Google Android 15.0
- MediaTek MT6991
- MediaTek MT8196
- MediaTek MT8367
- MediaTek MT8781
- MediaTek MT8786
- MediaTek MT8793
Discovery Timeline
- January 6, 2026 - CVE-2025-20802 published to NVD
- January 8, 2026 - Last updated in NVD database
Technical Details for CVE-2025-20802
Vulnerability Analysis
This vulnerability is classified under CWE-416 (Use After Free), a class of memory corruption vulnerabilities that occurs when a program continues to use a pointer after the memory it references has been deallocated. In the context of MediaTek's Geniezone component, this flaw creates a condition where freed memory can be reallocated and manipulated by an attacker, leading to arbitrary code execution within privileged contexts.
The Geniezone component is MediaTek's secure virtualization hypervisor technology, responsible for isolating sensitive operations from the main Android operating system. A use-after-free vulnerability in this critical security component is particularly severe as it could allow attackers to break out of security isolation boundaries.
Root Cause
The root cause of CVE-2025-20802 lies in improper memory lifecycle management within the Geniezone hypervisor. The component fails to properly invalidate pointers after freeing associated memory objects, leaving dangling pointers that can be exploited. When subsequent operations reference these stale pointers, the program may read or write to memory that has been reallocated for a different purpose, enabling memory corruption.
Attack Vector
The attack vector for this vulnerability is local, requiring an attacker to have already obtained System-level privileges on the affected device. From this elevated position, the attacker can:
- Trigger the vulnerable code path in Geniezone that leads to memory being freed
- Manipulate heap allocation to control the contents of the freed memory region
- Cause the dangling pointer to be dereferenced, allowing arbitrary memory read/write
- Escalate privileges further or execute arbitrary code within the hypervisor context
Since no user interaction is required, an attacker with System privileges could automate the exploitation process. The vulnerability affects the confidentiality, integrity, and availability of the system with high impact in all three areas.
Detection Methods for CVE-2025-20802
Indicators of Compromise
- Unusual system crashes or instability related to Geniezone or hypervisor components
- Unexpected privilege escalation events from System to higher privilege levels
- Anomalous memory access patterns in kernel or hypervisor logs
- Signs of heap spray attacks or suspicious memory allocation behavior
Detection Strategies
- Monitor system logs for Geniezone-related crashes or error messages indicating memory corruption
- Implement memory integrity monitoring tools to detect use-after-free exploitation attempts
- Deploy endpoint detection solutions capable of identifying privilege escalation chains
- Review process execution chains for suspicious System-level processes attempting hypervisor access
Monitoring Recommendations
- Enable comprehensive logging for MediaTek-specific components and kernel modules
- Deploy SentinelOne Singularity Platform for real-time behavioral analysis and threat detection on Android devices
- Implement anomaly detection for memory allocation patterns in critical system components
- Monitor for lateral movement attempts following potential exploitation
How to Mitigate CVE-2025-20802
Immediate Actions Required
- Apply the security patch identified by MediaTek Patch ID ALPS10238968 as soon as available
- Review device fleet for affected MediaTek chipsets and prioritize patching
- Restrict installation of untrusted applications that could potentially achieve System privileges
- Consider isolating high-risk devices until patches are applied
Patch Information
MediaTek has addressed this vulnerability and assigned Patch ID ALPS10238968 (Issue ID: MSV-4914). Organizations should consult the MediaTek Product Security Bulletin for January 2026 for detailed patch information and update their devices through official Android security updates or OEM-provided firmware updates.
Workarounds
- Limit applications with System-level privileges to trusted, verified software only
- Implement strict application whitelisting on affected devices
- Monitor and restrict debugging interfaces that could be used to gain elevated privileges
- Deploy mobile threat defense solutions to detect and block exploitation attempts before patch deployment
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
