CVE-2025-20782 Overview
CVE-2025-20782 is an out-of-bounds write vulnerability affecting the display driver component in MediaTek chipsets running on Android devices. The vulnerability exists due to a missing bounds check in the display subsystem, which could allow an attacker who has already obtained System-level privileges to escalate their access further. This is a local privilege escalation vulnerability that does not require user interaction for exploitation.
Critical Impact
Local privilege escalation in MediaTek display driver affects over 45 chipset models across smartphones and tablets running Android 14.0, 15.0, and 16.0
Affected Products
- Google Android 14.0, 15.0, and 16.0
- MediaTek MT67xx series chipsets (MT6739, MT6761, MT6765, MT6768, MT6781, MT6789, MT6833, MT6835, MT6853, MT6855, MT6877, MT6878, MT6879, MT6883, MT6885, MT6886, MT6889, MT6893, MT6895, MT6897, MT6899, MT6983, MT6985, MT6989, MT6991)
- MediaTek MT81xx/MT87xx series chipsets (MT8186, MT8188, MT8196, MT8667, MT8673, MT8676, MT8678, MT8765, MT8766, MT8768, MT8771, MT8781, MT8791T, MT8792, MT8793, MT8795T, MT8796, MT8798, MT8873, MT8883)
Discovery Timeline
- January 6, 2026 - CVE-2025-20782 published to NVD
- January 8, 2026 - Last updated in NVD database
Technical Details for CVE-2025-20782
Vulnerability Analysis
This vulnerability is classified as CWE-787 (Out-of-Bounds Write), a memory corruption issue that occurs when the display driver fails to properly validate input boundaries before writing data to memory buffers. The flaw resides in the display subsystem of MediaTek's chipset drivers, which are responsible for managing graphics rendering and display output on Android devices.
The vulnerability requires an attacker to already possess System-level privileges on the device, making this a post-compromise privilege escalation scenario. Once exploited, an attacker could potentially write arbitrary data outside the intended memory boundaries, corrupting adjacent memory structures or executing malicious code with elevated kernel-level privileges.
Root Cause
The root cause of CVE-2025-20782 is a missing bounds check in the MediaTek display driver code. When processing display-related operations, the driver fails to validate that write operations remain within allocated buffer boundaries. This oversight allows specially crafted input to trigger memory writes beyond the intended buffer limits, potentially corrupting critical kernel data structures or enabling arbitrary code execution.
The vulnerability is tracked internally by MediaTek as Patch ID: ALPS10182882 and Issue ID: MSV-4685.
Attack Vector
The attack vector for this vulnerability is local, meaning an attacker must have existing access to the device to exploit it. The exploitation chain typically involves:
- An attacker first compromises the device through another vulnerability or malicious application to obtain System-level privileges
- The attacker then leverages CVE-2025-20782 to trigger the out-of-bounds write condition in the display driver
- By carefully crafting the malicious input, the attacker can overwrite critical memory regions
- Successful exploitation results in kernel-level code execution or further privilege escalation beyond System privileges
No user interaction is required once the attacker has established the initial foothold on the device.
Detection Methods for CVE-2025-20782
Indicators of Compromise
- Unusual display driver crashes or kernel panics related to the MediaTek display subsystem
- Unexpected memory corruption errors in system logs referencing display buffer operations
- Abnormal process behavior with elevated privileges attempting to interact with display driver interfaces
- System instability following suspicious application installations or unauthorized system access
Detection Strategies
- Monitor Android system logs for MediaTek display driver errors or exceptions indicating buffer overflows
- Implement kernel-level memory corruption detection tools that can identify out-of-bounds write attempts
- Deploy mobile threat detection solutions capable of identifying privilege escalation attempts
- Review installed applications for suspicious permissions requesting system-level access
Monitoring Recommendations
- Enable detailed kernel logging for MediaTek display driver components
- Implement SELinux/SEAndroid policy monitoring to detect privilege escalation attempts
- Monitor for unauthorized modifications to system partitions or kernel modules
- Deploy endpoint detection solutions with behavioral analysis capabilities for Android devices
How to Mitigate CVE-2025-20782
Immediate Actions Required
- Apply the January 2026 Android security update from your device manufacturer as soon as available
- Verify that devices are running the latest firmware version that includes the MediaTek security patch
- Restrict installation of applications from untrusted sources to reduce initial compromise risk
- Ensure device management policies enforce prompt security updates
Patch Information
MediaTek has released a security patch addressing this vulnerability, tracked as Patch ID: ALPS10182882. The fix is documented in the MediaTek Security Bulletin - January 2026. Device manufacturers will incorporate this patch into their Android security updates, and end users should apply these updates through their device's standard update mechanism.
Organizations managing Android device fleets should prioritize deployment of the January 2026 security patches to all affected MediaTek-based devices.
Workarounds
- Implement strict application whitelisting policies to prevent untrusted code execution
- Enable Android's Verified Boot to ensure system integrity and detect unauthorized modifications
- Use Mobile Device Management (MDM) solutions to enforce security policies and monitor device compliance
- Limit administrative access and avoid granting System-level privileges to applications unless absolutely necessary
- Consider network segmentation for devices that cannot be immediately patched
# Verify Android security patch level
adb shell getprop ro.build.version.security_patch
# Expected output should be 2026-01-05 or later for patched devices
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
