CVE-2025-20770 Overview
CVE-2025-20770 is a use-after-free [CWE-416] vulnerability in the display component shipped with MediaTek chipsets used in Google Android devices. The flaw allows local escalation of privilege when an attacker already holds System-level privileges. No user interaction is required for exploitation. MediaTek tracks the fix under Patch ID ALPS10196993 and Issue ID MSV-4803.
The issue affects Android 14, 15, and 16 builds running on more than 30 MediaTek SoC families, including Dimensity, Helio, and automotive-class chips such as MT8676 and MT8678. MediaTek published the fix in its December 2025 Product Security Bulletin.
Critical Impact
Successful exploitation enables a local attacker with existing System privileges to corrupt memory in the display driver and escalate to higher-privileged execution contexts on affected Android devices.
Affected Products
- Google Android 14.0, 15.0, and 16.0
- MediaTek smartphone SoCs including MT6739, MT6761, MT6765, MT6768, MT6781, MT6789, MT6833, MT6853, MT6877, MT6883, MT6885, MT6893, MT6895, MT6897, MT6983, MT6985, MT6989, and MT6991
- MediaTek automotive and tablet platforms MT2718, MT8196, MT8676, MT8678, MT8792, and MT8793
Discovery Timeline
- 2025-12-02 - CVE-2025-20770 published to NVD
- 2025-12-02 - MediaTek discloses the issue in the December 2025 Product Security Bulletin
- 2025-12-03 - Last updated in NVD database
Technical Details for CVE-2025-20770
Vulnerability Analysis
The vulnerability resides in the MediaTek display driver component used by Android. A use-after-free [CWE-416] condition occurs when the driver references a memory object after it has been freed. An attacker holding System privileges can trigger the dangling pointer access, manipulate the freed allocation, and corrupt kernel-managed memory.
Because the flaw lives in a hardware-adjacent kernel component, successful corruption can yield control over kernel data structures. This enables the attacker to escalate from the Android System privilege boundary to higher-privileged contexts such as the kernel itself. The vulnerability is local-only and does not require user interaction.
Root Cause
The root cause is improper lifecycle management of a display-related kernel object. The driver retains or dereferences a pointer to an allocation that has already been released. When the freed memory is later reallocated for attacker-controlled content, the stale reference operates on data the attacker controls.
Attack Vector
Exploitation requires local code execution at the System privilege level on the target device. From that foothold, an attacker invokes the vulnerable display driver path to trigger the free-then-reuse sequence. The attacker then races to reclaim the freed slab with crafted data, achieving controlled memory corruption inside the kernel display subsystem.
The vulnerability does not provide an initial entry point. It is intended as a second-stage primitive used to break out of the System sandbox after an initial compromise, such as a malicious app that has already gained system_server or system_app privileges.
No verified public exploit code is available. See the MediaTek Security Bulletin December 2025 for vendor-supplied details.
Detection Methods for CVE-2025-20770
Indicators of Compromise
- Unexpected crashes or kernel panics referencing the MediaTek display driver in dmesg or tombstone logs
- KASAN or kernel oops reports flagging use-after-free conditions in display-related call stacks
- Android processes running with System UID making unusual ioctl calls to display device nodes
Detection Strategies
- Audit installed packages for apps holding the android.uid.system UID or signed with platform keys, and verify their provenance
- Inspect kernel crash logs for repeated faults inside MediaTek display kernel modules, which can indicate exploitation attempts
- Correlate privilege-escalation telemetry from mobile threat defense agents with abnormal access to /dev/mtk_disp* or related device nodes
Monitoring Recommendations
- Enable Android Verified Boot and monitor for boot integrity failures across MediaTek-based fleets
- Forward device kernel logs and SELinux denials to a centralized data lake for retrospective hunting on display driver anomalies
- Track MediaTek Security Patch Level (SPL) compliance across managed devices through your MDM or UEM platform
How to Mitigate CVE-2025-20770
Immediate Actions Required
- Apply the December 2025 MediaTek security patch (ALPS10196993, Issue MSV-4803) as soon as it is delivered by the device OEM
- Update managed Android devices to a build reporting the December 2025 or later Android Security Patch Level
- Restrict installation of side-loaded or unsigned applications that could chain prior vulnerabilities to obtain System privileges
Patch Information
MediaTek released the fix in the MediaTek Security Bulletin December 2025. The bulletin lists the affected SoCs and references Patch ID ALPS10196993. Device manufacturers must integrate this fix into their Android security patch rollouts before end users receive remediation.
Workarounds
- No vendor-supplied workaround exists; patching is the only supported remediation
- Where patches are not yet available, enforce strict application vetting and disable installation from unknown sources
- Segment high-value mobile devices from sensitive corporate resources until the December 2025 MediaTek patch level is confirmed
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.