Use-After-Free in MediaTek Display Driver Enables Local Priv Escalation
CVE-2025-20786 Published on January 6, 2026
In display, there is a possible memory corruption due to use after free. This could lead to local escalation of privilege if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: ALPS10149882; Issue ID: MSV-4673.
Vulnerability Analysis
CVE-2025-20786 is exploitable with local system access, and requires user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.
Weakness Type
What is a Double-free Vulnerability?
The product calls free() twice on the same memory address, potentially leading to modification of unexpected memory locations. When a program calls free() twice with the same argument, the program's memory management data structures become corrupted. This corruption can cause the program to crash or, in some circumstances, cause two later calls to malloc() to return the same pointer. If malloc() returns the same value twice and the program later gives the attacker control over the data that is written into this doubly-allocated memory, the program becomes vulnerable to a buffer overflow attack.
CVE-2025-20786 has been classified to as a Double-free vulnerability or weakness.
Products Associated with CVE-2025-20786
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Affected Versions
MediaTek, Inc. MediaTek chipset:- Version MT6739 is affected.
- Version MT6761 is affected.
- Version MT6765 is affected.
- Version MT6768 is affected.
- Version MT6781 is affected.
- Version MT6789 is affected.
- Version MT6833 is affected.
- Version MT6835 is affected.
- Version MT6853 is affected.
- Version MT6855 is affected.
- Version MT6877 is affected.
- Version MT6878 is affected.
- Version MT6879 is affected.
- Version MT6883 is affected.
- Version MT6885 is affected.
- Version MT6886 is affected.
- Version MT6889 is affected.
- Version MT6893 is affected.
- Version MT6895 is affected.
- Version MT6897 is affected.
- Version MT6899 is affected.
- Version MT6983 is affected.
- Version MT6985 is affected.
- Version MT6989 is affected.
- Version MT6991 is affected.
- Version MT8186 is affected.
- Version MT8188 is affected.
- Version MT8196 is affected.
- Version MT8667 is affected.
- Version MT8673 is affected.
- Version MT8676 is affected.
- Version MT8678 is affected.
- Version MT8765 is affected.
- Version MT8766 is affected.
- Version MT8768 is affected.
- Version MT8771 is affected.
- Version MT8781 is affected.
- Version MT8791T is affected.
- Version MT8792 is affected.
- Version MT8793 is affected.
- Version MT8795T is affected.
- Version MT8796 is affected.
- Version MT8798 is affected.
- Version MT8873 is affected.
- Version MT8883 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.