CVE-2025-20768: 
NixOS vulnerability analysis and mitigation

CVE-2025-20768 is an out-of-bounds read vulnerability in the MediaTek display driver that could allow local escalation of privilege on affected Android devices. It affects Android versions 14.0, 15.0, and 16.0 running on a wide range of MediaTek chipsets, including MT6739, MT6761, MT6765, MT6768, MT6781, MT6789, MT6833, MT6835, MT6853, MT6855, MT6877, MT6878, MT6879, MT6883, MT6885, MT6886, MT6889, MT6893, MT6895, MT6897, MT6899, MT6983, MT6985, MT6989, and MT6991. The vulnerability was published on December 2, 2025, with a patch made available through MediaTek's December 2025 Product Security Bulletin (Patch ID: ALPS10196993; Issue ID: MSV-4805). It carries a CVSS v3.1 base score of 7.8 (High) (MediaTek Bulletin, Red Hat CVE).

The vulnerability is classified as CWE-125 (Out-of-bounds Read) and stems from a missing bounds check in the display component of MediaTek's Android driver stack. An attacker who has already obtained System-level privilege can trigger the out-of-bounds read, potentially leveraging it to further escalate privileges on the device. Exploitation requires local access and low privileges (System privilege as a precondition), but no user interaction is needed. No public proof-of-concept or detailed technical write-up has been identified at this time (MediaTek Bulletin, Red Hat CVE).

Successful exploitation could allow an attacker who already holds System privilege to escalate further, potentially gaining unauthorized access to sensitive data or executing arbitrary code at a higher privilege level. The vulnerability affects confidentiality, integrity, and availability — all rated High — on the local device. The scope is limited to the affected device and does not directly enable remote exploitation or lateral movement across a network (MediaTek Bulletin).

MediaTek has released a patch (Patch ID: ALPS10196993) through its December 2025 Product Security Bulletin. Device manufacturers and OEMs should integrate and distribute this patch to affected devices running Android 14.0, 15.0, or 16.0 on the listed MediaTek chipsets. Users should apply the latest available security patch level for their device as soon as it is made available by their device vendor. Additionally, organizations should enforce the principle of least privilege and restrict system-level access to minimize the risk of exploitation (MediaTek Bulletin, Lenovo Advisory).

Lenovo published a vendor advisory acknowledging the vulnerability in its MediaTek-based tablet products and directing customers to apply the December 2025 MediaTek security patches (Lenovo Advisory). Red Hat also tracked the CVE in its security database (Red Hat CVE). No significant researcher commentary or broader media coverage has been identified for this vulnerability.