CVE-2025-20787: 
NixOS vulnerability analysis and mitigation

CVE-2025-20787 is a use-after-free memory corruption vulnerability in the MediaTek display component that can lead to local escalation of privilege. It affects Android versions 14.0, 15.0, and 16.0 running on a wide range of MediaTek chipsets (MT2718, 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, MT8196, MT8676, MT8678, MT8796). The vulnerability was published on January 5–6, 2026, and patched in MediaTek's January 2026 Product Security Bulletin (Patch ID: ALPS10149879; Issue ID: MSV-4658). It carries a CVSS v3.1 base score of 6.7 (Medium) (MediaTek Advisory, Red Hat CVE).

The vulnerability is classified as CWE-416 (Use After Free) and resides in the display subsystem of MediaTek-powered Android devices. A use-after-free condition occurs when memory that has already been freed is subsequently accessed, enabling an attacker to corrupt memory and potentially redirect code execution. Exploitation requires the attacker to have already obtained System-level privilege on the device; no user interaction is needed once that precondition is met. The attack vector is local, with low attack complexity and high privileges required (MediaTek Advisory, Red Hat CVE).

Successful exploitation of CVE-2025-20787 can result in memory corruption within the display component, leading to local escalation of privilege beyond the System level. The vulnerability has high confidentiality, integrity, and availability impact, meaning an attacker could potentially access sensitive data, modify system state, or cause denial of service on the affected device. Because exploitation requires pre-existing System privilege, the practical blast radius is constrained to scenarios where an attacker has already achieved a significant foothold on the device (MediaTek Advisory).

There is no public proof-of-concept exploit and no evidence of in-the-wild exploitation at this time. The EPSS score is approximately 0.018% (0.000180), indicating a very low probability of exploitation in the near term. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. No threat actor attribution has been reported (Red Hat CVE, MediaTek Advisory).

MediaTek has released a patch (Patch ID: ALPS10149879) addressing this vulnerability, published in the January 2026 MediaTek 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. Lenovo has also published a corresponding advisory for affected MediaTek-based tablets. Users should apply OTA updates from their device vendor as soon as they become available, and restrict System-level access to trusted applications only as an interim measure (MediaTek Advisory, Lenovo Advisory).