CVE-2025-20807: 
NixOS vulnerability analysis and mitigation

CVE-2025-20807 is an integer overflow vulnerability in the dpe component of MediaTek chipsets that can lead to an out-of-bounds write and local escalation of privilege. It affects devices running Android 16.0 with MediaTek chipsets MT6899, MT6991, and MT8793. The vulnerability was disclosed by MediaTek on January 5–6, 2026, with a patch published in the January 2026 MediaTek Product Security Bulletin. It carries a CVSS v3.1 base score of 6.7 (Medium), assigned by CISA-ADP (MediaTek Advisory, Feedly).

The root cause is an integer overflow (CWE-190 / CAPEC-92: Forced Integer Overflow) in the dpe component, which results in an out-of-bounds write condition. Exploitation requires the attacker to have already obtained System-level privilege on the device, making this a local, post-compromise attack vector. No user interaction is required. The patch is identified as ALPS10114841 (Issue ID: MSV-4451) (MediaTek Advisory, Feedly).

Successful exploitation allows a malicious actor who already holds System privilege to further escalate privileges on the affected device, with high impact to confidentiality, integrity, and availability. This could result in unauthorized access to sensitive data, unauthorized modification of system data, and denial of service conditions. The attack is limited to local access and does not cross security scope boundaries (MediaTek Advisory, Feedly).

There is no public proof-of-concept exploit and no evidence of in-the-wild exploitation as of the time of disclosure. 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. Exploitation is constrained by the prerequisite of System-level privilege, significantly limiting the attacker pool (Feedly).

MediaTek has released a patch (ALPS10114841) addressed in the January 2026 Product Security Bulletin. Users and OEMs with devices running Android 16.0 on affected chipsets (MT6899, MT6991, MT8793) should apply the available security update as soon as it is distributed by their device manufacturer. Lenovo has also published a corresponding advisory for affected MediaTek-based tablets. As a defense-in-depth measure, organizations should enforce strict access controls to limit System-level privilege grants while patches are being deployed (MediaTek Advisory, Lenovo Advisory).

Security Online Info covered the January 2026 MediaTek security bulletin as part of a broader report on MediaTek's chipset security overhaul for the new year. Lenovo issued a dedicated advisory for its MediaTek-based tablet products affected by this and related vulnerabilities from the same bulletin. No significant researcher commentary or social media discussion specific to CVE-2025-20807 has been observed, consistent with the lack of public exploit code and the constrained exploitation prerequisites (SecurityOnline, Lenovo Advisory).