CVE-2025-20806: 
NixOS vulnerability analysis and mitigation

CVE-2025-20806 is a use-after-free memory corruption vulnerability in the MediaTek dpe component that can lead to local escalation of privilege on affected Android devices. It affects Google Android 16.0 running on MediaTek chipsets MT6899, MT6991, and MT8793. The vulnerability was published on January 5, 2026, with a patch included in MediaTek's January 2026 security bulletin (Patch ID: ALPS10114835; Issue ID: MSV-4479). 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), occurring within the dpe component of MediaTek's Android firmware. A use-after-free condition arises when memory is accessed after it has been freed, potentially allowing an attacker to corrupt memory and redirect code execution. Exploitation requires the attacker to have already obtained System-level privileges on the device, making this a local, post-compromise privilege escalation vector. No user interaction is required once System privilege is established (MediaTek Advisory).

Successful exploitation of this vulnerability can result in high impact to confidentiality, integrity, and availability — an attacker with System privilege could escalate further, gain unauthorized access to sensitive data, modify system data, or cause system crashes. The scope is limited to the affected device (unchanged scope), but the combination of all three high-impact CIA triad components makes this a significant local privilege escalation risk on affected MediaTek-based Android 16.0 devices (MediaTek Advisory, Red Hat CVE).

There is no public proof-of-concept exploit available, and no evidence of in-the-wild exploitation has been reported as of the time of publication. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. The EPSS score is approximately 0.018%, reflecting a very low probability of exploitation in the near term. Exploitation is constrained by the prerequisite of System-level privilege, significantly limiting the attacker pool (MediaTek Advisory).

MediaTek has released a patch (Patch ID: ALPS10114835) addressing this vulnerability, included in the MediaTek January 2026 Security Bulletin. Device manufacturers and OEMs should integrate and distribute this patch to affected devices running Android 16.0 on MT6899, MT6991, and MT8793 chipsets. Lenovo has also published a corresponding advisory for affected MediaTek-based tablets. As a compensating control, organizations should restrict System-level privilege access to only trusted and verified applications and processes, and monitor for anomalous privilege escalation activity (MediaTek Advisory, Lenovo Advisory).