CVE-2025-20707: 
NixOS vulnerability analysis and mitigation

A medium-severity vulnerability (CVE-2025-20707) was discovered in MediaTek's geniezone component. The vulnerability is a use-after-free memory corruption issue that could enable local privilege escalation. The flaw was discovered and disclosed in September 2025, affecting various MediaTek chipsets running on Android versions 13.0 through 15.0 (MediaTek Bulletin).

The vulnerability is classified as CWE-416 (Use After Free) with a CVSS v3.1 base score of 6.7 (Medium). The technical assessment indicates that exploitation requires high privileges (PR:H) with local access (AV:L), low attack complexity (AC:L), and no user interaction (UI:N). If successfully exploited, the vulnerability could lead to high impacts on confidentiality, integrity, and availability (C:H/I:H/A:H) (CISA-ADP).

The vulnerability affects multiple MediaTek chipset models including MT2718, MT6853, MT6877, MT6893, MT6899, MT6991, MT8196, MT8676, MT8678, MT8775, MT8786, MT8788E, MT8791T, MT8792, MT8796, MT8883, and MT8893. The flaw impacts devices running Android versions 13.0, 14.0, and 15.0 (MediaTek Bulletin).

MediaTek has developed and distributed patches to address this vulnerability. Device OEMs were notified and provided with security patches at least two months before public disclosure. Users are advised to apply security updates from their device manufacturers as they become available (MediaTek Bulletin).

MediaTek has emphasized their commitment to chipset and product security, noting that proactive notification and remediation preceded public disclosure. The company has implemented a coordinated disclosure process, providing OEMs adequate time to integrate patches before public announcement (GBHackers).