CVE-2025-20636: 
NixOS vulnerability analysis and mitigation

CVE-2025-20636 is a security vulnerability discovered in MediaTek's secmem component, disclosed on February 2, 2025. The vulnerability affects multiple MediaTek chipsets used in Android devices running versions 12.0 through 15.0. This out-of-bounds write vulnerability occurs due to a missing bounds check in the secmem component (Vendor Advisory).

The vulnerability is classified as an out-of-bounds write (CWE-787) with a CVSS v3.1 base score of 6.7 (Medium) according to NIST, and 7.8 (High) according to CISA-ADP. The technical assessment indicates local attack vector (AV:L), low attack complexity (AC:L), and requires high privileges (PR:H) with no user interaction (UI:N) needed for exploitation (NVD).

If exploited, this vulnerability could lead to local escalation of privilege, but only if a malicious actor has already obtained System privilege. The vulnerability affects a wide range of MediaTek chipsets, including MT6580, MT6739, MT6761, and many others, potentially impacting numerous Android devices running versions 12.0 through 15.0 (Vendor Advisory).

MediaTek has addressed this vulnerability through a security patch (Patch ID: ALPS09403554). The fix has been distributed to device manufacturers at least two months prior to the public disclosure. Users are advised to apply the latest security updates provided by their device manufacturers (Vendor Advisory).