CVE-2025-20990: 
NixOS vulnerability analysis and mitigation

CVE-2025-20990 is a security vulnerability discovered in Samsung Android devices, reported on February 17, 2025. The vulnerability affects Android versions 13, 14, and 15, specifically related to improper access control in accessing system device nodes. This security issue was privately disclosed to Samsung and was addressed in the August 2025 Security Maintenance Release (SMR) (Samsung Mobile).

The vulnerability is classified as Moderate severity with a CVSS 3.1 Base Score of 3.3 (LOW) according to NVD, while Samsung Mobile rates it at 4.0 (MEDIUM). The CVSS vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N, indicating local access is required, low attack complexity, low privileges required, no user interaction needed, and potential impact limited to confidentiality (NVD).

The vulnerability allows local attackers to access device identifier information through improper access control mechanisms in system device nodes. This access could potentially compromise device privacy by exposing identifying information (Samsung Mobile).

Samsung has addressed this vulnerability in the August 2025 Security Maintenance Release (SMR) by implementing proper access control mechanisms. Users are advised to update their devices to the latest security patch level that includes SMR Aug-2025 Release 1 (Samsung Mobile).