CVE-2025-21026: 
NixOS vulnerability analysis and mitigation

CVE-2025-21026 is a security vulnerability discovered in Samsung's ImsService component. The vulnerability was reported on April 28, 2025, and was disclosed privately. It affects Android versions 13, 14, 15, and 16 on Samsung mobile devices. The issue stems from improper handling of insufficient permissions in the ImsService component (Samsung Mobile).

The vulnerability has been assigned a CVSS v3.1 Base Score of 3.3 (LOW) by NIST with the following vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L. Samsung Mobile assigned it a slightly higher score of 4.0 (MEDIUM) with the vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N. The vulnerability requires local access to exploit, has low attack complexity, and affects the availability of the service (NVD).

When exploited, this vulnerability allows local attackers to interrupt calls on affected devices. The impact is primarily focused on service availability, with no direct impact on confidentiality or integrity of the system (Samsung Mobile).

Samsung has addressed this vulnerability in their September 2025 Security Maintenance Release (SMR). The patch removes unused code that was causing the permission handling issue. Users should update their devices to SMR Sep-2025 Release 1 or later to protect against this vulnerability (Samsung Mobile).