CVE-2025-36900 is a vulnerability identified in the Android kernel, specifically within the function lwis_test_register_io of the lwis_device_test.c source file. The root cause is an integer overflow that leads to an out-of-bounds (OOB) write operation. This type of memory corruption can allow an attacker to overwrite adjacent memory regions, potentially leading to arbitrary code execution or privilege escalation. The vulnerability requires the attacker to have system execution privileges initially (PR:H), indicating that some level of privilege is necessary to exploit it. However, no user interaction is required (UI:N), which means the exploit can be triggered without any action from the user once the attacker has the necessary privileges. The CVSS v3.1 base score is 6.7, categorized as medium severity, reflecting the significant impact on confidentiality, integrity, and availability (all rated high in the CVSS vector). The vulnerability falls under CWE-190 (Integer Overflow or Wraparound), a common weakness that can cause memory corruption issues. No known exploits are currently reported in the wild, and no patches have been linked yet. The vulnerability affects the Android kernel, which is a core component of Android devices, including smartphones, tablets, and embedded systems running Android. Exploitation could allow local attackers to escalate privileges, potentially gaining full control over the device kernel and bypassing security mechanisms. This could lead to unauthorized access to sensitive data, persistent malware installation, or disruption of device functionality.

For European organizations, this vulnerability poses a significant risk primarily to those deploying Android devices within their infrastructure or relying on Android-based embedded systems. The ability to escalate privileges locally could allow attackers to compromise corporate mobile devices, leading to data breaches, unauthorized access to corporate networks, and potential lateral movement within enterprise environments. Given the high confidentiality, integrity, and availability impact, sensitive information stored or accessed via Android devices could be exposed or manipulated. The lack of user interaction requirement increases the risk of automated or stealthy exploitation once an attacker gains initial access. This is particularly concerning for sectors with high mobile device usage such as finance, healthcare, and government agencies in Europe. Additionally, Android devices used in industrial control systems or IoT deployments could be targeted to disrupt operations or gain footholds in critical infrastructure. The absence of known exploits currently provides a window for proactive mitigation, but the medium severity score and the nature of the vulnerability suggest that exploitation could become more prevalent if patches are delayed.

European organizations should prioritize the following mitigation steps: 1) Monitor for official patches or security updates from Google and Android device manufacturers and deploy them promptly once available. 2) Restrict system-level privileges on Android devices by enforcing the principle of least privilege, limiting the number of users and applications with system execution rights to reduce the attack surface. 3) Employ mobile device management (MDM) solutions to enforce security policies, control app installations, and monitor device behavior for signs of exploitation attempts. 4) Conduct regular security audits and vulnerability assessments on Android devices within the organization to identify potentially vulnerable systems. 5) Educate IT staff and users about the risks of privilege escalation vulnerabilities and the importance of applying updates. 6) For critical environments, consider isolating Android devices or restricting their network access to minimize potential lateral movement if compromised. 7) Implement runtime protection mechanisms or kernel integrity monitoring tools where feasible to detect anomalous behavior indicative of exploitation. These measures go beyond generic advice by focusing on privilege restriction, proactive monitoring, and rapid patch deployment tailored to the specific nature of this kernel-level vulnerability.