CVE-2025-48535 is a vulnerability identified in Google Android operating system versions 13 through 16, specifically within the assertSafeToStartCustomActivity method of the AppRestrictionsFragment.java component. The root cause is unsafe deserialization, classified under CWE-502, where a parcel mismatch can be exploited. Parcels are Android's mechanism for marshaling and unmarshaling data across processes. Improper validation during deserialization allows an attacker to manipulate parcel data, leading to a 'launch anywhere' condition. This means an attacker can start arbitrary activities or components with escalated privileges. The exploit requires only local access with limited privileges and does not require user interaction, making it easier to automate or execute stealthily. The vulnerability affects confidentiality, integrity, and availability, as an attacker can gain unauthorized access and control over system components. The CVSS v3.1 score is 7.8, indicating high severity with attack vector local, low attack complexity, low privileges required, no user interaction, and full impact on confidentiality, integrity, and availability. No patches or known exploits are currently reported, but the vulnerability is publicly disclosed and should be addressed promptly. The lack of user interaction and low privilege requirements increase the risk of exploitation in environments where local access is possible, such as shared devices or multi-user systems.

The impact of CVE-2025-48535 is significant for organizations relying on Android devices, especially those running versions 13 to 16. An attacker with local access can escalate privileges without needing additional execution rights or user interaction, potentially gaining full control over the device. This can lead to unauthorized access to sensitive data, manipulation or deletion of critical information, and disruption of device functionality. In enterprise environments, compromised devices can serve as entry points for lateral movement, data exfiltration, or deployment of further malware. The vulnerability undermines the security model of Android's application sandboxing and permission system, increasing the risk of insider threats or attacks from malicious applications with limited privileges. The absence of known exploits in the wild currently reduces immediate risk but does not eliminate the threat, as proof-of-concept exploits could emerge. Organizations with BYOD policies, mobile workforce, or critical mobile infrastructure are particularly vulnerable. The widespread use of Android globally amplifies the potential scale of impact.

1. Apply official security patches from Google as soon as they become available for affected Android versions (13 to 16). 2. Until patches are released, restrict local access to devices by enforcing strong physical security controls and device lock policies. 3. Limit installation of untrusted or third-party applications to reduce the risk of local privilege escalation via malicious apps. 4. Employ mobile device management (MDM) solutions to monitor device behavior and detect anomalous activity indicative of exploitation attempts. 5. Use application sandboxing and permission management to minimize the privileges granted to apps, reducing the attack surface. 6. Educate users on the risks of sideloading applications and the importance of maintaining device security hygiene. 7. For high-security environments, consider disabling features or components related to AppRestrictionsFragment if feasible, or implement runtime monitoring for suspicious parcel deserialization activities. 8. Conduct regular security audits and penetration testing focused on local privilege escalation vectors to identify and remediate weaknesses proactively.