CVE-2026-21123 in Samsung
Summary
by MITRE • 10/12/2026
Improper privilege management in Locksettings prior to SMR Oct-2026 Release 1 allows local privileged attackers with root privilege to access data of the tied profile in before first unlock.
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Analysis
by VulDB Data Team • 10/12/2026
The vulnerability identified as an improper privilege management flaw within the Locksettings component, specifically affecting versions prior to the SMR October 2026 Release 1, represents a critical security deficiency in how sensitive user data is protected during the device initialization and authentication phases. This issue stems from inadequate access control mechanisms that fail to properly restrict read operations on profile-specific data before the system has completed its primary unlocking sequence. In modern mobile operating systems, particularly those adhering to Android Security Model standards, the lock screen serves as a critical boundary between untrusted state and trusted user interaction. Data associated with tied profiles, such as work or school accounts managed via Enterprise Device Policy Controllers, contains highly sensitive information including credentials, corporate emails, and proprietary documents that must remain encrypted and inaccessible until the user has successfully authenticated themselves through biometrics, PIN, password, or pattern.
The technical nature of this flaw involves a race condition or logic error in the initialization sequence where the system exposes data handles for tied profiles to processes running with root privileges before the first unlock event occurs. Typically, when a device is powered on or rebooted into an unlocked state from sleep, there is a brief window between boot completion and user authentication during which certain background services initialize. If these services inadvertently retain access tokens or file descriptors pointing to encrypted profile data without verifying that the primary lock screen has been bypassed by the legitimate owner, local attackers with root privileges can exploit this gap. Root access allows an attacker to execute commands at the highest level of system authority, effectively allowing them to read raw memory segments or decrypt files intended only for post-authentication consumption. This violates the principle of least privilege and fails to enforce strict separation between pre-unlock and post-unlock security contexts.
The operational impact of this vulnerability is severe, as it allows a local attacker who has already achieved root access to exfiltrate data from tied profiles without triggering standard lock screen protections or requiring additional authentication steps. This scenario typically arises in environments where device management policies are enforced but the underlying OS implementation contains flaws that undermine those policies. An adversary with physical access and the ability to gain temporary root privileges, perhaps through a previously unpatched kernel exploit or via compromised developer tools, could extract sensitive corporate data before the user even interacts with the device. This undermines trust in enterprise mobility management solutions and poses significant risks for organizations relying on these devices for secure communications and data storage. The exposure of tied profile data effectively bypasses encryption-at-rest protections that are designed to activate only after successful authentication, rendering those safeguards ineffective during this specific window of vulnerability.
Mitigation strategies primarily involve applying the vendor-provided security patch included in SMR October 2026 Release 1 or later versions, which corrects the privilege escalation logic within Locksettings. Until such updates are deployed, administrators should ensure that devices are kept under strict physical control to prevent unauthorized access attempts and that root privileges are rigorously restricted through device policy configurations where possible. Additionally, implementing robust monitoring for unusual file system accesses during boot sequences can help detect exploitation attempts in real-time. Security teams must also verify that all tied profiles have strong authentication methods enabled, although this does not fully mitigate the risk given the pre-unlock nature of the flaw. Regular audits of security patches and adherence to recommended update schedules are essential to closing these gaps before they can be leveraged by malicious actors seeking to compromise sensitive organizational data.