CVE-2026-20977: Samsung Android Privilege Escalation Flaw

CVE-2026-20977 Overview

CVE-2026-20977 is an improper access control vulnerability in the Emergency Sharing feature of Samsung Android devices. This security flaw exists in Samsung Android versions prior to the SMR Feb-2026 Release 1 and allows local attackers to interrupt the functioning of the Emergency Sharing feature. The vulnerability affects a critical safety feature designed to help users share their location and status during emergencies.

Critical Impact

Local attackers can disrupt the Emergency Sharing functionality on Samsung devices, potentially preventing users from utilizing this safety feature during critical situations when they need to alert contacts or share their location.

Affected Products

• Samsung Android 14.0 (all SMR releases prior to Feb-2026 Release 1)
• Samsung Android 15.0 (all SMR releases prior to Feb-2026 Release 1)
• Samsung Android 16.0 (all SMR releases prior to Feb-2026 Release 1)

Discovery Timeline

• February 4, 2026 - CVE-2026-20977 published to NVD
• February 5, 2026 - Last updated in NVD database

Technical Details for CVE-2026-20977

Vulnerability Analysis

This vulnerability stems from improper access control mechanisms within Samsung's Emergency Sharing component. The Emergency Sharing feature is a safety-critical function that allows users to quickly share their location and status with designated contacts during emergency situations. Due to insufficient access control validation, a local attacker with access to the device can interfere with this feature's normal operation.

The attack requires local access to the device, meaning an attacker must either have physical access or have already compromised the device through other means such as malicious applications. While no privileges are required to exploit this vulnerability, the impact is limited to availability disruption of the Emergency Sharing feature rather than data confidentiality or integrity breaches.

Root Cause

The root cause of CVE-2026-20977 is improper access control implementation in the Emergency Sharing component of Samsung Android. The feature fails to properly validate or restrict access from unauthorized local processes or applications, allowing them to interfere with its operation. This represents a failure in the access control design where the component does not adequately protect its interfaces from local manipulation.

Attack Vector

The attack vector for this vulnerability is local, requiring the attacker to have some form of access to the target device. Exploitation does not require any special privileges or user interaction, making it relatively straightforward for an attacker who has already gained local access. The attack could potentially be carried out by a malicious application installed on the device or by an attacker with physical access.

A successful exploitation results in denial of service to the Emergency Sharing feature. This could be particularly dangerous in scenarios where a user is attempting to use this safety feature during an actual emergency, as the attacker could prevent the device from sharing location or status information with emergency contacts.

Detection Methods for CVE-2026-20977

Indicators of Compromise

• Unexpected failures or crashes of the Emergency Sharing feature when attempting to use it
• Unusual application behavior or processes interacting with Emergency Sharing system components
• System logs showing abnormal access attempts to Emergency Sharing related services

Detection Strategies

• Monitor device logs for unusual activity related to Emergency Sharing service interruptions
• Implement mobile device management (MDM) solutions to detect anomalous application behavior
• Review installed applications for suspicious permissions or behaviors that could indicate malicious intent

Monitoring Recommendations

• Enable comprehensive logging on Samsung devices managed within enterprise environments
• Use SentinelOne Mobile Threat Defense to detect and prevent malicious applications that could exploit this vulnerability
• Regularly audit device security status through Samsung Knox or enterprise MDM solutions

How to Mitigate CVE-2026-20977

Immediate Actions Required

• Update all affected Samsung devices to SMR Feb-2026 Release 1 or later immediately
• Review and remove any untrusted or suspicious applications from affected devices
• Enable Samsung Knox security features if available on enterprise-managed devices
• Restrict installation of applications from unknown sources

Patch Information

Samsung has addressed this vulnerability in the SMR Feb-2026 Release 1 security update. The patch implements proper access control mechanisms to prevent unauthorized local processes from interfering with the Emergency Sharing feature. Detailed patch information is available in the Samsung Mobile Security Update for February 2026.

Organizations should prioritize deployment of this security update, particularly for devices used by personnel in safety-critical roles or environments where the Emergency Sharing feature may be relied upon.

Workarounds

• Limit physical access to affected devices until patches can be applied
• Remove or disable untrusted applications that could potentially exploit this vulnerability
• Consider using alternative emergency contact methods until the device is patched
• Implement application allowlisting through enterprise MDM solutions to prevent installation of potentially malicious apps