CVE-2025-52519: Samsung Exynos Information Disclosure Flaw

CVE-2025-52519 Overview

A high-severity improper input validation vulnerability has been discovered in the Camera subsystem of Samsung Mobile and Wearable Processor Exynos chipsets. The vulnerability exists in the issimian device driver, which fails to properly validate user-space input. This flaw can be exploited by a local attacker with low privileges to trigger information disclosure and denial of service conditions on affected devices.

Critical Impact

Local attackers can exploit improper input validation in the Samsung Exynos camera driver to leak sensitive information and crash affected devices, potentially impacting device availability and confidentiality.

Affected Products

• Samsung Mobile Processor Exynos 1330
• Samsung Mobile Processor Exynos 1380
• Samsung Mobile Processor Exynos 1480
• Samsung Mobile Processor Exynos 2400
• Samsung Wearable Processor Exynos 1580
• Samsung Wearable Processor Exynos 2500

Discovery Timeline

• 2026-01-05 - CVE-2025-52519 published to NVD
• 2026-01-08 - Last updated in NVD database

Technical Details for CVE-2025-52519

Vulnerability Analysis

This vulnerability is classified under CWE-20 (Improper Input Validation) and affects the issimian device driver within the Camera subsystem of Samsung Exynos processors. The driver fails to adequately validate data received from user-space applications before processing it, creating a security boundary violation between user-space and kernel-space operations.

When user-supplied input is passed to the vulnerable driver without proper validation, an attacker can craft malicious input that causes the driver to behave unexpectedly. This can result in two distinct impacts: information disclosure, where sensitive kernel or device memory contents may be leaked to the attacker, and denial of service, where the improper handling of malformed input causes the driver or device subsystem to crash or become unresponsive.

The local attack vector requires the attacker to have some level of access to the device, though only low privileges are needed to exploit the vulnerability. No user interaction is required for successful exploitation.

Root Cause

The root cause of this vulnerability lies in insufficient input validation routines within the issimian device driver. When the driver receives data from user-space applications through its interface, it processes this data without performing adequate boundary checks, type validation, or sanitization. This allows malformed or malicious input to reach internal driver functions that assume input has already been validated, leading to undefined behavior, memory disclosure, or crash conditions.

Attack Vector

The attack requires local access to a device containing a vulnerable Samsung Exynos processor. An attacker with low-privilege access to the system can interact with the issimian device driver interface, typically exposed through device nodes in /dev/ or through camera-related system calls. By crafting specially formatted input that bypasses or exploits the weak validation logic, the attacker can:

1. Trigger memory reads beyond intended boundaries, leaking kernel memory contents
2. Cause the driver to enter an error state, resulting in a denial of service condition
3. Potentially crash the camera subsystem or the entire device

The attack does not require user interaction and can be performed programmatically once the attacker has local access to the device.

Detection Methods for CVE-2025-52519

Indicators of Compromise

• Unexpected crashes or restarts of the camera application or camera subsystem
• Kernel panic or oops messages referencing the issimian driver in system logs
• Unusual memory access patterns or segmentation faults related to camera device operations
• Repeated attempts to access camera device nodes from low-privilege processes

Detection Strategies

• Monitor kernel logs (dmesg, /var/log/kern.log) for errors or warnings associated with the issimian driver
• Implement anomaly detection for unusual ioctl calls or device node access patterns targeting camera drivers
• Deploy endpoint detection solutions capable of monitoring kernel driver interactions
• Enable SELinux/Android security policies that restrict access to camera device nodes

Monitoring Recommendations

• Enable verbose logging for camera subsystem and device driver operations
• Configure security information and event management (SIEM) to alert on repeated camera driver failures
• Monitor for new or unusual processes attempting to access camera device interfaces
• Review device firmware update status to ensure patches are applied promptly

How to Mitigate CVE-2025-52519

Immediate Actions Required

• Apply the latest firmware updates from Samsung that address this vulnerability
• Restrict physical access to affected devices to reduce local attack surface
• Review and enforce strict SELinux/Android security policies to limit access to camera device drivers
• Monitor affected devices for signs of exploitation until patches can be applied

Patch Information

Samsung has released security updates addressing this vulnerability. Administrators and users should consult the Samsung Security Updates page and the Samsung CVE-2025-52519 Advisory for detailed patch information and firmware update instructions specific to their device and processor model.

Workarounds

• Limit camera functionality on affected devices until patches are applied, if operationally feasible
• Implement additional access controls to restrict which applications can interact with camera device drivers
• Deploy mobile device management (MDM) policies to enforce security configurations on enterprise devices
• Consider temporarily disabling or restricting access to camera features on high-risk deployments until remediation is complete