CVE-2026-20411: Google Android Privilege Escalation Flaw

CVE-2026-20411 Overview

CVE-2026-20411 is a use after free vulnerability in the MediaTek camera ISP (Image Signal Processor) driver affecting Google Android devices running on multiple MediaTek chipsets. The vulnerability exists in the cameraisp component and can be exploited by an attacker who has already obtained System privileges to cause a denial of service condition or potentially escalate privileges further. No user interaction is required for exploitation.

This vulnerability affects a wide range of MediaTek processors including the MT6800 and MT8000 series, commonly found in Android smartphones, tablets, and IoT devices. The flaw stems from improper memory management in the camera ISP kernel driver, where memory is accessed after being freed.

Critical Impact

Local privilege escalation via use after free in MediaTek camera ISP driver affecting Android 13.0 through 16.0 on numerous MediaTek chipsets.

Affected Products

• Google Android 13.0, 14.0, 15.0, and 16.0
• MediaTek MT6878, MT6879, MT6881, MT6886, MT6895, MT6897, MT6899
• MediaTek MT6983, MT6985, MT6989, MT6991, MT6993
• MediaTek MT8168, MT8188, MT8195, MT8365, MT8370, MT8390, MT8395
• MediaTek MT8666, MT8667, MT8673, MT8676, MT8793

Discovery Timeline

• February 2, 2026 - CVE-2026-20411 published to NVD
• February 4, 2026 - Last updated in NVD database

Technical Details for CVE-2026-20411

Vulnerability Analysis

This vulnerability is classified as CWE-416 (Use After Free), a memory corruption vulnerability that occurs when a program continues to use a pointer after the memory it references has been freed. In the context of the MediaTek camera ISP driver, this creates a condition where freed memory regions can be manipulated by an attacker.

The vulnerability requires local access and low-privilege authentication to exploit, though the attacker must have already obtained System privileges on the device. The impact is significant as successful exploitation can affect confidentiality, integrity, and availability of the system, potentially allowing an attacker with System privileges to further escalate privileges or cause denial of service.

Root Cause

The root cause of CVE-2026-20411 lies in improper lifecycle management of memory objects within the cameraisp kernel driver. The driver fails to properly invalidate pointers after freeing associated memory structures, leaving dangling pointers that can be dereferenced in subsequent operations.

This type of vulnerability commonly occurs in kernel drivers when:

• Memory objects are freed but references to them are retained
• Race conditions allow access to freed memory between deallocation and pointer invalidation
• Complex object relationships make memory ownership unclear

The vulnerability is tracked internally by MediaTek as Patch ID: ALPS10351676 and Issue ID: MSV-5737.

Attack Vector

The attack vector is local, meaning an attacker must already have code execution capability on the target device. The exploitation flow involves:

1. An attacker with System privileges on an affected Android device triggers the camera ISP driver to allocate memory objects
2. The attacker induces a condition where memory is freed while references still exist
3. By carefully controlling subsequent memory allocations, the attacker can place controlled data in the freed memory region
4. When the driver accesses the dangling pointer, it operates on attacker-controlled data
5. This can lead to arbitrary code execution in kernel context or denial of service

The vulnerability does not require user interaction, meaning it can be triggered programmatically once initial system access is achieved. The complexity of exploitation is considered low once the prerequisites are met.

Detection Methods for CVE-2026-20411

Indicators of Compromise

• Unexpected camera ISP driver crashes or kernel panics related to cameraisp modules
• Anomalous memory access patterns in camera-related kernel drivers
• System instability or repeated reboots following camera application usage
• Suspicious processes attempting to interact with camera ISP driver interfaces with elevated privileges

Detection Strategies

• Monitor kernel logs for use after free errors or memory corruption indicators in camera ISP components
• Implement runtime memory safety checks using kernel address sanitizer (KASAN) in development environments
• Deploy endpoint detection solutions capable of monitoring kernel driver behavior for anomalous memory operations
• Review system logs for suspicious privilege escalation attempts following camera driver interactions

Monitoring Recommendations

• Enable comprehensive kernel logging on Android devices in enterprise environments
• Monitor for unusual camera driver initialization patterns or repeated driver loads/unloads
• Implement alerting for kernel oops or panics originating from MediaTek ISP driver modules
• Track firmware and kernel module versions across managed device fleets to identify vulnerable systems

How to Mitigate CVE-2026-20411

Immediate Actions Required

• Apply the MediaTek security patch (ALPS10351676) through OEM firmware updates as soon as available
• Update affected Android devices to the latest available security patch level
• Restrict physical access to affected devices to minimize local attack surface
• Monitor devices for signs of compromise until patches can be applied

Patch Information

MediaTek has released a security patch addressing this vulnerability in their February 2026 Security Bulletin. The patch is identified as ALPS10351676 and addresses the use after free condition in the camera ISP driver.

Device manufacturers using affected MediaTek chipsets should integrate this patch into their firmware updates. End users should apply OEM firmware updates or Android security patches when they become available for their specific device models.

Workarounds

• Limit the installation of applications that require camera access to trusted sources only
• Consider disabling or restricting camera functionality through device management policies on enterprise devices until patches are applied
• Implement application-level restrictions to prevent untrusted code from interacting with camera subsystems
• Deploy mobile threat defense solutions capable of detecting exploitation attempts on managed devices

# Verify Android Security Patch Level
adb shell getprop ro.build.version.security_patch

# Check for MediaTek chipset information
adb shell cat /proc/cpuinfo | grep Hardware

# Review kernel logs for camera ISP errors
adb shell dmesg | grep -i cameraisp