CVE-2026-20445 Overview
CVE-2026-20445 is a race condition vulnerability affecting the MDDP (MediaTek Data Direct Path) component in Google Android devices utilizing MediaTek chipsets. The vulnerability exists due to improper synchronization in concurrent operations within the MDDP subsystem, which can lead to a system crash resulting in local denial of service.
Exploitation of this vulnerability requires that an attacker has already obtained System privileges on the affected device. Once these privileges are established, no user interaction is required to trigger the race condition and cause a denial of service condition.
Critical Impact
An attacker with System privileges can exploit this race condition to cause device crashes and denial of service across a wide range of MediaTek chipsets used in Android devices.
Affected Products
- Google Android 14.0, 15.0, and 16.0
- MediaTek MT6835, MT6855, MT6878, MT6879, MT6883, MT6885
- MediaTek MT6886, MT6889, MT6893, MT6895, MT6897, MT6899
- MediaTek MT6983, MT6985, MT6989, MT6991, MT6993
- MediaTek MT8188, MT8678, MT8755, MT8771, MT8797, MT8798
Discovery Timeline
- March 2, 2026 - CVE-2026-20445 published to NVD
- March 3, 2026 - Last updated in NVD database
Technical Details for CVE-2026-20445
Vulnerability Analysis
This vulnerability is classified under CWE-367 (Time-of-Check Time-of-Use Race Condition). The MDDP component in MediaTek chipsets handles data path operations that require careful synchronization between concurrent threads or processes. When proper locking mechanisms are not implemented or are incorrectly applied, a race condition can occur where the state of a resource changes between the time it is checked and the time it is used.
The race condition in MDDP can be exploited by a privileged attacker who has already gained System-level access to the device. By triggering specific timing conditions within the MDDP subsystem, the attacker can cause memory corruption or state inconsistency that leads to a kernel panic or system crash. While this does not allow code execution or data theft, it effectively renders the device unusable until rebooted, creating a denial of service condition.
The broad range of affected MediaTek chipsets indicates that the vulnerable code is shared across multiple product lines, including mobile SoCs (MT68xx series) and tablet/IoT chipsets (MT8xxx series).
Root Cause
The root cause of CVE-2026-20445 is a Time-of-Check Time-of-Use (TOCTOU) race condition in the MDDP component. This occurs when the system checks the state or validity of a resource, and then uses that resource in a subsequent operation without adequate protection against concurrent modifications. Between the check and the use, another thread or process may alter the resource, causing undefined behavior.
In this case, the MDDP data path operations likely involve shared memory structures or kernel objects that are accessed without proper mutex locks or memory barriers, allowing concurrent access to corrupt the expected state and trigger a crash.
Attack Vector
The attack vector involves an attacker who has already compromised the device with System-level privileges. From this elevated position, the attacker can manipulate the timing of MDDP operations to trigger the race condition. This may involve:
- Creating multiple concurrent requests to MDDP functions
- Timing operations to maximize the window between check and use
- Exploiting kernel interfaces to access MDDP functionality
The vulnerability is exploitable over the network from a privileged position, though the high complexity required for successful exploitation reduces the practical risk. No user interaction is required once the attacker has established System privileges.
The specific exploitation technique involves timing concurrent MDDP operations to trigger state inconsistency. Detailed technical analysis is available in the MediaTek Product Security Bulletin.
Detection Methods for CVE-2026-20445
Indicators of Compromise
- Unexpected system reboots or kernel panics on devices with MediaTek chipsets
- Crash logs referencing MDDP-related kernel modules or functions
- Unusual patterns of privileged process activity targeting MDDP interfaces
- System stability issues correlating with network activity
Detection Strategies
- Monitor kernel logs for crash signatures involving MDDP components using dmesg or centralized logging solutions
- Implement anomaly detection for System-privileged processes making unusual syscalls to MediaTek driver interfaces
- Deploy endpoint detection solutions capable of monitoring kernel-level activity on Android devices
- Analyze crash dumps for TOCTOU race condition patterns in the MDDP subsystem
Monitoring Recommendations
- Enable verbose kernel logging on managed Android devices to capture MDDP-related events
- Configure crash reporting infrastructure to alert on patterns consistent with this vulnerability
- Monitor for privilege escalation attempts that could be precursors to exploiting this vulnerability
- Track device firmware and security patch levels to identify unpatched systems
How to Mitigate CVE-2026-20445
Immediate Actions Required
- Apply the March 2026 Android security patch containing fix ALPS10289875 to all affected devices
- Prioritize patching for devices in high-security environments or those exposed to potential compromise
- Audit devices with MediaTek chipsets to identify which require updates
- Implement mobile device management (MDM) policies to enforce security updates
Patch Information
MediaTek has released a patch identified as ALPS10289875 (Issue ID: MSV-5184) to address this vulnerability. The fix is included in the March 2026 security update for Android. Device manufacturers and OEMs should integrate this patch into their firmware updates. End users should apply the latest security updates from their device manufacturer or carrier.
For detailed patch information, refer to the MediaTek Product Security Bulletin.
Workarounds
- Implement strong access controls to prevent unauthorized escalation to System privileges, reducing the attack surface
- Deploy application sandboxing and SELinux policies to limit the ability of compromised apps to reach System-level access
- Use mobile threat defense (MTD) solutions to detect and respond to privilege escalation attempts
- Consider network segmentation for devices that cannot be immediately patched to limit potential attack vectors
# Verify Android security patch level on affected devices
adb shell getprop ro.build.version.security_patch
# Expected output should show 2026-03-01 or later for patched devices
# Check for MediaTek chipset identification
adb shell cat /proc/cpuinfo | grep Hardware
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
