CVE-2026-24922: Huawei HarmonyOS Buffer Overflow Flaw

CVE-2026-24922 Overview

CVE-2026-24922 is a buffer overflow vulnerability discovered in the HDC (HarmonyOS Device Connector) module of Huawei's HarmonyOS operating system. This heap-based buffer overflow (CWE-122) stems from improper bounds checking during buffer operations, allowing a local attacker with low privileges to trigger memory corruption that impacts system availability.

The vulnerability affects devices running HarmonyOS 6.0.0 and requires local access to exploit. When successfully exploited, attackers can cause denial of service conditions by crashing affected system components or the entire device.

Critical Impact

Local attackers with low privileges can exploit this buffer overflow to cause system instability and denial of service on affected HarmonyOS devices.

Affected Products

• Huawei HarmonyOS 6.0.0
• Huawei Laptops running HarmonyOS
• Huawei Wearables running HarmonyOS

Discovery Timeline

• 2026-02-06 - CVE-2026-24922 published to NVD
• 2026-02-10 - Last updated in NVD database

Technical Details for CVE-2026-24922

Vulnerability Analysis

This vulnerability is classified under CWE-122 (Heap-based Buffer Overflow) and CWE-120 (Buffer Copy without Checking Size of Input), indicating that the HDC module fails to properly validate buffer boundaries when handling data operations. The HDC module is a critical system component in HarmonyOS responsible for device connectivity and communication functions.

The local attack vector means an attacker must have some level of access to the target device to exploit this vulnerability. The impact is limited to availability, meaning successful exploitation will not compromise the confidentiality or integrity of data on the system. However, the high availability impact indicates that exploitation can cause significant disruption to device operations, potentially requiring a device restart to restore normal functionality.

Root Cause

The root cause of CVE-2026-24922 lies in insufficient bounds checking within the HDC module's buffer handling routines. When the module processes input data, it fails to verify that the data size does not exceed the allocated buffer capacity before performing copy operations. This classic buffer overflow pattern allows data to overflow into adjacent memory regions on the heap, corrupting memory structures and leading to system instability.

Attack Vector

The attack requires local access to the HarmonyOS device with low-level privileges. An attacker can craft malicious input that, when processed by the HDC module, exceeds buffer boundaries and overwrites adjacent heap memory. The exploitation does not require user interaction, making it easier to trigger once an attacker has local access.

The vulnerability can be exploited by:

1. Gaining local access to a vulnerable HarmonyOS device
2. Crafting input data that exceeds expected buffer sizes
3. Submitting the malicious input to the HDC module
4. Triggering memory corruption that crashes the affected component

For technical details on the vulnerability mechanism, refer to the Huawei Consumer Security Bulletin.

Detection Methods for CVE-2026-24922

Indicators of Compromise

• Unexpected crashes or restarts of HarmonyOS system services
• Application crashes related to HDC module operations
• System instability or unresponsive device behavior
• Error logs indicating memory corruption or heap overflow conditions

Detection Strategies

• Monitor system logs for HDC module crash events or memory-related errors
• Implement endpoint detection solutions capable of identifying buffer overflow exploitation attempts
• Use SentinelOne's behavioral AI to detect anomalous memory access patterns indicative of exploitation
• Deploy runtime application self-protection (RASP) mechanisms where applicable

Monitoring Recommendations

• Enable verbose logging for HarmonyOS system components to capture crash diagnostics
• Monitor device health metrics for unusual patterns of service restarts
• Implement centralized log collection for HarmonyOS devices in enterprise environments
• Establish baseline behavior for HDC module operations to detect deviations

How to Mitigate CVE-2026-24922

Immediate Actions Required

• Update all affected HarmonyOS devices to the latest firmware version that includes the security patch
• Review device access controls to minimize local access where possible
• Prioritize patching for devices in high-risk environments or with sensitive data
• Monitor Huawei security bulletins for additional guidance and updates

Patch Information

Huawei has released security updates addressing this vulnerability in their February 2026 security bulletins. Device administrators should consult the appropriate bulletin based on their device type:

• Huawei Consumer Security Bulletin - For smartphones and tablets
• Huawei Laptops Security Bulletin - For laptop devices
• Huawei Wearables Security Bulletin - For wearable devices

Apply updates through the device's system update mechanism or via enterprise MDM solutions for managed device deployments.

Workarounds

• Restrict physical and local access to HarmonyOS devices until patches can be applied
• Implement network segmentation to limit lateral movement in case of device compromise
• Use mobile device management (MDM) solutions to enforce security policies and monitor device health
• Consider temporarily disabling non-essential HDC module functionality if supported by your deployment

# Check HarmonyOS version to determine patch status
# Navigate to Settings > About Device > Version
# Ensure security patch level is dated February 2026 or later

# For enterprise deployments, use MDM to query device security patch levels
# and enforce compliance with updated firmware requirements