CVE-2026-24929: Huawei HarmonyOS DoS Vulnerability

CVE-2026-24929 Overview

CVE-2026-24929 is an out-of-bounds read vulnerability affecting the graphics module in Huawei HarmonyOS. This memory safety flaw allows a local attacker with low privileges to read memory outside the intended buffer boundaries, potentially leading to information disclosure and system availability impacts.

Critical Impact

Successful exploitation of this vulnerability may affect system availability and expose sensitive memory contents on affected HarmonyOS devices.

Affected Products

• Huawei HarmonyOS 6.0.0
• HarmonyOS-based mobile devices
• HarmonyOS-based laptops and tablets

Discovery Timeline

• 2026-02-06 - CVE-2026-24929 published to NVD
• 2026-02-09 - Last updated in NVD database

Technical Details for CVE-2026-24929

Vulnerability Analysis

This vulnerability resides in the graphics module of HarmonyOS and is classified under CWE-125 (Out-of-Bounds Read) and CWE-476 (NULL Pointer Dereference). The flaw occurs when the graphics rendering subsystem fails to properly validate buffer boundaries during memory access operations, allowing read operations to extend beyond allocated memory regions.

The attack requires local access to the device, meaning an attacker must either have physical access or execute malicious code on the target system. The exploitation does not require user interaction, making it particularly concerning for scenarios where untrusted applications may be installed on the device.

Root Cause

The root cause stems from insufficient bounds checking in the graphics module's memory handling routines. When processing graphics data, the module fails to validate that read operations remain within the allocated buffer boundaries. This can lead to:

• Memory contents being read beyond intended boundaries
• Potential NULL pointer dereference conditions
• Information leakage from adjacent memory regions

Attack Vector

The vulnerability requires local access to exploit. An attacker with low-level privileges on a HarmonyOS device could craft malicious input to trigger the out-of-bounds read condition in the graphics module. This could be achieved through a malicious application that interacts with the graphics subsystem.

The local attack vector combined with low complexity requirements means that any application with graphics rendering capabilities could potentially be weaponized to exploit this vulnerability. The confidentiality and availability impacts, while limited in scope, could allow an attacker to leak sensitive memory contents or cause system instability.

Detection Methods for CVE-2026-24929

Indicators of Compromise

• Unexpected crashes or instability in graphics-related processes on HarmonyOS devices
• Anomalous memory access patterns logged by system debugging tools
• Applications making unusual graphics API calls with malformed parameters
• System log entries indicating memory boundary violations in graphics subsystem

Detection Strategies

• Monitor system logs for graphics module crashes or memory access violations
• Implement application behavior analysis to detect anomalous graphics API usage patterns
• Deploy endpoint detection solutions capable of identifying memory corruption attempts
• Review installed applications for suspicious graphics rendering behaviors

Monitoring Recommendations

• Enable verbose logging for the HarmonyOS graphics subsystem to capture potential exploitation attempts
• Implement real-time monitoring for process crashes related to graphics rendering
• Configure alerts for applications attempting to access restricted memory regions
• Regularly audit third-party applications installed on HarmonyOS devices

How to Mitigate CVE-2026-24929

Immediate Actions Required

• Update HarmonyOS devices to the latest security patch level as per Huawei's February 2026 security bulletin
• Restrict installation of applications from untrusted sources on affected devices
• Review and remove any suspicious or unnecessary third-party applications
• Enable automatic security updates to ensure timely patch deployment

Patch Information

Huawei has addressed this vulnerability in their February 2026 security bulletin. Affected users should update their devices to the latest available firmware version. For detailed patch information and update instructions, refer to the Huawei Security Bulletin 2026-2 for mobile devices or the Huawei Laptop Security Bulletin 2026-2 for laptop devices.

Workarounds

• Limit application installation to trusted sources such as Huawei AppGallery to reduce exposure to potentially malicious applications
• Avoid running applications with elevated privileges unless absolutely necessary
• Monitor device behavior for signs of graphics module instability and report anomalies
• Consider restricting graphics-intensive applications on sensitive devices until patches are applied

# Check current HarmonyOS version and security patch level
# Navigate to Settings > About phone > HarmonyOS version
# Ensure the security patch level is dated February 2026 or later

# Enable automatic updates (recommended)
# Settings > System & updates > Software update > Enable auto-download over Wi-Fi