CVE-2026-24930: Huawei HarmonyOS Use-After-Free Vulnerability

CVE-2026-24930 Overview

CVE-2026-24930 is a Use-After-Free (UAF) concurrency vulnerability affecting the graphics module in Huawei HarmonyOS. This race condition vulnerability allows a local attacker with low privileges to trigger memory corruption through improper synchronization of concurrent operations, potentially leading to system instability and denial of service conditions.

Critical Impact

Successful exploitation of this vulnerability may affect system availability, enabling attackers to crash graphics-related processes or cause system instability on affected HarmonyOS devices.

Affected Products

• Huawei HarmonyOS 5.1.0
• Huawei HarmonyOS 6.0.0
• Huawei Laptops running affected HarmonyOS versions

Discovery Timeline

• February 6, 2026 - CVE-2026-24930 published to NVD
• February 9, 2026 - Last updated in NVD database

Technical Details for CVE-2026-24930

Vulnerability Analysis

This vulnerability combines two dangerous weakness classes: CWE-362 (Race Condition) and CWE-416 (Use After Free). The graphics module in HarmonyOS fails to properly synchronize concurrent access to memory resources, creating a window where freed memory can be accessed by another thread before proper reallocation or nullification occurs.

The local attack vector requires the attacker to have low-privilege access to the device. No user interaction is required for exploitation, and successful attacks do not impact data confidentiality or integrity—however, system availability can be significantly impaired.

Root Cause

The root cause lies in improper concurrency handling within the HarmonyOS graphics module. When multiple threads interact with shared graphics resources simultaneously, a race condition occurs where one thread may free a memory object while another thread still holds a reference to it. This Time-of-Check Time-of-Use (TOCTOU) pattern allows the second thread to subsequently access the freed memory, triggering undefined behavior.

The lack of proper mutex locks, memory barriers, or atomic operations around critical sections in the graphics pipeline enables this race condition to manifest.

Attack Vector

Exploitation requires local access to a HarmonyOS device with low-privilege credentials. An attacker could craft a malicious application or execute code that rapidly performs graphics operations designed to trigger the race condition.

The attack sequence involves:

1. Identifying graphics operations that can be parallelized
2. Creating multiple threads that concurrently access shared graphics resources
3. Timing the operations to maximize the probability of hitting the UAF window
4. Triggering memory access to the freed object, causing a crash

Since no verified code examples are available for this vulnerability, technical details about the specific exploitation method should be reviewed in the Huawei Security Bulletin for authoritative information.

Detection Methods for CVE-2026-24930

Indicators of Compromise

• Unexpected crashes or restarts of graphics-related system services on HarmonyOS devices
• System log entries indicating memory access violations or segmentation faults in graphics modules
• Application crashes occurring during intensive graphics operations
• Elevated frequency of SIGSEGV or SIGBUS signals in system logs

Detection Strategies

• Monitor system logs for repeated crashes in graphics subsystem components
• Implement application-level crash reporting to identify patterns consistent with UAF exploitation
• Deploy endpoint detection solutions capable of identifying race condition exploitation attempts
• Review installed applications for suspicious behavior patterns involving rapid graphics API calls

Monitoring Recommendations

• Enable verbose logging for HarmonyOS graphics subsystem components
• Configure alerting for abnormal process termination rates
• Monitor device stability metrics and correlation with specific application usage
• Implement SentinelOne Singularity for real-time behavioral analysis and threat detection on supported endpoints

How to Mitigate CVE-2026-24930

Immediate Actions Required

• Update all affected Huawei HarmonyOS devices to the latest security patch level
• Review the Huawei Security Bulletin for February 2026 for official guidance
• Restrict installation of untrusted applications that could exploit this vulnerability
• Monitor affected devices for signs of exploitation until patches are applied

Patch Information

Huawei has addressed this vulnerability in their February 2026 security bulletin. Affected users should apply the latest security updates available through:

• Huawei Security Bulletin - For mobile devices running HarmonyOS
• Huawei Laptops Security Bulletin - For laptop devices running HarmonyOS

Organizations should prioritize deployment of these patches across all affected HarmonyOS 5.1.0 and 6.0.0 devices.

Workarounds

• Limit installation of third-party applications to trusted sources only until patches are applied
• Restrict local user access on shared devices to minimize attack surface
• Consider isolating unpatched devices from sensitive network segments
• Implement application allowlisting to prevent execution of unauthorized code

# Verify HarmonyOS version and security patch level
# Navigate to: Settings > About device > Version information
# Ensure security patch level is dated February 2026 or later
# Enable automatic system updates to receive future security patches