CVE-2025-68968: Huawei HarmonyOS Use-After-Free Flaw

CVE-2025-68968 Overview

CVE-2025-68968 is a double free vulnerability affecting the multi-mode input module in Huawei HarmonyOS. This memory corruption flaw occurs when the same memory region is freed twice, potentially allowing attackers to corrupt memory structures, cause application crashes, or achieve arbitrary code execution. Successful exploitation of this vulnerability may compromise the input function and could lead to unauthorized access to system resources.

Critical Impact

Local attackers with low privileges can exploit this double free vulnerability to potentially execute arbitrary code or cause denial of service, affecting the confidentiality, integrity, and availability of HarmonyOS devices.

Affected Products

• Huawei HarmonyOS 6.0.0
• HarmonyOS devices with the multi-mode input module
• Huawei laptops running affected HarmonyOS versions

Discovery Timeline

• 2026-01-14 - CVE-2025-68968 published to NVD
• 2026-01-15 - Last updated in NVD database

Technical Details for CVE-2025-68968

Vulnerability Analysis

This vulnerability is classified as CWE-415 (Double Free), a memory corruption vulnerability that occurs when free() or a similar deallocation function is called more than once on the same memory address. The flaw resides within the multi-mode input module of HarmonyOS, which is responsible for handling various input mechanisms on Huawei devices.

When memory is freed twice, the heap management structures become corrupted. An attacker who can trigger this condition may be able to manipulate heap metadata to achieve write-what-where primitives, potentially leading to arbitrary code execution. The local attack vector requires the attacker to have some level of access to the target device, though only low privileges are needed to trigger the vulnerability.

The impact on the input function suggests that exploitation could occur through crafted input events or malformed data processed by the multi-mode input module. This could affect touchscreen input, keyboard input, or other input mechanisms supported by HarmonyOS.

Root Cause

The root cause of CVE-2025-68968 is improper memory management within the multi-mode input module. The vulnerability arises from a failure to properly track the allocation state of memory objects, leading to scenarios where a pointer to freed memory is dereferenced and freed again. This typically occurs due to:

• Missing or incorrect null pointer assignments after freeing memory
• Complex control flow paths where memory deallocation can occur multiple times
• Improper error handling that leads to duplicate cleanup operations
• Race conditions in multi-threaded code paths handling input events

Attack Vector

The attack vector for this vulnerability is local, meaning an attacker would need some form of access to the target HarmonyOS device. The exploitation scenario involves:

1. An attacker with low-privilege access to a HarmonyOS device identifies a code path that can trigger the double free condition
2. By sending specially crafted input or triggering specific sequences of operations, the attacker causes the multi-mode input module to free the same memory region twice
3. The corrupted heap state can then be leveraged to achieve further exploitation, potentially leading to privilege escalation or code execution

The vulnerability affects the input function, which could allow an attacker to intercept or manipulate user input, inject malicious commands, or gain elevated privileges on the system.

Detection Methods for CVE-2025-68968

Indicators of Compromise

• Unexpected crashes or restarts of the input service or system UI components
• Memory corruption errors in system logs related to the multi-mode input module
• Abnormal memory allocation patterns or heap corruption warnings
• Unusual process behavior following input-related operations

Detection Strategies

• Monitor system logs for heap corruption or double free error messages in HarmonyOS
• Implement memory sanitizer tools during development and testing to detect double free conditions
• Deploy runtime monitoring solutions that can detect heap metadata corruption
• Review crash dumps for signatures indicative of double free exploitation attempts

Monitoring Recommendations

• Enable verbose logging for input-related system services to capture anomalous behavior
• Implement application-level crash reporting to identify patterns that may indicate exploitation attempts
• Monitor for unusual privilege escalation events following input module activity
• Use endpoint detection and response (EDR) solutions capable of detecting memory corruption attacks

How to Mitigate CVE-2025-68968

Immediate Actions Required

• Apply the security patch provided by Huawei as soon as it becomes available for your device
• Restrict physical access to HarmonyOS devices where possible to limit local attack vectors
• Ensure devices are enrolled in automatic security update programs
• Review and limit installed applications to reduce potential attack surface

Patch Information

Huawei has addressed this vulnerability in their January 2026 security bulletin. Device owners should apply the latest security updates through the system settings or by visiting Huawei's official support channels. Refer to the Huawei Security Bulletin 2026-1 for mobile devices and the Huawei Laptop Security Bulletin 2026-1 for laptop devices for detailed patch information and update instructions.

Workarounds

• Limit the use of third-party input methods or applications that may interact with the multi-mode input module
• Monitor device behavior for signs of exploitation and report anomalies
• Implement device management policies that enforce timely security updates
• Consider network segmentation to isolate potentially vulnerable devices until patches are applied

# Check HarmonyOS version and security patch level
# Navigate to: Settings > About Device > Version
# Ensure the security patch level is January 2026 or later

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