CVE-2026-24928: Huawei EMUI Buffer Overflow Vulnerability

CVE-2026-24928 Overview

CVE-2026-24928 is an out-of-bounds write vulnerability affecting the file system module in Huawei EMUI and HarmonyOS operating systems. This memory corruption flaw occurs when the file system module fails to properly validate buffer boundaries during write operations, potentially allowing an attacker with local access to exploit the vulnerability and compromise service confidentiality.

The vulnerability is classified under CWE-787 (Out-of-bounds Write) and CWE-680 (Integer Overflow to Buffer Overflow), indicating that improper memory handling in the file system component can lead to writing data beyond allocated buffer boundaries. Successful exploitation requires local access to the device but does not require user interaction.

Critical Impact

Local attackers can exploit this out-of-bounds write vulnerability to potentially access confidential information on affected Huawei devices running EMUI 14.2.0 or HarmonyOS 4.2.0.

Affected Products

• Huawei EMUI 14.2.0
• Huawei HarmonyOS 4.2.0

Discovery Timeline

• 2026-02-06 - CVE-2026-24928 published to NVD
• 2026-02-09 - Last updated in NVD database

Technical Details for CVE-2026-24928

Vulnerability Analysis

This out-of-bounds write vulnerability resides in the file system module of Huawei's mobile operating systems. The flaw allows data to be written beyond the boundaries of an allocated memory buffer, which can corrupt adjacent memory regions. While the primary impact noted by Huawei is confidentiality-related, out-of-bounds write vulnerabilities can potentially lead to more severe consequences depending on what memory regions are affected.

The vulnerability requires local access to the device (the attacker must have some level of access to the affected system) and low privileges to exploit. No user interaction is required for exploitation, making it easier for a local attacker to leverage if they already have a foothold on the device.

Root Cause

The root cause of CVE-2026-24928 stems from improper bounds checking in the file system module during write operations. When processing certain file system operations, the module fails to adequately validate the size of data being written against the allocated buffer capacity. The association with CWE-680 (Integer Overflow to Buffer Overflow) suggests that an integer overflow condition may occur during size calculations, resulting in an undersized buffer allocation that is subsequently overwritten.

Attack Vector

The attack vector for this vulnerability is local, meaning an attacker needs existing access to the device to exploit the flaw. The exploitation scenario involves:

1. An attacker with local access and low-level privileges on a vulnerable Huawei device
2. Triggering specific file system operations that invoke the vulnerable code path
3. Exploiting the improper boundary validation to write data beyond buffer limits
4. Potentially accessing confidential information stored in adjacent memory regions

The vulnerability does not require user interaction, which means a malicious application or local attacker could potentially exploit it without the device owner's knowledge. For technical details on the vulnerability mechanism, refer to the Huawei Security Bulletin.

Detection Methods for CVE-2026-24928

Indicators of Compromise

• Unexpected file system module crashes or errors in system logs
• Anomalous memory access patterns in file system operations
• Unusual process behavior related to file system components
• Application crashes with memory-related error codes

Detection Strategies

• Monitor system logs for file system module errors or abnormal terminations
• Implement application integrity monitoring to detect unauthorized modifications
• Deploy mobile threat detection solutions capable of identifying exploitation attempts
• Review device security audit logs for suspicious local access patterns

Monitoring Recommendations

• Enable verbose logging for file system operations where available
• Configure alerts for abnormal memory consumption by system processes
• Regularly audit installed applications for potentially malicious behavior
• Monitor for unauthorized privilege escalation attempts on affected devices

How to Mitigate CVE-2026-24928

Immediate Actions Required

• Update affected Huawei devices to the latest firmware version that includes the security patch
• Review the Huawei Security Bulletin for specific patch guidance
• Audit local access to affected devices and restrict where possible
• Remove or quarantine any suspicious applications that may attempt exploitation

Patch Information

Huawei has released security updates addressing this vulnerability as part of their February 2026 security bulletin. Users running EMUI 14.2.0 or HarmonyOS 4.2.0 should update their devices through the official system update mechanism. Detailed patch information and update instructions are available in the Huawei Security Bulletin.

Workarounds

• Restrict physical access to vulnerable devices until patches can be applied
• Limit application installation to trusted sources only (official app stores)
• Enable device encryption to add an additional layer of protection for sensitive data
• Review and minimize installed applications to reduce local attack surface