CVE-2026-24915: Huawei HarmonyOS OOB Read Vulnerability

CVE-2026-24915 Overview

CVE-2026-24915 is an out-of-bounds read vulnerability (CWE-125) affecting the media subsystem in Huawei HarmonyOS. This memory corruption flaw allows a local attacker with low privileges to read data beyond the intended buffer boundaries, potentially exposing sensitive information stored in adjacent memory regions and causing system instability or crashes.

Critical Impact

Successful exploitation of this vulnerability will affect availability and confidentiality, allowing attackers to access sensitive data from memory and potentially crash the affected device.

Affected Products

• Huawei HarmonyOS 5.1.0
• Huawei HarmonyOS 5.1.1
• Huawei HarmonyOS 6.0.0

Discovery Timeline

• February 6, 2026 - CVE-2026-24915 published to NVD
• February 10, 2026 - Last updated in NVD database

Technical Details for CVE-2026-24915

Vulnerability Analysis

This out-of-bounds read vulnerability exists within the media subsystem of HarmonyOS. The flaw occurs when the media subsystem processes data without properly validating buffer boundaries, allowing read operations to access memory locations beyond the allocated buffer. An attacker with local access and low-level privileges can exploit this vulnerability to leak sensitive information from adjacent memory regions or cause the system to crash due to invalid memory access.

The vulnerability requires local access to the device, meaning an attacker would need either physical access or to have already established a foothold through another attack vector such as a malicious application. Once exploited, the attacker can extract confidential data from memory that should not be accessible, potentially including cryptographic keys, user credentials, or other sensitive system information.

Root Cause

The root cause of CVE-2026-24915 is improper bounds checking in the media subsystem's memory handling routines. When processing media data, the subsystem fails to validate that read operations remain within the allocated buffer boundaries. This allows an attacker to craft input that triggers reads beyond the intended memory region, exposing data from adjacent allocations.

Out-of-bounds read vulnerabilities typically occur when:

• Array or buffer indices are not validated against the buffer size
• Length calculations contain integer overflow or underflow errors
• Pointer arithmetic results in addresses outside the allocated region

Attack Vector

The attack vector for CVE-2026-24915 is local, requiring the attacker to have existing access to the target device. Exploitation requires low privileges and no user interaction. The attack could be executed through a malicious application installed on the device that interacts with the media subsystem.

A potential attack scenario involves:

1. The attacker installs a malicious application on a HarmonyOS device
2. The application crafts specially formatted media data designed to trigger the out-of-bounds read
3. When the media subsystem processes this data, it reads beyond buffer boundaries
4. Sensitive data from adjacent memory regions is exposed to the attacker
5. The leaked information could be exfiltrated or used for further attacks

The vulnerability affects the confidentiality of system data and can impact availability through denial of service if the invalid memory access causes a crash.

Detection Methods for CVE-2026-24915

Indicators of Compromise

• Unusual crashes or instability in HarmonyOS media subsystem components
• Applications accessing media APIs in abnormal patterns or with malformed data
• Memory access violations or segmentation faults in system logs related to media processing
• Unexpected data leakage from device memory during forensic analysis

Detection Strategies

• Monitor system logs for media subsystem errors, crashes, or memory access violations
• Implement application behavior analysis to detect suspicious media API usage patterns
• Use endpoint protection solutions to identify applications attempting to exploit memory corruption vulnerabilities
• Deploy memory protection mechanisms that can detect out-of-bounds read attempts

Monitoring Recommendations

• Enable verbose logging for media subsystem components to capture detailed error information
• Implement real-time alerting for application crashes involving media processing
• Monitor installed applications for known malicious signatures that target HarmonyOS vulnerabilities
• Review device logs periodically for signs of exploitation attempts

How to Mitigate CVE-2026-24915

Immediate Actions Required

• Update all affected HarmonyOS devices to the latest security patch level as outlined in Huawei's February 2026 security bulletin
• Review installed applications and remove any untrusted or unnecessary software
• Enable automatic security updates to ensure devices receive patches promptly
• Limit physical access to affected devices until patches are applied

Patch Information

Huawei has released security patches addressing CVE-2026-24915 in their February 2026 security bulletins. Organizations and users should apply the latest updates available for their specific device type:

• Huawei Consumer Security Bulletin - For smartphones and tablets
• Huawei Laptops Security Bulletin - For laptop devices
• Huawei Vision Security Bulletin - For smart display products
• Huawei Wearables Security Bulletin - For wearable devices

Users should verify their device is running HarmonyOS with the February 2026 security patch or later.

Workarounds

• Restrict installation of applications to trusted sources only (Huawei AppGallery)
• Disable or limit media-related features if not required until the patch is applied
• Implement mobile device management (MDM) policies to control application installation and usage
• Isolate affected devices from sensitive network resources until patching is complete