CVE-2026-28552 Overview
CVE-2026-28552 is an out-of-bounds write vulnerability affecting the IMS (IP Multimedia Subsystem) module in Huawei EMUI and HarmonyOS operating systems. This memory corruption flaw allows attackers to write data beyond the boundaries of allocated memory buffers within the IMS component, which handles voice, video, and messaging services over IP networks. Successful exploitation of this vulnerability may impact the availability of affected devices, potentially causing system crashes or denial of service conditions.
Critical Impact
This out-of-bounds write vulnerability in the IMS module can be exploited remotely without authentication, potentially causing denial of service conditions on affected Huawei devices running EMUI and HarmonyOS.
Affected Products
- Huawei EMUI versions 14.0.0, 14.2.0, and 15.0.0
- Huawei HarmonyOS versions 4.0.0, 4.2.0, 4.3.0, 4.3.1, 5.1.0, and 6.0.0
- Huawei devices including smartphones, laptops, and wearables running affected operating system versions
Discovery Timeline
- March 5, 2026 - CVE-2026-28552 published to NVD
- March 5, 2026 - Last updated in NVD database
Technical Details for CVE-2026-28552
Vulnerability Analysis
This vulnerability is classified as CWE-787 (Out-of-bounds Write) and CWE-19 (Data Processing Errors). The flaw resides within the IMS module, a critical component responsible for delivering multimedia communication services including VoLTE (Voice over LTE) and VoWiFi (Voice over Wi-Fi) functionality. The vulnerability can be triggered remotely over the network without requiring user interaction or prior authentication, making it particularly concerning for mobile device security.
The out-of-bounds write condition occurs when the IMS module processes malformed or specially crafted data, allowing an attacker to write beyond the intended memory boundaries. While the primary impact is on system availability rather than confidentiality or integrity, denial of service attacks against mobile devices can significantly disrupt user communications and device functionality.
Root Cause
The root cause of CVE-2026-28552 stems from insufficient boundary validation within the IMS module's data processing routines. When handling incoming IMS protocol messages or data structures, the module fails to properly validate the size or length of input data against allocated buffer sizes. This data processing error (CWE-19) leads to an out-of-bounds write condition (CWE-787), where data can be written past the end of the designated memory region.
The lack of proper bounds checking allows attackers to craft malicious inputs that exceed expected buffer sizes, corrupting adjacent memory regions and potentially causing the IMS service or the entire device to become unresponsive.
Attack Vector
The attack can be executed remotely over the network without requiring authentication or user interaction. An attacker could potentially exploit this vulnerability by:
- Sending specially crafted IMS signaling messages to a target device over the cellular network or Wi-Fi connection
- Exploiting the vulnerability through malformed SIP (Session Initiation Protocol) messages or related IMS protocol data
- Targeting devices with active VoLTE or VoWiFi services enabled
The vulnerability mechanism involves sending malformed data to the IMS module that exceeds expected buffer boundaries. When the IMS module processes this data without proper bounds validation, it writes beyond the allocated memory region, causing memory corruption that leads to service unavailability or device crashes. See the Huawei Consumer Security Bulletin for additional technical details.
Detection Methods for CVE-2026-28552
Indicators of Compromise
- Unexpected device crashes or reboots, particularly when VoLTE or VoWiFi services are active
- IMS service failures or inability to make/receive voice calls over LTE/Wi-Fi
- Abnormal memory consumption patterns in the IMS module processes
- System logs indicating memory access violations or segmentation faults in IMS-related components
Detection Strategies
- Monitor device system logs for crash reports associated with IMS module components
- Implement network-level detection for anomalous IMS/SIP traffic patterns targeting device endpoints
- Deploy endpoint detection solutions capable of identifying out-of-bounds memory access attempts
- Configure alerting for repeated IMS service restarts or failures across managed device fleets
Monitoring Recommendations
- Enable detailed logging for IMS module activity on managed enterprise devices
- Monitor network traffic for malformed SIP/IMS protocol messages targeting internal device addresses
- Implement crash analytics to identify patterns consistent with exploitation attempts
- Review Huawei security bulletins regularly for updated guidance and patch availability
How to Mitigate CVE-2026-28552
Immediate Actions Required
- Apply security updates from Huawei as soon as they become available for affected EMUI and HarmonyOS versions
- Review the Huawei Consumer Security Bulletin for specific patch information
- Prioritize updating devices with active VoLTE or VoWiFi configurations
- Consider temporarily disabling VoLTE/VoWiFi features on critical devices until patches are applied
Patch Information
Huawei has released security advisories addressing this vulnerability in their March 2026 security bulletins. Affected users should consult the following official resources for patch and update information:
- Huawei Consumer Security Bulletin - For smartphone devices
- Huawei Laptops Security Bulletin - For laptop devices
- Huawei Wearables Security Bulletin - For wearable devices
Users should ensure automatic system updates are enabled and apply the latest security patches through Settings > System & updates > Software update on their devices.
Workarounds
- Temporarily disable VoLTE and VoWiFi services if not required, forcing voice calls over traditional cellular networks
- Enable automatic security updates to receive patches as soon as they are released
- Implement network-level filtering to block potentially malicious IMS traffic at enterprise gateways
- Consider using mobile device management (MDM) solutions to enforce security update compliance across device fleets
# Check current EMUI/HarmonyOS version on device
# Navigate to: Settings > About phone > Version
# Verify the security patch level matches or exceeds March 2026
# Enable automatic updates
# Settings > System & updates > Software update > Settings icon
# Enable "Download updates automatically over Wi-Fi"
# Enable "Download updates overnight"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
