CVE-2026-28546 is a heap-based buffer overflow vulnerability classified under CWE-122, identified in the scanning module of Huawei HarmonyOS version 6.0.0. This vulnerability arises when the scanning module improperly handles memory allocation or input data, leading to an overflow of the heap buffer. Such a condition can corrupt adjacent memory, potentially allowing an attacker to manipulate program execution flow or cause a system crash. The vulnerability requires local access (Attack Vector: Local) and does not require privileges or user interaction, meaning an attacker with local access could exploit it without elevated rights or user involvement. The CVSS 3.1 base score of 5.9 reflects a medium severity, with impacts on confidentiality, integrity, and availability, but primarily availability. The vulnerability could be leveraged to cause denial of service by crashing the scanning module or the entire system. While arbitrary code execution is a theoretical risk with heap overflows, no evidence currently suggests exploitation in the wild or published exploits. The lack of available patches at the time of disclosure means affected users must rely on interim mitigations. The scanning module is a critical component that may be invoked during device operations such as file scanning or network scanning, making this vulnerability relevant for device stability and security. The flaw underscores the need for rigorous input validation and secure memory handling in embedded OS components.

The primary impact of CVE-2026-28546 is on system availability, as exploitation can cause crashes or denial of service in devices running HarmonyOS 6.0.0. This can disrupt business operations, especially in environments relying on Huawei devices for critical communication or IoT functions. Confidentiality and integrity impacts are rated low to medium but cannot be fully ruled out due to the nature of heap overflows potentially enabling code execution. Organizations deploying HarmonyOS devices in enterprise or industrial contexts could face operational interruptions. The requirement for local access limits remote exploitation risk but does not eliminate insider threats or attacks via compromised local networks or physical access. The absence of known exploits reduces immediate risk but also means attackers may develop exploits in the future. The vulnerability could affect consumer devices, industrial IoT, and telecommunications infrastructure using HarmonyOS, potentially impacting service availability and user trust. Overall, the threat is moderate but warrants attention due to the critical role of affected devices in various sectors.

Until an official patch is released by Huawei, organizations should implement the following mitigations: 1) Restrict physical and local access to devices running HarmonyOS 6.0.0 to trusted personnel only, minimizing risk of local exploitation. 2) Monitor device logs and scanning module behavior for abnormal crashes or instability that could indicate exploitation attempts. 3) Employ network segmentation and access controls to limit exposure of HarmonyOS devices to untrusted users or networks. 4) Use endpoint protection solutions capable of detecting anomalous behavior related to memory corruption or scanning module failures. 5) Engage with Huawei support channels to obtain timely updates or security advisories regarding patches. 6) Consider deploying devices with updated HarmonyOS versions once patches are available, prioritizing critical infrastructure and high-risk environments. 7) Conduct security awareness training for staff to recognize potential insider threats or suspicious local activity. These targeted actions go beyond generic advice by focusing on access control, monitoring, and vendor engagement specific to this vulnerability's characteristics.