CVE-2026-28541 identifies a permissions and access control vulnerability classified under CWE-264 in the cellular_data module of Huawei's HarmonyOS, specifically versions 5.1.0 and 6.0.0. The flaw allows an unauthenticated local attacker to exploit insufficient permission checks, leading to a denial of service (DoS) condition that impacts system availability. The vulnerability does not compromise confidentiality or integrity but can disrupt cellular data services, potentially causing loss of network connectivity or system instability. The CVSS v3.1 base score is 4.0, reflecting low attack complexity and no required privileges or user interaction, but limited impact scope. The attack vector is local, meaning the attacker must have local access to the device, such as through a compromised app or physical access. No public exploits or patches are currently available, indicating the vulnerability is newly disclosed. The root cause lies in improper enforcement of access controls within the cellular_data module, which manages cellular network connectivity and data transmission. This module's compromise can degrade device availability, affecting user experience and dependent applications. Given Huawei's significant market share in mobile devices and IoT in Asia, Europe, and parts of Africa, this vulnerability has a geographically concentrated risk profile. The vulnerability underscores the importance of robust permission models in OS components managing critical connectivity functions.

The primary impact of CVE-2026-28541 is on system availability, potentially causing denial of service conditions that disrupt cellular data connectivity on affected Huawei HarmonyOS devices. This can lead to loss of network access, affecting communication, data transmission, and any services reliant on cellular connectivity. For organizations, this may result in operational disruptions, especially for those relying on Huawei devices for critical communications or IoT deployments. Although the vulnerability does not compromise data confidentiality or integrity, the availability impact can degrade user experience and business continuity. The requirement for local access limits remote exploitation risk but raises concerns in environments where devices may be physically accessible or compromised by malicious insiders or malware. The absence of known exploits reduces immediate risk, but the lack of patches means the vulnerability remains a latent threat. Organizations using affected HarmonyOS versions should consider the potential for targeted attacks aiming to disrupt cellular services, particularly in sectors like telecommunications, government, and critical infrastructure where Huawei devices are prevalent.

1. Restrict local access to devices running affected HarmonyOS versions by enforcing strong physical security controls and limiting user permissions. 2. Monitor Huawei's official security advisories and promptly apply patches or updates once available to remediate the vulnerability. 3. Employ endpoint protection solutions capable of detecting anomalous local activities that may attempt to exploit permission weaknesses in system modules. 4. Implement network-level monitoring to detect unusual cellular data disruptions that could indicate exploitation attempts. 5. For organizations deploying HarmonyOS in critical environments, consider network segmentation and device isolation to limit the impact of potential availability attacks. 6. Conduct regular security audits and penetration testing focusing on permission and access control mechanisms within device OS components. 7. Educate users and administrators about the risks of local exploitation and the importance of safeguarding device access. 8. If possible, disable or restrict the cellular_data module functionality on devices where cellular connectivity is not required to reduce attack surface.