CVE-2025-54626 is a use-after-free vulnerability identified in the cjwindow module of Huawei's HarmonyOS version 5.1.0. This vulnerability is classified under CWE-416, which pertains to use-after-free errors where a program continues to use a pointer after the memory it points to has been freed. In this specific case, the dangling pointer issue in the cjwindow module can lead to instability in the affected functions. The vulnerability requires local access (AV:L) and low attack complexity (AC:L), with privileges required (PR:L) but no user interaction (UI:N). The scope is unchanged (S:U), meaning the impact is limited to the vulnerable component. The CVSS v3.1 base score is 4.4, indicating a medium severity level. Exploitation could result in integrity and availability impacts, such as crashes or unexpected behavior in the system, but does not compromise confidentiality. No known exploits are currently reported in the wild, and no patches have been linked yet. The vulnerability could be leveraged by an attacker with some level of local access and privileges to cause function instability, potentially leading to denial of service or other reliability issues within HarmonyOS devices running this version.

For European organizations using Huawei HarmonyOS devices, particularly version 5.1.0, this vulnerability could lead to reduced system stability and potential denial of service conditions on affected devices. While the confidentiality of data is not directly at risk, the integrity and availability of system functions could be compromised, impacting business operations relying on these devices. This is especially relevant for sectors where HarmonyOS devices are integrated into critical workflows or IoT environments, such as manufacturing, telecommunications, or smart city infrastructure. The requirement for local privileges limits remote exploitation, but insider threats or compromised devices could still exploit this vulnerability. The lack of known exploits reduces immediate risk, but the medium severity rating suggests that organizations should proactively address this issue to maintain operational stability and security posture.

Given the absence of an official patch, European organizations should implement several practical mitigation steps: 1) Restrict local access to HarmonyOS devices by enforcing strict access controls and monitoring for unauthorized privilege escalations. 2) Employ application whitelisting and endpoint protection to detect and prevent suspicious activities that could exploit this vulnerability. 3) Conduct regular audits of device configurations and usage to identify potential misuse or anomalous behavior. 4) Engage with Huawei support channels to obtain updates on patch availability and apply them promptly once released. 5) For critical environments, consider isolating HarmonyOS devices or limiting their network connectivity to reduce the attack surface. 6) Train staff on the risks associated with local privilege misuse and encourage reporting of unusual device behavior. These targeted measures go beyond generic advice by focusing on access control, monitoring, and vendor engagement specific to this vulnerability.