CVE-2025-58342 is a kernel-level vulnerability found in the Wi-Fi driver of several Samsung Exynos processors, including models 980, 850, 1080, 1280, 2200, 1330, 1380, 1480, 1580, and wearable processors W920, W930, and W1000. The flaw arises from an unbounded memory allocation triggered by writing a large buffer to the /proc/driver/unifi0/uapsd interface. This procfs interface is used for configuring Unscheduled Automatic Power Save Delivery (U-APSD) parameters related to Wi-Fi power management. Because the driver does not properly limit the size of the input buffer, an attacker can cause excessive kernel memory allocation, leading to exhaustion of kernel memory resources. This can result in denial of service (DoS) conditions such as system crashes, freezes, or reboots. The vulnerability is local in nature, as it requires writing to a procfs file, which typically requires local access or elevated privileges. However, if an attacker can execute code or commands on the device, they could exploit this vulnerability to disrupt device availability. The vulnerability affects a broad range of Samsung devices using these Exynos processors, which are common in Samsung smartphones and wearables. No patches or exploit code are currently publicly available, and no known exploits in the wild have been reported. The lack of a CVSS score means severity must be assessed based on the impact and exploitability characteristics. The vulnerability impacts kernel memory integrity and availability but does not directly expose confidentiality risks. The scope is limited to devices with the affected processors and Wi-Fi drivers. Exploitation does not require user interaction beyond the ability to write to the procfs interface. Overall, this vulnerability represents a significant risk of denial of service on affected Samsung devices.

For European organizations, the primary impact of CVE-2025-58342 is the potential for denial of service on Samsung mobile and wearable devices that use the affected Exynos processors. This could disrupt business operations, especially for organizations relying on mobile connectivity for critical communications, remote work, or IoT device management. The kernel memory exhaustion could cause device crashes or instability, leading to loss of productivity and increased support costs. In sectors such as healthcare, finance, and public services where Samsung devices are prevalent, this could affect service availability and user trust. Additionally, if attackers gain local access to devices, they could leverage this vulnerability to cause targeted disruptions. Although no data breach or privilege escalation is directly indicated, the denial of service impact on endpoint devices can indirectly affect confidentiality and integrity by interrupting security monitoring or patch management processes. The lack of known exploits reduces immediate risk, but the widespread use of affected devices in Europe means the threat could escalate if exploit code emerges.

1. Samsung should prioritize developing and releasing security patches for the affected Wi-Fi drivers in the Exynos processors. Organizations should monitor Samsung security advisories and apply updates as soon as they become available. 2. Restrict access to the /proc/driver/unifi0/uapsd interface by enforcing strict permissions and limiting write access only to trusted system components or administrators. 3. Employ endpoint protection solutions that monitor for abnormal kernel memory usage or unusual writes to procfs interfaces to detect potential exploitation attempts. 4. For organizations managing fleets of Samsung devices, implement mobile device management (MDM) policies that enforce timely patching and restrict installation of untrusted applications that could attempt local exploitation. 5. Conduct regular security audits and vulnerability assessments on mobile and wearable devices to identify outdated firmware or drivers. 6. Educate users and administrators about the risks of local privilege escalation and denial of service vulnerabilities, emphasizing the importance of device hygiene and cautious handling of device interfaces. 7. Consider network segmentation and limiting device exposure to untrusted networks to reduce the risk of attackers gaining local access required for exploitation.