CVE-2025-26782 is a vulnerability identified in the Layer 2 (L2) protocol implementation of several Samsung Exynos processors, including models 9820, 9825, 980, 990, 850, 1080, 2100, 1280, 2200, 1330, 1380, 1480, 9110, W920, W930, and modems 5123 and 5300. These processors are widely used in Samsung mobile phones, wearable devices, and modems. The vulnerability stems from improper handling of Radio Link Control (RLC) Acknowledged Mode (AM) Protocol Data Units (PDUs). RLC AM is responsible for reliable data transfer over the radio interface by retransmitting lost or corrupted PDUs. Incorrect processing of these PDUs can cause the affected device to enter a Denial of Service state, potentially disrupting network connectivity or causing device instability. The flaw resides at a low-level protocol layer critical for maintaining communication integrity between the device and cellular networks. Exploitation likely involves sending malformed or specially crafted RLC AM PDUs to the target device, triggering the DoS condition. No authentication or user interaction is required, increasing the risk of remote exploitation by attackers within radio range or via compromised network infrastructure. Although no public exploits have been reported yet, the broad range of affected processors and their deployment in consumer and enterprise devices makes this a significant concern. The absence of a CVSS score suggests the vulnerability is newly disclosed and pending further analysis. The lack of available patches at the time of publication necessitates vigilance from device manufacturers and users. This vulnerability could impact device availability, degrade user experience, and disrupt critical communications, especially in environments relying on Samsung hardware for connectivity.

For European organizations, the primary impact of CVE-2025-26782 is the potential disruption of mobile and wearable device connectivity due to Denial of Service conditions. Telecommunications providers, enterprises with mobile workforce dependencies, and sectors relying on IoT wearables (such as healthcare and manufacturing) could experience operational interruptions. Disrupted device availability may affect critical communications, data access, and real-time monitoring systems. The vulnerability could also degrade network performance if exploited at scale, impacting service quality for end-users. Given the widespread use of Samsung devices in Europe, including smartphones and modems, the risk extends to both consumer and enterprise environments. Organizations involved in mobile network infrastructure or providing managed services may face increased support burdens and reputational risks if devices become unstable or unresponsive. While no data confidentiality or integrity compromise is indicated, the availability impact alone can have significant business consequences, particularly in sectors requiring continuous connectivity. The lack of known exploits currently limits immediate risk, but the potential for future weaponization necessitates proactive mitigation.

Mitigation of CVE-2025-26782 requires coordinated action between device manufacturers, network operators, and end-users. Samsung should prioritize development and distribution of firmware or software patches addressing the RLC AM PDU handling flaw. European organizations should monitor official Samsung security advisories and apply updates promptly once available. Network operators can implement anomaly detection systems to identify unusual RLC traffic patterns indicative of exploitation attempts, enabling early warning and response. Deploying radio access network (RAN) security enhancements, such as filtering malformed PDUs at the network edge, can reduce exposure. Enterprises should inventory Samsung-based devices in their environment to assess exposure and plan for patch deployment. For critical systems, consider temporary network segmentation or limiting device access until patches are applied. Security teams should update incident response playbooks to include detection and mitigation steps for RLC-layer DoS attacks. Collaboration with telecom providers to share threat intelligence and coordinate defenses will enhance resilience. Finally, educating users about potential device instability and encouraging prompt updates will support mitigation efforts.