CVE-2025-58343 is a vulnerability identified in the Wi-Fi driver of Samsung Mobile Processor and Wearable Processor Exynos series, including models 980, 850, 1080, 1280, 1330, 1380, 1480, 1580, W920, W930, and W1000. The issue arises from an unbounded memory allocation triggered when a large buffer is written to the /proc/driver/unifi0/create_tspec interface. This operation leads to kernel memory exhaustion, effectively causing a denial of service (DoS) condition. The vulnerability is classified under CWE-770 (Allocation of Resources Without Limits or Throttling). The CVSS v3.1 base score is 5.5 (medium severity), with vector AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H, indicating local attack vector, low complexity, requiring low privileges, no user interaction, unchanged scope, no confidentiality or integrity impact, but high impact on availability. Exploitation requires local access with some privileges, but no user interaction is needed. The affected interface is a procfs entry, which is typically accessible only to privileged users or processes. No known exploits are currently reported in the wild, and no patches have been published yet. The vulnerability could be leveraged by an attacker with local access to exhaust kernel memory, potentially causing system crashes or instability on devices using the affected Exynos processors. This impacts mobile phones and wearable devices running Samsung chips, which are widely used globally, including in Europe.

For European organizations, the primary impact of CVE-2025-58343 is on the availability of devices running affected Samsung Exynos processors. This includes a broad range of Samsung smartphones and wearables used by employees and potentially integrated into enterprise environments. A successful exploitation could cause device crashes or reboots, disrupting communication, mobile applications, and services dependent on these devices. Critical sectors such as healthcare, finance, and government that rely on mobile connectivity and wearable technology for operational continuity could experience interruptions. Although the vulnerability does not affect confidentiality or integrity, denial of service on mobile endpoints can hinder productivity and emergency response capabilities. Additionally, organizations with Bring Your Own Device (BYOD) policies may face increased risk if employees use vulnerable devices on corporate networks. The lack of current patches means organizations must rely on interim mitigations to reduce exposure. The threat is less severe for organizations that do not use Samsung Exynos-based devices or restrict local access to device internals.

1. Restrict access to the /proc/driver/unifi0/create_tspec interface by enforcing strict permissions and limiting access to trusted system processes only. 2. Implement mobile device management (MDM) policies to monitor and control device configurations, restricting installation of untrusted applications that could exploit local vulnerabilities. 3. Monitor device logs and system metrics for unusual memory usage patterns or kernel crashes indicative of exploitation attempts. 4. Educate users and administrators about the risk of local privilege escalation and the importance of avoiding installation of unverified software. 5. Coordinate with Samsung and device vendors to obtain and apply security patches promptly once available. 6. For critical environments, consider isolating or restricting use of vulnerable devices until patches are deployed. 7. Employ endpoint detection and response (EDR) solutions capable of detecting anomalous behavior related to kernel memory exhaustion. 8. Regularly update device firmware and operating system versions to incorporate security improvements and mitigations.