CVE-2025-58340 is a kernel-level vulnerability found in the Wi-Fi driver of Samsung Exynos processors, including models 980, 850, 1080, 1280, 2200, 1330, 1380, 1480, 1580, and wearable processors W920, W930, and W1000. The issue arises from an unbounded memory allocation triggered by writing a large buffer to the /proc/driver/unifi0/send_delts interface. This interface is part of the driver’s procfs entry, which allows user-space processes to interact with kernel components. By writing an excessively large buffer, an attacker can cause the kernel to allocate memory without proper bounds checking, leading to kernel memory exhaustion. This exhaustion can result in denial of service conditions such as system crashes, reboots, or severe performance degradation. The vulnerability is local in nature, requiring access to the device to perform the write operation, but does not require user interaction beyond that. No CVSS score has been assigned yet, and no public exploits are known. The affected processors are widely used in Samsung mobile phones and wearable devices, which are prevalent in consumer and enterprise environments. The flaw’s kernel-level impact makes it significant, as it affects system stability and availability. Samsung is expected to release patches or firmware updates to address this issue. Until then, devices remain vulnerable to potential exploitation by malicious actors with local access.

For European organizations, the impact of CVE-2025-58340 can be substantial, especially those that deploy Samsung mobile devices or wearables as part of their operational infrastructure or employee equipment. The vulnerability can lead to denial of service conditions on affected devices, causing system crashes or degraded performance that disrupt business operations, communications, or security monitoring. In sectors like finance, healthcare, or critical infrastructure where device availability and reliability are paramount, such disruptions could have cascading effects. Additionally, attackers with local access could leverage this flaw to destabilize devices, potentially as part of a broader attack chain. The lack of known exploits reduces immediate risk, but the widespread use of affected Samsung processors in Europe increases the attack surface. Organizations with Bring Your Own Device (BYOD) policies or mobile workforce relying on Samsung devices should be particularly vigilant. The vulnerability does not directly expose confidentiality or integrity but impacts availability, which is critical for operational continuity.

To mitigate CVE-2025-58340, European organizations should: 1) Monitor Samsung’s official security advisories and promptly apply firmware or driver updates once available. 2) Restrict local access to devices, enforcing strong physical security and device management policies to prevent unauthorized users from exploiting the vulnerability. 3) Employ mobile device management (MDM) solutions to enforce security policies and remotely manage patches on Samsung devices. 4) Limit or disable access to the /proc/driver/unifi0/send_delts interface where feasible, or apply kernel-level access controls to restrict write permissions to trusted processes only. 5) Educate users about the risks of installing untrusted applications or granting unnecessary permissions that could facilitate local exploitation. 6) Implement network segmentation and monitoring to detect anomalous device behavior indicative of exploitation attempts. 7) Prepare incident response plans to quickly address potential denial of service events caused by this vulnerability. These steps go beyond generic advice by focusing on controlling local access, interface permissions, and proactive patch management specific to the affected Samsung processors.