CVE-2024-47698 is a vulnerability identified in the Linux kernel, specifically within the DVB (Digital Video Broadcasting) frontend driver rtl2832. The issue arises from an out-of-bounds write error caused by improper boundary checking in the rtl2832_pid_filter function. The driver maintains a 32-bit value representing filters, with valid bit indices ranging from 0 to 31. However, the original code allowed an index value of 32 to be used, which attempts to access a non-existent 33rd bit, leading to an out-of-bounds memory write. This can corrupt adjacent memory, potentially causing kernel instability, crashes, or enabling privilege escalation or arbitrary code execution under certain conditions. The fix involves changing the boundary check from 'index > 32' to 'index >= 32', ensuring that indices do not exceed the valid range. This vulnerability affects Linux kernel versions containing the vulnerable rtl2832 driver code, which is commonly used for DVB devices. Although no known exploits are currently reported in the wild, the vulnerability represents a risk due to its presence in the kernel space and the potential for memory corruption. The vulnerability does not require user interaction but does require access to the vulnerable driver interface, which may be exposed on systems with DVB hardware or software components using rtl2832.

For European organizations, the impact of CVE-2024-47698 depends on the deployment of Linux systems with DVB hardware or software components using the rtl2832 driver. Many European countries have widespread use of Linux servers, embedded systems, and consumer devices that may include DVB frontends for digital TV reception. Exploitation of this vulnerability could lead to kernel crashes, denial of service, or potentially privilege escalation, undermining system integrity and availability. Critical infrastructure sectors such as telecommunications, broadcasting, and media companies that rely on DVB technology could be particularly affected. Additionally, organizations using Linux-based embedded devices or IoT systems with DVB capabilities could face increased risk. Although no exploits are currently known, the vulnerability's presence in the kernel means that attackers with local access or the ability to interact with the DVB driver could leverage it to compromise systems. This could lead to disruption of services, data integrity issues, or unauthorized access, impacting operational continuity and security compliance within European enterprises.

To mitigate CVE-2024-47698, European organizations should prioritize updating Linux kernel versions to those containing the official patch that corrects the boundary check in the rtl2832_pid_filter function. Kernel updates should be applied promptly on all systems with DVB hardware or software components using the rtl2832 driver. Organizations should audit their environments to identify systems with DVB frontends and assess exposure. Where immediate patching is not feasible, restricting access to DVB devices and interfaces to trusted users only can reduce risk. Additionally, monitoring kernel logs for unusual crashes or memory corruption events related to DVB drivers can help detect exploitation attempts. For embedded and IoT devices, coordination with vendors to obtain patched firmware or kernel versions is critical. Implementing strict access controls and isolating vulnerable devices within network segments can further limit potential attack vectors. Finally, organizations should maintain up-to-date inventory and vulnerability management processes to ensure timely detection and remediation of such kernel vulnerabilities.