CVE-2024-44998 is a use-after-free vulnerability identified in the Linux kernel's ATM (Asynchronous Transfer Mode) subsystem, specifically within the idt77252 driver component. The flaw occurs in the dequeue_rx() function, where the code attempts to dereference a socket buffer (skb) after it has been released by a call to vcc->push(). This improper handling of memory can lead to use-after-free conditions, which are a class of memory corruption vulnerabilities. Exploiting this vulnerability could allow an attacker with the ability to interact with the affected ATM driver to cause kernel crashes (denial of service) or potentially execute arbitrary code with kernel privileges, depending on the surrounding context and system configuration. The vulnerability affects specific Linux kernel versions identified by commit hashes, indicating it is present in certain recent kernel builds prior to the patch. No CVSS score has been assigned yet, and there are no known exploits in the wild at the time of publication. The ATM subsystem is less commonly used today but remains present in some specialized or legacy network environments. The vulnerability was reserved on August 21, 2024, and published on September 4, 2024, with patches presumably available though not linked in the provided data.

For European organizations, the impact of CVE-2024-44998 depends largely on the presence and use of the ATM subsystem and the idt77252 driver within their Linux environments. Organizations operating legacy telecommunications infrastructure, industrial control systems, or specialized networking equipment that rely on ATM may be at risk. Successful exploitation could lead to kernel crashes, causing service disruptions and potential downtime, which is critical for sectors like telecommunications, finance, and critical infrastructure. In worst-case scenarios, exploitation might allow privilege escalation to kernel level, threatening confidentiality and integrity of data and systems. However, given the niche nature of ATM usage, the overall exposure is limited compared to more widespread Linux kernel vulnerabilities. Nonetheless, organizations with embedded systems or legacy network devices running affected Linux kernels should consider this a serious risk. The lack of known exploits currently reduces immediate threat but does not preclude future active exploitation, especially as attackers often target kernel vulnerabilities for persistent footholds.

European organizations should first identify whether their Linux systems utilize the ATM subsystem and specifically the idt77252 driver. This can be done by checking kernel configurations and loaded modules. Systems running affected kernel versions should be updated promptly to the patched versions where this use-after-free issue is resolved. If immediate patching is not feasible, disabling the ATM subsystem or unloading the idt77252 module can mitigate exposure. Additionally, organizations should implement strict access controls to limit who can interact with kernel drivers and network interfaces, reducing the attack surface. Employing kernel hardening techniques such as Kernel Address Space Layout Randomization (KASLR), and enabling security modules like SELinux or AppArmor can help mitigate exploitation impact. Continuous monitoring for unusual kernel crashes or suspicious activity related to network drivers is recommended. Finally, maintaining an up-to-date inventory of Linux kernel versions and modules in use will facilitate rapid response to similar vulnerabilities in the future.