CVE-2024-40929 is a vulnerability identified in the Linux kernel's wireless networking subsystem, specifically within the iwlwifi driver which manages Intel wireless devices. The flaw arises from improper validation of the number of SSIDs (n_ssids) before accessing the SSID pointer in the cfg80211 component. In some versions, even when n_ssids is zero, the SSID pointer may still be valid, leading to an out-of-bounds memory access when the code attempts to dereference it without checking n_ssids first. This type of vulnerability can cause memory corruption, potentially leading to system instability, crashes (denial of service), or could be leveraged for privilege escalation or arbitrary code execution if exploited by a malicious actor. The issue was addressed by adding a check on n_ssids before accessing the SSID pointer, preventing out-of-bound access. The vulnerability affects multiple versions of the Linux kernel as indicated by the affected commit hashes, though exact kernel version numbers are not specified. There are currently no known exploits in the wild, and no CVSS score has been assigned yet. The vulnerability is categorized as a memory safety issue within a widely used wireless driver, which is critical for network connectivity on many Linux-based systems.

For European organizations, this vulnerability poses a risk primarily to systems running Linux with Intel wireless hardware using the affected iwlwifi driver versions. Many enterprises, government agencies, and critical infrastructure operators in Europe rely on Linux servers, desktops, and embedded devices for daily operations. Exploitation could lead to denial of service through kernel crashes, disrupting business continuity and critical services. More severe exploitation could allow attackers to execute arbitrary code with kernel privileges, potentially leading to full system compromise, data breaches, or lateral movement within networks. Given the widespread use of Linux in sectors such as telecommunications, finance, manufacturing, and public administration across Europe, the impact could be significant if exploited. The absence of known exploits currently reduces immediate risk, but the vulnerability’s presence in a core kernel component means that attackers may develop exploits in the future. Additionally, the vulnerability could affect IoT devices and embedded systems running Linux, which are increasingly prevalent in European smart city and industrial environments.

European organizations should prioritize updating their Linux kernel to the latest patched versions that include the fix for CVE-2024-40929. Since the vulnerability is in the iwlwifi driver, systems using Intel wireless hardware should be specifically targeted for patching. Network administrators should audit their Linux systems to identify affected kernel versions and apply vendor-provided patches or kernel updates promptly. For environments where immediate patching is not feasible, consider disabling wireless interfaces or restricting wireless usage to reduce exposure. Monitoring kernel logs for unusual crashes or anomalies related to wireless drivers can help detect potential exploitation attempts. Organizations should also ensure that endpoint protection and intrusion detection systems are tuned to detect suspicious activities involving kernel memory corruption. Finally, maintain robust network segmentation and least privilege principles to limit the impact of any potential compromise stemming from this vulnerability.