CVE-2024-0562 is a use-after-free vulnerability discovered in the Linux Kernel that arises during disk removal operations. When a disk is removed, the kernel function bdi_unregister is invoked to halt further write-back operations and waits for any associated delayed work to complete. However, due to a race condition, the function wb_inode_writeback_end() may schedule bandwidth estimation work after the delayed work completion, causing a timer to access the bdi_writeback structure that has already been freed. This use-after-free condition can lead to memory corruption, which attackers with local privileges can exploit to execute arbitrary code with elevated privileges or cause a denial of service by crashing the kernel. The vulnerability has a CVSS 3.1 base score of 7.8, reflecting high impact on confidentiality, integrity, and availability, with low attack complexity and requiring only low privileges without user interaction. Although no known exploits are currently reported in the wild, the flaw affects all Linux kernel versions handling disk write-back in this manner. The vulnerability is particularly relevant for environments with frequent disk removal or hot-swapping, such as data centers and cloud infrastructure. The flaw was assigned and published by Red Hat on January 15, 2024, and no patches were linked at the time of reporting, indicating the need for vigilance and prompt patch application once available.

For European organizations, this vulnerability poses significant risks to the confidentiality, integrity, and availability of Linux-based systems, especially those managing critical storage operations. Exploitation could allow local attackers to escalate privileges, potentially gaining root access, or cause system crashes leading to denial of service. This is particularly concerning for data centers, cloud service providers, and enterprises relying on Linux servers for critical infrastructure and services. The disruption could affect business continuity, data protection compliance (e.g., GDPR), and operational technology environments. Given the widespread use of Linux in European government, finance, telecommunications, and industrial sectors, the impact could be broad and severe if exploited. The absence of known exploits currently provides a window for proactive mitigation.

Organizations should monitor Linux kernel updates closely and apply security patches addressing CVE-2024-0562 as soon as they are released by their Linux distribution vendors. Until patches are available, administrators should minimize disk removal or hot-swapping activities on production systems and avoid unnecessary write-back operations during maintenance windows. Implement strict access controls to limit local user privileges and employ kernel integrity monitoring tools to detect anomalous behavior related to write-back timers and memory corruption. Additionally, consider isolating critical systems to reduce the risk of local privilege escalation spreading. Regularly audit system logs for kernel errors or crashes that might indicate exploitation attempts. Engage with Linux vendor security advisories and subscribe to vulnerability notifications to stay informed about patch availability and exploit developments.