CVE-2024-41029 is a vulnerability identified in the Linux kernel's nvmem subsystem, specifically related to sysfs attribute permission handling. The nvmem (non-volatile memory) subsystem exposes device memory cells via sysfs attributes, which are used by user-space applications to read or configure hardware parameters. The vulnerability arises because the 'cell' sysfs attribute was not properly restricting access permissions to match those of the 'main' attribute. For example, if the main attribute was configured with restricted access (e.g., read access limited to root only via nvme_config::root_only), the cell attribute still allowed broader read access to all users. This permission mismatch could lead to unauthorized users reading sensitive nvmem data that should have been protected. The fix involves masking out permissions on the cell attribute that are not available on the main attribute, ensuring consistent and appropriate access control. This vulnerability affects specific Linux kernel versions identified by the commit hash 0331c611949fffdf486652450901a4dc52bc5cca. There are no known exploits in the wild at the time of publication, and no CVSS score has been assigned yet. The issue was reserved and published in July 2024, indicating it is a recent discovery and patch.

For European organizations, this vulnerability could have significant implications, especially for those relying on Linux-based systems in critical infrastructure, enterprise servers, or embedded devices that utilize the nvmem subsystem. Unauthorized access to nvmem data could lead to leakage of sensitive hardware configuration or state information, potentially aiding attackers in further exploitation or reconnaissance. While the vulnerability does not directly allow code execution or privilege escalation, the confidentiality breach could undermine system security posture. Organizations in sectors such as telecommunications, manufacturing, finance, and government, which often deploy Linux in their operational technology or data centers, may be at risk if they run affected kernel versions without the patch. The lack of known exploits reduces immediate risk, but the ease of reading sensitive data without proper permissions makes it a concern for insider threats or attackers with limited access. Additionally, the vulnerability could be leveraged as part of a multi-stage attack chain to escalate privileges or bypass security controls.

European organizations should promptly identify Linux systems running the affected kernel versions (noted by the commit hash 0331c611949fffdf486652450901a4dc52bc5cca) and apply the official patches or kernel updates provided by their Linux distribution vendors. Since the vulnerability is related to sysfs attribute permissions, administrators should audit sysfs access controls and verify that no unintended permission escalations exist on nvmem attributes. Employing strict access control policies and minimizing user access to sysfs interfaces can reduce exposure. For embedded or specialized devices, coordinate with hardware vendors to ensure firmware and kernel updates include the fix. Monitoring system logs for unusual access patterns to sysfs attributes and implementing mandatory access controls (e.g., SELinux, AppArmor) can provide additional layers of defense. Finally, organizations should maintain an inventory of Linux kernel versions in use and integrate vulnerability scanning tools that can detect this specific CVE to ensure timely remediation.