Welcome to our detailed analysis of CVE-2024-53058, a recent cybersecurity vulnerability identified in the Linux kernel. This issue was classified with a severity rating of medium and has a CVSS score of 5.5. By dissecting this CVE, we aim to enhance your understanding of the error, its impact, and the remediation steps taken to secure Linux systems.
The issue arises within the network management component of the Linux kernel, particularly affecting the Enhanced Networking Interface (stmmac), which handles the DMA (Direct Memory Access) operations required for high-speed data transfer between the network interface and the system memory. The vulnerability specifically impacts how DMA operations are mapped and unmapped for non-paged data in certain scenarios.
Inside the Linux kernel, a buffer known as the Socket Kernel Buffer (SKB) is used for storing data packets during transmission. In certain configurations where either the DMA AXI (Advanced eXtensible Interface) address width is extended beyond the standard 32-bits, or the non-paged data exceeds the predefined maximum buffer size, multiple DMA descriptors are needed to manage the data.
Each of these descriptors should ideally map to a unique segment of the data to prevent overlap or data corruption. However, the flaw in CVE-2024-53058 lies in the incorrect indexing within the array that holds these descriptors. Consequently, when the DMA engine processes the descriptors, an unaligned descriptor can result in the premature unmapping of DMA buffers. This mismanagement leads to potential data corruption or IOMMU (Input-Output Memory Management Unit) faults as the DMA tries to access memory regions that have been unmapped.
The improper handling of memory in high-speed data transactions can lead to corrupted data being transmitted over the network, which not only affects system reliability but also compromises data integrity. For enterprises relying on Linux systems for critical operations, this could translate into significant system disruptions and data loss scenarios.
The resolution involves modifying the array indexing procedure during the DMA mapping and unmapping stages. By ensuring that each descriptor is accurately mapped to corresponding segments of the buffer, the integrity of data transactions is maintained, and the system is safeguarded against potential crashes or data corruption.
This patch has been thoroughly tested and verified, particularly with the DWXGMAC CORE 3.20a, ensuring that it effectively resolves the issue without introducing additional overheads or complications into the network management routines.
CVE-2024-53058 demonstrates the intricate and critical nature of memory management in network interfaces on Linux systems. Through the prompt identification and resolution of such vulnerabilities, Linux continues to uphold its reputation as a robust and secure operating system. We encourage all users and administrators to apply the latest patches and stay informed on best practices for system security.
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