net: sxgbe TX ring leak on RX allocation failure

Executive Summary

This vulnerability in the Linux kernel occurs when RX descriptor ring allocation fails during initialization. The function init_dma_desc_rings() only frees the partially allocated RX rings and returns, but TX rings allocated earlier in the same function are not freed, leading to a memory leak.

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Detection Guidance

This vulnerability involves memory leaks in the Linux kernel's sxgbe network driver when RX descriptor ring allocation fails. Detection requires checking for kernel logs or memory leaks related to the sxgbe driver. Use commands like 'dmesg | grep sxgbe' to inspect driver logs or 'cat /proc/meminfo' to monitor memory usage for anomalies.

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Impact Analysis

This vulnerability can cause memory leaks in the Linux kernel, potentially leading to resource exhaustion. Systems using the affected net: sxgbe driver may experience degraded performance or crashes due to unmanaged memory usage.

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Mitigation Strategies

Apply the latest Linux kernel patches that address this issue. Update your system using your package manager (e.g., 'apt upgrade' or 'yum update'). If patches are unavailable, consider disabling the sxgbe driver if not in use or monitor for memory leaks as a temporary measure.

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