Memory Leak in Linux Kernel RDMA/mlx5 Driver

Executive Summary

This vulnerability in the Linux kernel involves a mistake in managing RDMA (Remote Direct Memory Access) resources. The kernel incorrectly frees a UAR (User Access Region) index that was provided by hardware instead of the one created by software. This could lead to improper resource cleanup and potential system instability.

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Detection Guidance

This vulnerability is specific to the Linux kernel's RDMA/mlx5 driver and involves improper handling of UAR indices. Detection requires checking kernel logs for related errors or kernel crashes involving mlx5 drivers. Commands like dmesg | grep mlx5 or journalctl -k | grep mlx5 may help identify issues.

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Impact Analysis

This vulnerability may cause system crashes, memory leaks, or unpredictable behavior in systems using RDMA with Mellanox hardware. Users relying on RDMA for high-performance networking could experience disruptions or failures.

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Compliance Impact

This vulnerability does not directly affect compliance with standards like GDPR or HIPAA as it involves a low-level memory management issue in the Linux kernel's RDMA subsystem. No evidence suggests it impacts data protection or privacy requirements.

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Mitigation Strategies

Update the Linux kernel to a patched version that resolves this vulnerability. Check your distribution's security advisories for the specific kernel version addressing CVE-2026-74296.

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