RDMA/bnxt_re Max Slot Validation Flaw

Executive Summary

This vulnerability in the Linux kernel involves a missing validation check in the RDMA/bnxt_re driver. The issue occurs when the Work Queue Entry (WQE) mode is not properly checked against the maximum slots supported by the hardware. The maximum supported value is 64K slots. Without this check, a user could supply a value exceeding the hardware limit, potentially causing system instability or crashes.

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Detection Guidance

This vulnerability is specific to the Linux kernel's RDMA/bnxt_re driver and involves a check for maximum WQE slots. Detection requires verifying kernel version and driver configuration. Check kernel version with 'uname -r' and inspect bnxt_re driver parameters via 'lsmod | grep bnxt_re' or 'modinfo bnxt_re'. Look for misconfigured slot values in driver logs using 'dmesg | grep bnxt_re'.

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Impact Analysis

This vulnerability could allow an attacker with local access to cause a denial-of-service (DoS) condition by triggering an out-of-bounds write or invalid memory access in the RDMA subsystem. This may lead to system crashes, data corruption, or unauthorized privilege escalation depending on the kernel configuration and system state.

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Compliance Impact

This vulnerability does not directly affect compliance with GDPR, HIPAA, or similar standards. The issue is specific to the Linux kernel's RDMA/bnxt_re driver, involving a validation flaw for WQE mode against hardware-supported slots. No evidence suggests it impacts data protection, privacy, or security controls required by these regulations.

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Mitigation Strategies

Update the Linux kernel to the latest patched version to resolve the RDMA/bnxt_re vulnerability. Ensure the WQE mode is validated against the maximum slots supported by hardware, which is 64K. Check and enforce the max and min slot limits to prevent user-supplied values exceeding the maximum.

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