USB Gadget RNDIS Header Length Validation Flaw

Executive Summary

This vulnerability in the Linux kernel involves a missing length check in the RNDIS (Remote Network Driver Interface Specification) header handling function rndis_rm_hdr. The issue allows potential access to uninitialized or out-of-bounds memory when processing RNDIS messages, as the code assumes certain header fields like MessageType, MessageLength, DataOffset, and DataLength are present without verifying their existence first.

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Detection Guidance

This vulnerability affects the Linux kernel's USB gadget RNDIS function. Detection requires checking kernel versions and examining network interfaces for RNDIS-related modules. Use commands like 'uname -a' to check kernel version and 'lsmod | grep rndis' to verify if the RNDIS module is loaded. If the module is present and the kernel version is vulnerable, patching is required.

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Impact Analysis

This vulnerability could allow an attacker with physical or network access to a system using the affected Linux kernel to cause a denial of service (system crash) or potentially execute arbitrary code. Systems using USB gadget functions with RNDIS, such as certain network devices or embedded systems, may be affected if they process malicious RNDIS messages.

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Mitigation Strategies

Update the Linux kernel to a patched version that includes the fix for CVE-2026-64505. Monitor vendor advisories for kernel updates and apply them promptly.

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