Hotplug State Buffer Overflow in Linux Kernel

Executive Summary

This vulnerability in the Linux kernel involves a buffer overflow in the CPU hotplug states sysfs output. The states_show() function writes CPU hotplug state names into a sysfs buffer using sprintf(), which can exceed the buffer's PAGE_SIZE limit if enough states are registered. This allows writing past the buffer's end.

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Detection Guidance

This vulnerability is specific to the Linux kernel's CPU hotplug functionality and may not have direct network detection methods. Check kernel logs for CPU hotplug state errors or sysfs buffer overflow warnings. Commands like dmesg | grep -i hotplug or cat /sys/devices/system/cpu/cpu*/online may help identify issues.

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Impact Analysis

This vulnerability could allow an attacker to corrupt kernel memory by triggering excessive CPU hotplug states. This might lead to system crashes, privilege escalation, or other malicious activities depending on the attacker's goals and system configuration.

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Compliance Impact

This vulnerability does not directly affect compliance with GDPR, HIPAA, or similar standards as it is a low-level kernel issue related to buffer overflow in CPU hotplug state output. No evidence suggests it impacts data protection, privacy, or security controls required by these regulations.

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Mitigation Strategies

Update your Linux kernel to the latest stable version that includes the fix for this vulnerability. Monitor kernel updates from your distribution vendor and apply patches promptly. No additional configuration changes are required beyond the kernel update.

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