perf: Fix addr_filter_ranges lifetime under RCU

Executive Summary

This vulnerability in the Linux kernel involves a lifetime management issue with the addr_filter_ranges field used in performance monitoring (perf). The field is accessed under RCU (Read-Copy-Update) protection but was not being freed using RCU mechanisms, which could lead to use-after-free issues or memory leaks.

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Detection Guidance

This vulnerability is specific to the Linux kernel's perf subsystem and involves improper handling of addr_filter_ranges under RCU. Detection requires checking kernel version and perf tool functionality. Use commands like 'uname -r' to check kernel version and 'perf --version' to verify perf tool. If kernel is 6.11 or later, the fix is likely included.

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Impact Analysis

This vulnerability could allow an attacker to cause a denial-of-service condition or potentially escalate privileges by exploiting the improper memory management in the perf subsystem. It may lead to system instability or crashes if exploited.

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Compliance Impact

This vulnerability does not directly affect compliance with GDPR, HIPAA, or similar standards. It is a Linux kernel issue related to memory management in the perf subsystem, which could lead to local privilege escalation or information disclosure. Compliance impacts would depend on system-specific configurations and usage rather than the vulnerability itself.

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Mitigation Strategies

Immediate mitigation involves updating the Linux kernel to a patched version where this issue is resolved. Check your distribution's security updates and apply them promptly. If updating is not immediately possible, consider disabling the perf subsystem temporarily as a workaround.

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