Linux Kernel Trace Module Record Use-After-Free

Executive Summary

This vulnerability in the Linux kernel involves a race condition in the tracing subsystem. When updating modules in persistent instances, the trace_module_record() function accesses the ftrace_trace_arrays list without holding the trace_types_lock. If another process removes a trace instance via rmdir concurrently, it may free the trace_array while the module notifier is still accessing it, leading to a use-after-free scenario.

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Detection Guidance

This vulnerability affects the Linux kernel's tracing subsystem. Detection requires checking kernel versions and tracing configurations. Use 'uname -r' to check the kernel version and verify if it is affected. Inspect trace instances with 'ls /sys/kernel/debug/tracing/instances/' and check for concurrent operations during module load/unload events.

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Impact Analysis

This flaw could allow local attackers to escalate privileges, execute arbitrary code, or cause a denial of service by triggering the race condition. Systems running vulnerable Linux kernels may experience crashes, data corruption, or unauthorized access 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 involving memory corruption during module operations in tracing subsystems, which could lead to system instability or crashes but does not inherently violate data protection or privacy regulations.

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Mitigation Strategies

Apply the latest kernel update provided by your Linux distribution to patch this vulnerability. If immediate patching is not possible, avoid creating or removing trace instances during module load/unload operations to reduce exposure. Monitor system logs for trace-related errors or crashes.

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