tracing: Hold trace_types_lock when updating modules in persistent instances

Summary

In the Linux kernel, the following vulnerability has been resolved: tracing: Hold trace_types_lock when updating modules in persistent instances trace_module_record() walks ftrace_trace_arrays from the module notifier without trace_types_lock. A concurrent rmdir of an instance removes it from the list and frees it under that lock, so a module load or unload can walk into a freed trace_array.

Remediation

1. Inventory every Linux Linux deployment, including staging.
2. No fixed version appears in the public sources yet. Check the references below and the vendor directly.

References

• Referencehttps://git.kernel.org/stable/c/57408eac99b0d8a005796346d317d31f0ca4e07a
• Referencehttps://git.kernel.org/stable/c/dab2bd4d67ad5eaa95019a9511f8d379401b5021
• Referencehttps://git.kernel.org/stable/c/244c442f54601a24c86ad90572bf36fc3df41c5e
• Referencehttps://git.kernel.org/stable/c/66877a312ae3c2c3d849e82e882f642ffd4ec3e2