CVE-2026-68177tracing: Delay module ref count for "enable_event" trigger

Official description

In the Linux kernel, the following vulnerability has been resolved: tracing: Delay module ref count for "enable_event" trigger Triggers are now delayed from freeing, but can still be triggered until after the RCU grace period has ended. The freeing of the enable_event data is put into the private_data_free() callback, but the put of the module refcount is done immediately. It is possible that if a module is removed that has an event that would enable (or disable) it is still active, it can read the data of the module after it is removed causing a use-after-free bug. Move the trace_event_put_ref() that releases the module into the delayed callback so that the module can not be removed until any reference to its events are finished.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/159fdc3e01dca5fdbc412fcd8b239895733a270d
• https://git.kernel.org/stable/c/e091351b38818ef620d27f44f4bfd625f13afbff