CVE-2026-23309: In the Linux kernel, the following vulnerability has been resolved: tracing: Add NULL pointer check to trigger_data_fre

A vulnerability in the Linux kernel's tracing system occurs when trigger_data_alloc() (a memory allocation function) fails and returns NULL, causing the error handler to call trigger_data_free() on a null value. Unlike the safe kfree() function, trigger_data_free() doesn't check for NULL pointers before trying to access data, leading to a crash when it tries to evaluate data->cmd_ops->set_filter.