A memory corruption issue was addressed with improved memory handling. This issue is fixed in macOS Catalina 10.15, tvOS 13. An application may be able to execute arbitrary code with kernel privileges.
CWE-787 - Out-of-Bounds Write
Out-of-bounds write vulnerability is a memory access bug that allows software to write data past the end or before the beginning of the intended buffer. This may result in the corruption of data, a crash, or arbitrary code execution.