A memory corruption issue was addressed with improved state management. This issue is fixed in macOS Catalina 10.15.1, Security Update 2019-001, and Security Update 2019-006. An application may be able to execute arbitrary code with kernel privileges.
The product writes data past the end, or before the beginning, of the intended buffer.
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https://support.apple.com/en-us/HT210722 | release notes vendor advisory |