An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in Security Update 2022-004 Catalina, macOS Monterey 12.4, macOS Big Sur 11.6.6. A malicious application may be able to execute arbitrary code with kernel privileges.
https://support.apple.com/en-us/HT213256
https://support.apple.com/en-us/102770