An input validation issue was addressed with improved memory handling. This issue is fixed in macOS Big Sur 11.1, Security Update 2020-001 Catalina, Security Update 2020-007 Mojave. A malicious application may be able to read restricted memory.
https://support.apple.com/en-us/HT212011
https://lists.debian.org/debian-lts-announce/2021/10/msg00027.html