A memory corruption vulnerability was addressed with improved locking. This issue is fixed in iOS 17.1.2 and iPadOS 17.1.2, macOS Sonoma 14.1.2, Safari 17.1.2. Processing web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been exploited against versions of iOS before iOS 16.7.1.
https://support.apple.com/en-us/HT214033
https://support.apple.com/en-us/HT214032
https://support.apple.com/en-us/HT214031
https://isc.sans.edu/diary/rss/30444
https://www.debian.org/security/2023/dsa-5575
https://support.apple.com/kb/HT214062
https://support.apple.com/kb/HT214034
https://support.apple.com/kb/HT214033
https://security.gentoo.org/glsa/202401-04
http://www.openwall.com/lists/oss-security/2023/12/05/1
http://seclists.org/fulldisclosure/2024/Jan/35
http://seclists.org/fulldisclosure/2023/Dec/8
http://seclists.org/fulldisclosure/2023/Dec/5
http://seclists.org/fulldisclosure/2023/Dec/4
http://seclists.org/fulldisclosure/2023/Dec/3