A memory initialization issue was addressed. This issue is fixed in macOS Big Sur 11.0.1, watchOS 7.1, iOS 12.4.9, watchOS 6.2.9, Security Update 2020-006 High Sierra, Security Update 2020-006 Mojave, iOS 14.2 and iPadOS 14.2, watchOS 5.3.9, macOS Catalina 10.15.7 Supplemental Update, macOS Catalina 10.15.7 Update. A malicious application may be able to disclose kernel memory.

References

• https://nvd.nist.gov/vuln/detail/CVE-2020-27950
• https://support.apple.com/en-us/HT211928
• https://support.apple.com/en-us/HT211929
• https://support.apple.com/en-us/HT211931
• https://support.apple.com/en-us/HT211940
• https://support.apple.com/en-us/HT211944
• https://support.apple.com/en-us/HT211945
• https://support.apple.com/en-us/HT211946
• https://support.apple.com/en-us/HT211947
• http://packetstormsecurity.com/files/161296/XNU-Kernel-Mach-Message-Trailers-Memory-Disclosure.html
• http://seclists.org/fulldisclosure/2020/Dec/32