An insufficient fix for CVE-2019-6205 means XNU vm_map_copy optimization which requires atomicity still is not atomic.
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XNU vm_map_copy optimization which requires atomicity is not atomic. This violates the semantics of mach message OOL memory, and leads to TOCTOU issues which can lead to memory corruption.
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Apple Security Advisory 2019-1-22-2 - macOS Mojave 10.14.3, Security Update 2019-001 High Sierra, Security Update 2019-001 Sierra are now available and addresses buffer overflow, code execution, and denial of service vulnerabilities.
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Apple Security Advisory 2019-1-22-4 - tvOS 12.1.2 is now available and addresses buffer overflow, code execution, and cross site scripting vulnerabilities.
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Apple Security Advisory 2019-1-22-1 - iOS 12.1.3 is now available and addresses buffer overflow, code execution, cross site scripting, and denial of service vulnerabilities.
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