A race condition was addressed with improved locking. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, watchOS 7.3, tvOS 14.4, iOS 14.4 and iPadOS 14.4. A malicious application may be able to elevate privileges. Apple is aware of a report that this issue may have been actively exploited..
The product does not properly acquire or release a lock on a resource, leading to unexpected resource state changes and behaviors.
Name | Vendor | Start Version | End Version |
---|---|---|---|
Mac_os_x | Apple | 10.15 | * |
Mac_os_x | Apple | 10.14 | * |
Mac_os_x | Apple | 10.14.6 | 10.14.6 |
Mac_os_x | Apple | 10.14.6 | 10.14.6 |
Mac_os_x | Apple | 10.14.6 | 10.14.6 |
Mac_os_x | Apple | 10.14.6 | 10.14.6 |
Mac_os_x | Apple | 10.14.6 | 10.14.6 |
Mac_os_x | Apple | 10.14.6 | 10.14.6 |
Mac_os_x | Apple | 10.14.6 | 10.14.6 |
Mac_os_x | Apple | 10.14.6 | 10.14.6 |
Mac_os_x | Apple | 10.14.6 | 10.14.6 |
Mac_os_x | Apple | 10.14.6 | 10.14.6 |
Mac_os_x | Apple | 10.14.6 | 10.14.6 |
Mac_os_x | Apple | 10.14.6 | 10.14.6 |
Mac_os_x | Apple | 10.14.6 | 10.14.6 |
Mac_os_x | Apple | 10.15.7 | 10.15.7 |
Mac_os_x | Apple | 10.15.7 | 10.15.7 |
Mac_os_x | Apple | 10.14.6 | 10.14.6 |
Ipados | Apple | * | * |
Iphone_os | Apple | * | * |
Tvos | Apple | * | * |
Watchos | Apple | * | * |
Macos | Apple | 11.0 | * |
Locking is a type of synchronization behavior that ensures that multiple independently-operating processes or threads do not interfere with each other when accessing the same resource. All processes/threads are expected to follow the same steps for locking. If these steps are not followed precisely - or if no locking is done at all - then another process/thread could modify the shared resource in a way that is not visible or predictable to the original process. This can lead to data or memory corruption, denial of service, etc.