CVE-2009-1238: Concurrent Execution using Shared Resource with Improper Synchronization

Race condition in the HFS vfs sysctl interface in XNU 1228.8.20 and earlier on Apple Mac OS X 10.5.6 and earlier allows local users to cause a denial of service kernel memory corruption by simultaneously executing the same HFSSETPKGEXTENSIONS code path in multiple threads, which is problematic...