This functionality appears to have been introduced in linux 2.6.33 with commit a...

		sn on Oct 5, 2016 \| parent \| context \| favorite \| on: Linux Kernel Use-After-Free Remote Code Execution ... This functionality appears to have been introduced in linux 2.6.33 with commit a2e272554 . Looking at http://vault.centos.org/6.8/updates/Source/SPackages/kernel-... it looks like RedHat backported this function but has not applied the fix.