Yes, it seems as though in the report:
http://isec.pl/vulnerabilities/isec-0013-mremap.txt
And from the looks of mm/mremap.c
For those who might be in need to update mm/mremap.c I extracted the
patch from 2.4.24 and tested on 2.6.0.
You might just patch 2.6.0 with the exact same patch which
is in 2.6.
http://dns.toxicfilms.tv/mremap.diff
But does grsec for 2.4 guard against this? I doubt it, but I am no guru.
Does anyone knowledgeble enough have an answer?
Regards,
Maciej