Oracle are asking customers to download CPU July 2005 for 10.1.0.x again as there is a problem
I was trying to find out if this email can be backed up from other sources. I checked the advisory and found that no updates had been applied to the actual advisory, the same with the security alerts page on OTN. I also checked out Metalink headlines and the advisory there on Metalink, again no updates referring to this issue. When I checked out the actual patches on Metalink the last update dates where 14 July and 13 july. So I guess this email can be confirmed by this fact.
If you have downloaded the patches for 10.1.0.x before 14 July then you should check that you have the correct versions and re-apply newer ones if necessary.