http://rhn.redhat.com/errata/RHBA-2005-085.html refers.

The following updated files have been uploaded and are currently syncing to the mirrors:

x86_64:
/updates/x86_64/RPMS/libaio-0.3.103-3.i386.rpm
/updates/x86_64/RPMS/libaio-0.3.103-3.x86_64.rpm
/updates/x86_64/RPMS/libaio-devel-0.3.103-3.x86_64.rpm

source:
/updates/SRPMS/libaio-0.3.103-3.src.rpm

you can obtain this update with the command:

yum update libaio.i386 libaio.x86_64 libaio-devel