Perhaps you were asking about previously installed packages linked
against a vulnerable libc, for example? Again, those packages remain
vulnerable, until you upgrade to the new version, that links against the
fixed libc.
Why can't the already-installed binaries run a new shared libc version?
Are you using static linking?
--
Dr Richard Stallman
President, Free Software Foundation
51 Franklin St
Boston MA 02110
USA
www.fsf.org www.gnu.org
Skype: No way! That's nonfree (freedom-denying) software.
Use Ekiga or an ordinary phone call