Hi Connie and Troy, in the latest kernel update for SL5 there is kernel-headers-2.6.18-194.8.1.el5.x86_64.rpm in x86_64/updates/security/ and no kernel-headers-2.6.18-194.8.1.el5.i386.rpm in i386/updates/security/. It doesn't break yum update on i386, but it seems to me i386 kernel-headers for this kernel should be included in the update too.
-- Best regards, Valery Mitsyn
