1. Download the two necessary archives - SAPEXE.SAR and SAPEXEDB.SAR - from SAP MarketPlace. There files can be found at http://service.sap.com/patches. Be careful that your Basis level is high enough to use the patch level of the files you download. For example, if your SAP instance is on Basis level 39 and the description of one of the SAPEXE.SAR files is Stack 42, you need to download a SAPEXE.SAR of a lower level.
2. Once both files have been downloaded, log on to the UNIX server as <sid>adm and copy them up to a directory on the UNIX server - I use one called /usr/sap/trans/NewKernel. unCAR the files with SAPCAR command “sapcar -xvf “SAPEXE*.SAR”.
3. As <sid>adm, stop the SAP instance. Log on as ora<sid> and stop the TNS listener, and log on as root and stop saposcol.
4. Make a backup of your run directory before patching. I usually create a /usr/sap/<SID>/SYS/exe/backup_run and copy all the files in /usr/sap/<SID>/SYS/exe/run to it.