The MITRE CVE dictionary describes this issue as:
Buffer overflow in the MSGFunctionDemarshall function in winscard_svc.c in the PC/SC Smart Card daemon (aka PCSCD) in MUSCLE PCSC-Lite 1.5.4 and earlier might allow local users to gain privileges via crafted SCARD_CONTROL message data, which is improperly demarshalled. NOTE: this vulnerability exists because of an incorrect fix for CVE-2010-0407.
Find out more about CVE-2009-4902 from the
MITRE CVE dictionary dictionary and
Not vulnerable. This issue did not affect the versions of pcsc-lite as shipped with Red Hat Enterprise Linux 5.