MIT Kerberos 5 is a suite of applications that implement the Kerberos network protocol.
The Kerberos administration daemon, and possibly other applications using the GSS-API or RPC libraries, could potentially call a function pointer in a freed heap buffer, or attempt to free an uninitialized pointer.
A remote attacker may be able to crash an affected application, or potentially execute arbitrary code with root privileges.
There is no known workaround at this time.
All MIT Kerberos 5 users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=app-crypt/mit-krb5-1.5.2"