A vulnerability has been discovered and corrected in krb5:

The process_tgs_req function in do_tgs_req.c in the Key Distribution
Center (KDC) in MIT Kerberos 5 (aka krb5) 1.9 through 1.9.2 allows
remote authenticated users to cause a denial of service (NULL pointer
dereference and daemon crash) via a crafted TGS request that triggers
an error other than the KRB5_KDB_NOENTRY error (CVE-2011-1530).

The updated packages have been patched to correct this issue.