CVE-2009-1388 (http://nvd.nist.gov/nvd.cfm?cvename=CVE-2009-1388): The ptrace_start function in kernel/ptrace.c in the Linux kernel 2.6.18 does not properly handle simultaneous execution of the do_coredump function, which allows local users to cause a denial of service (deadlock) via vectors involving the ptrace system call and a coredumping thread.
probably affects all 2.6.18 based kernels, not just the .18 base