Buffer overflow in OSF Distributed Computing Environment (DCE) security demon (secd) in IRIX 6.4 and earlier allows attackers to cause a denial of service via a long principal, group, or organization.
The asynchronous I/O facility in 4.4 BSD kernel does not check user credentials when setting the recipient of I/O notification, which allows local users to cause a denial of service by using certain ioctl and fcntl calls to cause the signal to be sent to an arbitrary process ID.