Unspecified vulnerability in the IBM Asynchronous I/O (aka AIO or libibmaio) library in the Java Message Service (JMS) component in IBM WebSphere Application Server (WAS) 6.1.x before 6.1.0.17 on AIX 5.3 allows attackers to cause a denial of service (daemon crash) via vectors related to the aio_getioev2 and getEvent methods.