The Fibre Channel driver for QLogic adapters in IBM AIX 6.1 and 7.1 does not properly handle DMA resource limitations, which allows local users to cause a denial of service (system hang) via vectors that generate a large amount of DMA I/O, related to a deadlock in timer processing across CPUs.
www-01.ibm.com/support/docview.wss?uid=isg1IZ94222
www-01.ibm.com/support/docview.wss?uid=isg1IZ94383
www-01.ibm.com/support/docview.wss?uid=isg1IZ94593
www-01.ibm.com/support/docview.wss?uid=isg1IZ94675
www-01.ibm.com/support/docview.wss?uid=isg1IZ96761
www.vupen.com/english/advisories/2011/0275
www.vupen.com/english/advisories/2011/0691
exchange.xforce.ibmcloud.com/vulnerabilities/67292