Cisco Security released a patch today that fixes a vulnerability in its Intrusion Prevention System. 
Cisco says that its IPSs "that have gigabit network interfaces installed and are deployed in inline mode contain a denial of service vulnerability in the handling of jumbo Ethernet frames. This vulnerability may lead to a kernel panic that requires a power cycle to recover platform operation." If the IPS is deployed in "promiscuous mode" only or if it is not using a gigabit NIC aren't vulnerable.
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