MadWifi, when Ad-Hoc mode is used, allows remote attackers to cause a denial of service (system crash) via unspecified vectors that lead to a kernel panic in the ieee80211_input function, related to "packets coming from a 'malicious' WinXP system."
MadWifi before 0.9.3 does not properly handle reception of an AUTH frame by an IBSS node, which allows remote attackers to cause a denial of service (system crash) via a certain AUTH frame.