The skge driver 1.5 in Linux kernel 2.6.15 on Ubuntu does not properly use the spin_lock and spin_unlock functions, which allows remote attackers to cause a denial of service (machine crash) via a flood of network traffic.
Ubuntu Security Notice 578-1 - A large amount of denial of service, buffer overflow, and privilege escalation vulnerabilities have been addressed in the linux-source-2.6.15 package.