FreeBSD atkbd SETFKEY Ioctl Privilege Escalation Exploit Update

Incorrect signedness comparison in the ioctl handler of the atkbd keyboard driver in the FreeBSD kernel can be leveraged by a local unprivileged user to overwrite a portion of the kernel memory, thus allowing the attacker to gain root privileges on the affected system.



This update improves the checking of preconditions before launching the attack.