The Linux kernel before 4.4.1 allows local users to bypass file-descriptor limits and cause a denial of service by sending each descriptor over a UNIX socket before closing it, related to net/unix/af_unix.c and net/unix/garbage.c. A race condition in the tty_ioctl function in drivers/tty/tty_io.c in the Linux kernel through 4.4.1 was found that allows local users to obtain sensitive information from kernel memory or cause a denial of service by making a TIOCGETD ioctl call during processing of a TIOCSETD ioctl call. A privilege-escalation vulnerability was discovered in the Linux kernel built with User Namespace support. The flaw occurred when the ptrace system call was used on a root-owned process to enter a user namespace. A privileged namespace user could exploit this flaw to potentially escalate their privileges on the system, outside the original namespace. net/sctp/sm_sideeffect.c in the Linux kernel before 4.3 does not properly manage the relationship between a lock and a socket, which allows local users to cause a denial of service via a crafted sctp_accept call