Ubuntu Security Notice 2563-1 – Sun Baoliang discovered a use after free flaw in the Linux kernel’s SCTP (Stream Control Transmission Protocol) subsystem during INIT collisions. A remote attacker could exploit this flaw to cause a denial of service (system crash) or potentially escalate their privileges on the system. Marcelo Leitner discovered a flaw in the Linux kernel’s routing of packets to too many different dsts/too fast. A remote attacker can exploit this flaw to cause a denial of service (system crash). Various other issues were also addressed.