Ubuntu Security Notice 3641-1 - Nick Peterson discovered that the Linux kernel did not properly handle debug exceptions following a MOV/POP to SS instruction. A local attacker could use this to cause a denial of service. This issue only affected the amd64 architecture. Andy Lutomirski discovered that the KVM subsystem of the Linux kernel did not properly emulate the ICEBP instruction following a MOV/POP to SS instruction. A local attacker in a KVM virtual machine could use this to cause a denial of service or possibly escalate privileges inside of the virtual machine. This issue only affected the i386 and amd64 architectures. Various other issues were also addressed.
54c635a827000ad1e9720e3b153dc5b8af85ba11bc41d5f1f952f2e981d32393