A flaw possibility of memory leak in the Linux kernel cpu_entry_area mapping of X86 CPU data to memory was found in the way user can guess location of exception stack(s) or other important data. A local user could use this flaw to get access to some important data with expected location in memory.
https://git.kernel.org/linus/97e3d26b5e5f371b3ee223d94dd123e6c442ba80