CVE-2019-19602: Improper Restriction of Operations within the Bounds of a Memory Buffer

fpregsstatevalid in arch/x86/include/asm/fpu/internal.h in the Linux kernel before 5.4.2, when GCC 9 is used, allows context-dependent attackers to cause a denial of service memory corruption or possibly have unspecified other impact because of incorrect fpufpregsownerctx caching, as demonstrated...