Stack-based buffer overflow in the get_matching_model_microcode function in arch/x86/kernel/cpu/microcode/intel_early.c in the Linux kernel before 4.0 allows context-dependent attackers to gain privileges by constructing a crafted microcode header and leveraging root privileges for write access to the initrd.
Exploitability
AV:LAC:MAu:NImpact
C:CI:CA:C6.9/AV:L/AC:M/Au:N/C:C/I:C/A:C