The answer is: YOU CAN'T.
Alain Knaff, who is the writer of linux kernel says; And i Quote
This is Linux, not Windows, and Linux doesn’t have any bugs which
would allow you to do this. There is a reason, after all, why more and more >people are ditching
Windows, and using Linux. Ofcourse, you could always try manipulating
the hardware (blocking the CPU fan to make the CPU overheat, jiggling
the memory SIMMs, etc.), but I guess that wouldn’t really count…
Moreover u can crash your kernel from user mode in the earlier kerenel versions 2.0 etc . From user mode if u send the ping packet more than 653476 but conditional to earlier version of Linux kernel..current kernels have been resolved this Bug.
Also that A null pointer dereference flaw was discovered in the Linux kernel’s SCTP implementation when ASCONF is used. A remote attacker could exploit this flaw to cause a denial of service (system crash) via a malformed INIT chunk one more, A race condition with MMIO and PIO transactions in the KVM (Kernel Virtual
Machine) subsystem of the Linux kernel was discovered. A guest OS user
could exploit this flaw to cause a denial of service (guest OS crash) via a
specially crafted application
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solved Case where Linux can be made to Crash or Hang in CPL3 (User Mode) without Root Acces? [closed]