kernel/omap/drivers/rpmsg/rpmsg_omx.c in the kernel component in Amazon Kindle Fire HD(3rd) Fire OS 4.5.5.3 allows attackers to inject a crafted argument via the argument of an ioctl on device file /dev/rpmsg-omx1 with the command 3221772291, and cause a kernel crash.
https://github.com/datadancer/HIAFuzz/blob/master/CVE-Advisory.md
https://github.com/datadancer/HIAFuzz/blob/master/CVE-2018-11020.md