The KVM subsystem in the Linux kernel through 4.2.6, and Xen 4.3.x through 4.6.x, allows guest OS users to cause a denial of service (host OS panic or hang) by triggering many #DB (aka Debug) exceptions, related to svm.c.
Linux Kernel 6.x/5.15 LTS
DDoS
CVE-2015-8104
NVD
Refer to CVE-2015-8104 NVD advisory