A lack of CPU resource in the Linux kernel tracing module functionality in
versions prior to 5.14-rc3 was found in the way user uses trace ring buffer
in a specific way. Only privileged local users (with CAP_SYS_ADMIN
capability) could use this flaw to starve the resources causing denial of
service.

It was discovered that the tracing subsystem in the Linux kernel did not
properly keep track of per-cpu ring buffer state. A privileged attacker
could use this to cause a denial of service.