Can other process in node use the cpu which has already been assigned to pod?

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Cluster information:

Kubernetes version: 1.19.5
Cloud being used: (put bare-metal if not on a public cloud) bare-metal
Installation method: n/a
Host OS: centos
CNI and version: calico
CRI and version: docker

In a k8s cluster, in one of node, if it has 80 cpu and 74 are used for pod, like this:

kubectl describe node xxxx-0|grep "Capacity\|Allocatable" -A 1
Capacity:
  cpu:                80
--
Allocatable:
  cpu:                74

If the pod in this node has requested 64 cpu, like this:

kubectl describe node xxxx|grep "Allocated resources" -A 4
Allocated resources:
  (Total limits may be over 100 percent, i.e., overcommitted.)
  Resource                   Requests        Limits
  --------                   --------        ------
  cpu                        64356m (86%)    83140m (112%)

And if I run some other task in this node, how many cpu can be used for this taks? In my test, if I run a stress tool which will cost cpu, it only can be run in 6 CPU. (Capacity 80 - Allocatable 74)? For the assigned 64 cpu for pod, even the pod is idle(doesn’t really use it), can my task in node(stress tool) use these 64 cpu?