- Kubeadm: removed the restriction that the `ca.crt` can only contain one certificate. If there is more than one certificate in the `ca.crt` file, kubeadm will pick the first one by default. ([#107327](https://github.com/kubernetes/kubernetes/pull/107327), [@SataQiu](https://github.com/SataQiu))

This release contains changes that address the following vulnerabilities:

### CVE-2022-3162: Unauthorized read of Custom Resources

A security issue was discovered in Kubernetes where users authorized to list or watch one type of namespaced custom resource cluster-wide can read custom resources of a different type in the same API group they are not authorized to read.

**Affected Versions**:
  - kube-apiserver v1.25.0 - v1.25.3

- In the event that more than one IngressClass is designated "default", the DefaultIngressClass admission controller will choose one rather than fail. ([#110974](https://github.com/kubernetes/kubernetes/pull/110974), [@kidddddddddddddddddddddd](https://github.com/kidddddddddddddddddddddd)) [SIG Network]

This release contains changes that address the following vulnerabilities:

### CVE-2022-3162: Unauthorized read of Custom Resources

A security issue was discovered in Kubernetes where users authorized to list or watch one type of namespaced custom resource cluster-wide can read custom resources of a different type in the same API group they are not authorized to read.

**Affected Versions**:
  - kube-apiserver v1.25.0 - v1.25.3

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- kubeadm: ensured that a variety of API server requests were retried during "init", "join", "upgrade", "reset" workflows. Prior to this change, some API server requests, such as creating or updating ConfigMaps, were "one-shot" - i.e., they could fail if the API server dropped connectivity for a very short period of time.
   ([#123271](https://github.com/kubernetes/kubernetes/pull/123271), [@neolit123](https://github.com/neolit123))

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