- Kube-apiserver: Fixed a possible panic validating a custom resource whose `CustomResourceDefinition` indicates a status subresource exists, but which does not define a `status` property in the `openAPIV3Schema`. ([#133721](https://github.com/kubernetes/kubernetes/pull/133721), [@fusida](https://github.com/fusida)) [SIG API Machinery, Apps, Architecture, Auth, Autoscaling, CLI,...

- In clusters where the DryRun feature is enabled, dry-run requests...

- Kube-apiserver: fix a possible panic validating a custom resource whose CustomResourceDefinition indicates a status subresource exists, but which does not define a `status` property in the `openAPIV3Schema` ([#135362](https://github.com/kubernetes/kubernetes/pull/135362), [@fusida](https://github.com/fusida)) [SIG API Machinery]

- Added counter metric "apiserver_request_self" to count API server self-requests with labels for verb, resource, and subresource. ([#94288](https://github.com/kubernetes/kubernetes/pull/94288), [@LogicalShark](https://github.com/LogicalShark)) [SIG API Machinery, Auth, Instrumentation and Scheduling]

* Addresses vSphere Volume Attach limits ([#29881](https://github.com/kubernetes/kubernetes/pull/29881), [@dagnello](https://github.com/dagnello))
* allow restricting subresource access ([#29988](https://github.com/kubernetes/kubernetes/pull/29988), [@deads2k](https://github.com/deads2k))

* The SubjectAccessReview API passes subresource and resource name information to the authorizer to answer authorization queries. ([#40935](https://github.com/kubernetes/kubernetes/pull/40935), [@liggitt](https://github.com/liggitt))

The merged fix enforces validation against the proxying address for a Node. In some cases, the fix can break clients that depend on the `nodes/proxy` subresource, specifically if a kubelet advertises a localhost or link-local address to the Kubernetes control plane. Configuring an egress proxy for egress to the cluster network can also mitigate this vulnerability.

**Affected Versions**:

### Authorization
* The authorization.k8s.io API group was promoted to v1 ([#40709](https://github.com/kubernetes/kubernetes/pull/40709), [@liggitt](https://github.com/liggitt))
* The SubjectAccessReview API now passes subresource and resource name information to the authorizer to answer authorization queries. ([#40935](https://github.com/kubernetes/kubernetes/pull/40935), [@liggitt](https://github.com/liggitt))

### Autoscaling

- Added `client-go` support for upgrading subresource fields from client-side to server-side management. ([#123484](https://github.com/kubernetes/kubernetes/pull/123484), [@erikgb](https://github.com/erikgb))

  - `spec.version` is removed in v1; use `spec.versions` instead
  - `spec.validation` is removed in v1; use `spec.versions[*].schema` instead
  - `spec.subresources` is removed in v1; use `spec.versions[*].subresources` instead
  - `spec.additionalPrinterColumns` is removed in v1; use `spec.versions[*].additionalPrinterColumns` instead