### CVE-2021-25735: Validating Admission Webhook does not observe some previous fields

A security issue was discovered in kube-apiserver that could allow node
updates to bypass a Validating Admission Webhook. You are only affected
by this vulnerability if you run a Validating Admission Webhook for Nodes
that denies admission based at least partially on the old state of the
Node object.

* kubectl get ingress output remove rules ([#26684](https://github.com/kubernetes/kubernetes/pull/26684), [@AdoHe](https://github.com/AdoHe))
* AWS kube-up: Remove SecurityContextDeny admission controller (to mirror GCE) ([#25381](https://github.com/kubernetes/kubernetes/pull/25381), [@zquestz](https://github.com/zquestz))

### CVE-2021-25735: Validating Admission Webhook does not observe some previous fields

A security issue was discovered in kube-apiserver that could allow node
updates to bypass a Validating Admission Webhook. You are only affected
by this vulnerability if you run a Validating Admission Webhook for Nodes
that denies admission based at least partially on the old state of the
Node object.

- Replaced deprecated package `k8s.io/utils/pointer` with `k8s.io/utils/ptr` for the pod-security-admission admissiontests. ([#132742](https://github.com/kubernetes/kubernetes/pull/132742), [@PatrickLaabs](https://github.com/PatrickLaabs))

secrets field. Kubernetes clusters are only affected if the ServiceAccount admission plugin and the `kubernetes.io/enforce-mountable-secrets` annotation are used together with ephemeral containers.

**Note**: This only impacts the cluster if the ServiceAccount admission plugin is used (most cluster should have this on by default as recommended in https://kubernetes.io/docs/reference/access-authn-authz/admission-controllers/#serviceaccount), the `kubernetes.io/enforce-mountable-secrets`...

  - [Important Security Information](#important-security-information-2)
    - [CVE-2024-3177: Bypassing mountable secrets policy imposed by the ServiceAccount admission plugin](#cve-2024-3177-bypassing-mountable-secrets-policy-imposed-by-the-serviceaccount-admission-plugin)
  - [Changes by Kind](#changes-by-kind-11)
    - [Feature](#feature-7)
    - [Bug or Regression](#bug-or-regression-8)
  - [Dependencies](#dependencies-11)

- Removed admission plugin `PersistentVolumeLabel`. Please use https://github.com/kubernetes-sigs/cloud-pv-admission-labeler instead if you need a similar functionality. ([#124505](https://github.com/kubernetes/kubernetes/pull/124505), [@jsafrane](https://github.com/jsafrane)) [SIG API Machinery, Auth and Storage]...

### Failing Test

- Fixed generic ephemeal volumes with OwnerReferencesPermissionEnforcement admission plugin enabled. ([#101186](https://github.com/kubernetes/kubernetes/pull/101186), [@jsafrane](https://github.com/jsafrane)) [SIG Auth and Storage]

- The deprecated `SecurityContextDeny` admission plugin, which has been deprecated since `v1.27`, has been removed. It is recommended to use the Pod Security Admission plugin instead, which has been available since v1.25. Refer to the [Kubernetes documentation](https://kubernetes.io/docs/reference/access-authn-authz/admission-controllers/#securitycontextdeny) for more information.

This release contains changes that address the following vulnerabilities:

### CVE-2025-5187: Nodes can delete themselves by adding an OwnerReference