`PodSecurity` replaces the deprecated `PodSecurityPolicy` admission controller.
`PodSecurity` is an admission controller that enforces Pod Security Standards on Pods in a Namespace based on specific namespace labels that set the enforcement level.
In 1.23, the `PodSecurity` feature gate is enabled by default.

### Container Runtime Interface (CRI) v1 is default

The Kubelet now supports the CRI `v1` API, which is now the project-wide default.

- Fix raw block mode CSI `NodePublishVolume` stage miss pod info. ([#99069](https://github.com/kubernetes/kubernetes/pull/99069), [@phantooom](https://github.com/phantooom))
- Fix resource enforcement when using systemd cgroup driver ([#102147](https://github.com/kubernetes/kubernetes/pull/102147), [@kolyshkin](https://github.com/kolyshkin))

#### Node

- The deprecated kubelet security controls `AllowPrivileged`, `HostNetworkSources`, `HostPIDSources`, and `HostIPCSources` have been removed. Enforcement of these restrictions should be done through admission control (such as `PodSecurityPolicy`) instead. ([#77820](https://github.com/kubernetes/kubernetes/pull/77820), [@dims](https://github.com/dims))

* 'none' can now be specified in KubeletConfiguration.EnforceNodeAllocatable (--enforce-node-allocatable) to explicitly disable enforcement. ([#59515](https://github.com/kubernetes/kubernetes/pull/59515), [@mtaufen](https://github.com/mtaufen))

  Added `validationActions` to `ValidatingAdmissionPolicyBinding`, enabling validation failures to be handled by any combination of the warn, audit and deny enforcement actions. ([#115973](https://github.com/kubernetes/kubernetes/pull/115973), [@jpbetz](https://github.com/jpbetz))

- Added enforcement of an upper cost bound for DRA evaluations of CEL. The API server and scheduler now enforce an upper bound on the cost and runtime steps required for evaluating a CEL expression. ([#128101](https://github.com/kubernetes/kubernetes/pull/128101),...

- Kube-apiserver: when the Alpha `UserNamespacesPodSecurityStandards` feature gate is enabled, Pod Security Admission enforcement of the baseline policy now allows `procMount: Unmasked` for user namespace pods that set `hostUsers: false`. ([#126163](https://github.com/kubernetes/kubernetes/pull/126163), [@haircommander](https://github.com/haircommander))

* Fixed regression in initial kubectl exec terminal dimensions ([#51127](https://github.com/kubernetes/kubernetes/pull/51127), [@chen-anders](https://github.com/chen-anders))

* Fixed a bug in the API server watch cache, which could cause a missing watch event immediately after cache initialization. ([#49992](https://github.com/kubernetes/kubernetes/pull/49992), [@liggitt](https://github.com/liggitt))

- Fix removing pods from podTopologyHints mapping ([#101892](https://github.com/kubernetes/kubernetes/pull/101892), [@aheng-ch](https://github.com/aheng-ch)) [SIG Node]