- Kubelet might fail to restart if an existing flexvolume mounted pvc contains a large number of directories, or is full. [#75019](https://github.com/kubernetes/kubernetes/pull/75019)

## Urgent Upgrade Notes

### (No, really, you MUST read this before you upgrade)

- kube-apiserver:

  // Must be an octal value between 0000 and 0777 or a decimal value between 0 and 511.
  // YAML accepts both octal and decimal values, JSON requires decimal values for mode bits.
  // Defaults to 0644.
  // Directories within the path are not affected by this setting.
  // This might be in conflict with other options that affect the file
  // mode, like fsGroup, and the result can be other mode bits set.
  // +optional

### CVE-2021-25741: Symlink Exchange Can Allow Host Filesystem Access

A security issue was discovered in Kubernetes where a user may be able to
create a container with subpath volume mounts to access files &
directories outside of the volume, including on the host filesystem.

**Affected Versions**:
  - kubelet v1.22.0 - v1.22.1
  - kubelet v1.21.0 - v1.21.4
  - kubelet v1.20.0 - v1.20.10
  - kubelet <= v1.19.14

- Generating informers for packages in directories containing dots in their name is broken. This will be fixed in v1.16.1. ([#82860](https://github.com/kubernetes/kubernetes/issues/82860))

* It is now posible to use flexVolumes to bind mount directories and files. ([#50596](https://github.com/kubernetes/kubernetes/pull/50596), [@adelton](https://github.com/adelton))

### CVE-2021-25741: Symlink Exchange Can Allow Host Filesystem Access

A security issue was discovered in Kubernetes where a user may be able to
create a container with subpath volume mounts to access files &
directories outside of the volume, including on the host filesystem.

**Affected Versions**:
  - kubelet v1.22.0 - v1.22.1
  - kubelet v1.21.0 - v1.21.4
  - kubelet v1.20.0 - v1.20.10
  - kubelet <= v1.19.14

- Kubelet's deprecated `...

- Kubelet now cleans up orphaned volume directories automatically ([#95301](https://github.com/kubernetes/kubernetes/pull/95301), [@lorenz](https://github.com/lorenz)) [SIG Node and Storage]

* Fixes issue where subpath volume content was deleted during orphaned pod cleanup for Local volumes that are directories (and not mount points) on the root filesystem. ([#72291](https://github.com/kubernetes/kubernetes/pull/72291), [@msau42](https://github.com/msau42))

*   `kubectl cp` can now copy a remote file into a local directory. ([#46762](https://github.com/kubernetes/kubernetes/pull/46762),[ @bruceauyeung](https://github.com/bruceauyeung))
*   `kubectl cp` now honors destination names for directories. A complete directory is now copied; in previous versions only the file contents were copied. ([#51215](https://github.com/kubernetes/kubernetes/pull/51215),[ @juanvallejo](https://github.com/juanvallejo))