doc: releases: Add release notes for Zephyr 2.2.1

:orphan:

.. _zephyr_2.2:

.. _zephyr_2.2.1:

Zephyr 2.2.1

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This is a maintenance release for Zephyr 2.2 with fixes.

See :ref:`zephyr_2.2.0` for the previous version release notes.

Security Vulnerability Related

******************************

The following security vulnerabilities (CVE) were addressed in this release:

  * Fix CVE-2020-10028

  * Fix CVE-2020-10060

  * Fix CVE-2020-10063

  * Fix CVE-2020-10066

More detailed information can be found in:

https://docs.zephyrproject.org/latest/security/vulnerabilities.html

Issues Fixed

************

These GitHub issues were addressed since the previous 2.2.0 tagged

release:

* :github:`23494` - Bluetooth: LL/PAC/SLA/BV-01-C fails if Slave-initiated Feature Exchange is disabled

* :github:`23485` - BT: host: Service Change indication sent regardless of whether it is needed or not.

* :github:`23482` - 2M PHY + DLE and timing calculations on an encrypted link are wrong

* :github:`23070` - Bluetooth: controller: Fix ticker implementation to avoid catch up

* :github:`22967` - Bluetooth: controller: ASSERTION FAIL on invalid packet sequence

* :github:`24183` - [v2.2] Bluetooth: controller: split: Regression slave latency during connection update

* :github:`23805` - Bluetooth: controller: Switching to non conn adv fails for Mesh LPN

* :github:`24086` - Bluetooth: SMP: Existing bond deleted on pairing failure

* :github:`24211` - [v2.2.x] lib: updatehub: Not working on Zephyr 2.x

* :github:`24601` - Bluetooth: Mesh: Config Client's net_key_status pulls two key indexes, should pull one.

* :github:`25067` - Insufficient ticker nodes for vendor implementations

* :github:`25350` - Bluetooth: controller: Data transmission delayed by slave latency

* :github:`25483` - Bluetooth: controller: split: feature exchange not conform V5.0 core spec

* :github:`25478` - settings_runtime_set() not populating bt/cf

* :github:`25447` - cf_set() returns 0 when no cfg is available

.. _zephyr_2.2.0:

Zephyr 2.2.0

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