Zephyr 4.2.0 (Working Draft)

We are pleased to announce the release of Zephyr version 4.2.0.

Major enhancements with this release include:

An overview of the changes required or recommended when migrating your application from Zephyr v4.1.0 to Zephyr v4.2.0 can be found in the separate migration guide.

The following sections provide detailed lists of changes by component.

Security Vulnerability Related

The following CVEs are addressed by this release:

More detailed information can be found in: https://docs.zephyrproject.org/latest/security/vulnerabilities.html

API Changes

Removed APIs and options

• Removed the deprecated the net_buf_put() and net_buf_get() API functions.

• Removed the deprecated include/zephyr/net/buf.h header file.

Deprecated APIs and options

• The scheduler Kconfig options CONFIG_SCHED_DUMB and CONFIG_WAITQ_DUMB were renamed and deprecated. Use CONFIG_SCHED_SIMPLE and CONFIG_WAITQ_SIMPLE instead.

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New APIs and options

• Bluetooth

  • Audio

    • BT_BAP_ADV_PARAM_CONN_QUICK

    • BT_BAP_ADV_PARAM_CONN_REDUCED

    • BT_BAP_CONN_PARAM_SHORT_7_5

    • BT_BAP_CONN_PARAM_SHORT_10

    • BT_BAP_CONN_PARAM_RELAXED

    • BT_BAP_ADV_PARAM_BROADCAST_FAST

    • BT_BAP_ADV_PARAM_BROADCAST_SLOW

    • BT_BAP_PER_ADV_PARAM_BROADCAST_FAST

    • BT_BAP_PER_ADV_PARAM_BROADCAST_SLOW

  • Host

    • bt_le_get_local_features()

    • bt_le_bond_exists()

    • bt_br_bond_exists()

• Display

  • display_clear()

    • LE Connection Subrating is no longer experimental.

New Boards

New Drivers

New Samples

• Stepper

Other notable changes