Zephyr 4.5.0 (Working Draft)

We are pleased to announce the release of Zephyr version 4.5.0.

Major enhancements with this release include:

An overview of the changes required or recommended when migrating your application from Zephyr v4.4.0 to Zephyr v4.5.0 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:

• CVE 2026-8718 Under embargo until 2026-08-08

• CVE 2026-9263 Under embargo until 2026-06-28

API Changes

Removed APIs and options

• The following deprecated networking options and APIs have been removed:

  • CONFIG_NET_TC_SKIP_FOR_HIGH_PRIO

  • CONFIG_NET_SOCKETS_POLL_MAX

  • net_ipv6_set_hop_limit()

  • net_if_ipv4_get_netmask()

  • net_if_ipv4_set_netmask()

  • net_if_ipv4_set_netmask_by_index()

  • openthread_state_changed_cb_register()

  • openthread_state_changed_cb_unregister()

  • openthread_start()

  • openthread_api_mutex_lock()

  • openthread_api_mutex_try_lock()

  • openthread_api_mutex_unlock()

  • struct openthread_state_changed_cb

  • TLS_CREDENTIAL_SERVER_CERTIFICATE

Deprecated APIs and options

• DMIC

  • The _dmic_ops struct has been deprecated. DMIC drivers are now expected to use the DEVICE_API macro to declare their driver API.

• LoRa

  • Renamed lora_recv_duty_cycle() to lora_recv_duty_cycle_async() to be consistent with the existing sync/async naming convention.

• Nordic

  • The internal SoC platform Kconfig symbols NRF_PLATFORM_HALTIUM and NRF_PLATFORM_LUMOS have been deprecated. Use specific SOC_SERIES_* Kconfig options instead.

  • The sysbuild Kconfig option SB_CONFIG_NRF_HALTIUM_GENERATE_UICR has been renamed to SB_CONFIG_NRF_GENERATE_UICR.

  • The Nordic SoC headers <haltium_power.h> and <haltium_pm_s2ram.h> have been renamed to <soc_power.h> and <soc_pm_s2ram.h> respectively.

• Ring buffer

  • The ring buffer item API (ring_buf_item_init(), ring_buf_item_put(), ring_buf_item_get(), ring_buf_item_space_get()) has been deprecated in favor of sys_ringq (see sys_ringq Data Structure).

New APIs and options

• Audio

  • pcm_stream_cfg.gain_db

• LoRa

  • lora_recv_duty_cycle()

  • lora_recv_duty_cycle_async()

• sys_ringq (see sys_ringq Data Structure)

New Boards

• Arduino

  • Arduino Nesso N1 (arduino_nesso_n1)

• Seeed

  • Seeed Wio Tracker L1 (wio_tracker_l1)

New Shields

New Drivers

• GPIO

  • Diodes/Pericom PI4IOE5V6408 8-bit I2C-bus I/O expander (diodes,pi4ioe5v6408).

New Samples

• MCTP I2C GPIO Top Node Sample (renamed from mctp_i2c_bus_owner)

• MCTP I3C Top Node Sample (renamed from mctp_i3c_bus_owner)

Libraries / Subsystems

• DFU

  • Added CONFIG_IMG_CUSTOM_SECTOR_SIZE to allow MCUboot to use a different sector size for reducing the swap-using-offset status area size.

• LoRa / LoRaWAN

  • Added a native LoRaWAN backend (CONFIG_LORA_MODULE_BACKEND_NATIVE) that implements LoRaWAN 1.0.x Class A directly on top of the LoRa radio driver, without the Semtech LoRaMac-node dependency. Currently supports the EU868 region.

  • lora_modem_config.sync_word

Devicetree

• DT_NODELABEL_C_TOKEN

• DT_NODELABEL_C_TOKEN_BY_IDX

Other notable changes