Download Latest Version Zephyr 4.2.1 source code.tar.gz (98.3 MB)
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This is a bugfix release for Zephyr 4.2.0. The following issues are addressed by this release:

  • [#96197] gPTP sample does not boot with NUCLEO-H563ZI
  • [#92393] LIS2DUX12 setting incorrect ODR configuration
  • [#93011] stm32u0: interrupt vectors for lpuart1 and lpuart2 are wrong in device tree
  • [#93220] Twister tests with coverage enabled crash during startup
  • [#93265] Stm32u5x: clock disable in sleep mode fix causing USB HS device initialization stalls
  • [#93342] doc: Documentation issue in 'connectivity/networking/api/tftp'
  • [#93350] net: tcp: keep-alive "pings" are no longer acknowledged with v4.2.0
  • [#93364] tests/subsys/llext fails after tagging 4.2
  • [#93424] Missing break after IPV6_MULTICAST_IF option processing
  • [#93445] STM32U535/545: dtc error for node wkup-pin@8 referencing non-existent port gpiof
  • [#93519] drivers: nxp_lpspi: Large performance degradation
  • [#93594] Nicla Vision has bad I2C address for VL53L1X sensor
  • [#93611] doc: Documentation issue in 'releases/release-notes-4.2'
  • [#93790] drivers: console: posix_arch_console: build warning with CONFIG_PRINTK=n
  • [#93792] USB samples not working on max32690evkit
  • [#93831] drivers: can: nrf: fix invalid pointer leading to undef behavior
  • [#93839] I3C: STM32: Has a Mutex deadlock on DAA Failure
  • [#94000] EXT2 fs_stat on mount point fails with a NULL pointer dereference.
  • [#94047] Shell device name tab completion for regulator parents show incorrect names
  • [#94063] SPI loopback tests failing on MAX32 SoCs.
  • [#94083] stm32: u3: low clock frequency for the RNG periphera
  • [#94093] Build error when OCRAM node is disabled in device tree (status = "disabled") [NXP RT1061]
  • [#94107] ppp link-layer address configuration is wrong
  • [#94325] iar: incorrect assembler optimzation flag
  • [#94473] LVGL Widgets Demo stopped working in v4.1 on mimxrt1060_evk@A
  • [#94702] Locally Administered Address (LAA) bit missing for STM32 ethernet driver
  • [#94703] Locally Administered Address (LAA) bit set on wrong index for NXP i.MX ethernet driver
  • [#94774] modules/picolibc: Roll back unnecessary changes, synchronize with SDK 0.17.4
  • [#94812] nocache data is included in ROM section
  • [#94842] iar: Zephyr 4.2 fails with IAR EWARM 9.70.1
  • [#94954] Spurious error log "No valid legacy adv to resume" in bt_hci_le_enh_conn_complete when using bt_le_ext_adv_start()
  • [#95113] gpio_pin_get_config for STM32 returns wrong flags value for input pins
  • [#95146] i2c: stm32: non-RTIO driver fixes on PM and on STM32F7 from Zephyr v4.3
  • [#95297] Links to the pyOCD repository are outdated
  • [#95456] Zephyr Netstack buffer leaks
  • [#95580] Picolibc module and SDK are not in sync for Zephyr 4.2.0
  • [#95721] Boards documentation: "arm" Architecture not specified at least for STM32MP13 and STM32N6 boards
  • [#95724] drivers: i2c: stm32: build error when using DMAs with st,stm32-i2c-v2 driver
  • [#95768] Possible TCP connection leak when creating a socket
  • [#95850] Applications do not watch MCUboot key file for changes
  • [#96087] TCP connection sends an incorrect seqnum FIN message
  • [#96172] arch: arm: switch to privilege stack in SVC handler
  • [#96768] incorrect i2c3 base address on stm32f303Xe
Source: README.md, updated 2025-10-07