Add V11.3.1 changelog entry (#1478)
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Documentation and download available at https://www.FreeRTOS.org/
+Changes between FreeRTOS V11.3.0 and FreeRTOS V11.3.1 released August 2026
+
+ + Add Symmetric Multiprocessing (SMP) support to the Armv8-M ports for the
+ GCC, ArmClang and IAR toolchains. This adds per core critical nesting
+ state, spinlocks, inter-core yield and wakeup using SEV/WFE, primary and
+ secondary core bring up synchronization, and a core safe PendSV context
+ switch. Single core builds are unchanged. We thank @AhmedIsmail02 for
+ their contribution.
+ + Add new xTaskPeriodicDelay API for periodic tasks. It supersedes
+ xTaskDelayUntil by preventing run away of pxPreviousWakeTime, catching up
+ skipped periods immediately while returning the number of periods skipped,
+ and returning 0 when not enough ticks have elapsed. We thank @ntd for
+ their contribution.
+ + Add uxTaskCallForEachTask API, which invokes a caller supplied callback
+ for each task in the system, and refactor uxTaskGetSystemState to use it.
+ We thank @DRNadler for their contribution.
+ + Add configIDLE_AFFINITY configuration option, which pins each Idle task to
+ its corresponding core in SMP systems. It defaults to 0, which allows the
+ scheduler to run Idle tasks on any available core. We thank @rus084 for
+ their contribution.
+ + Add validation to SecureContext_AllocateContext in the ARMv8-M secure side
+ ports to ensure that the requested secure stack size plus the stack seal
+ size does not overflow before allocating. We thank Jordan Mecom (Block,
+ Inc.) for reporting this issue.
+ + Add assertions to vQueueDelete to check that no tasks are blocked on the
+ queue being deleted.
+ + Add a link to the FreeRTOS Kernel threat model in SECURITY.md.
+ + Add documentation clarifying that the MemoryRegion_t ulParameters macros
+ are port specific, so applications must use the tskMPU_REGION_* or
+ portMPU_REGION_* values that match their MPU port. We thank @Old-Ding for
+ their contribution.
+ + Add a comment documenting that a privileged task must revoke access
+ permissions before deleting a kernel object when using Access Control
+ Lists.
+ + Update the ARM_CRx_No_GIC port to declare vPortYield as a weak symbol so
+ that devices with a dedicated software interrupt register can substitute
+ their own yield trigger. The default behavior is unchanged. We thank
+ @maximdeclercq for their contribution.
+ + Update the FreeRTOSConfig.h template to use a 32-bit tick type, which
+ avoids compiler warnings on Windows where a 64-bit tick resolves to
+ unsigned long long.
+ + Update the deprecated CMake configuration warning to use INTERFACE rather
+ than PUBLIC for the freertos_config interface library. We thank @Isla-jq
+ for their contribution.
+ + Fix vPortFreeSecureContext in the ARMv8-M ports to read xSecureContext at
+ the correct offset. When the MPU is enabled, the first item in the TCB is
+ the stored context location rather than the top of stack, so
+ xSecureContext is located at a negative offset from that position.
+ + Fix SecureContext_AllocateContext in the ARMv8-M secure side ports to
+ reject a secure stack size smaller than the stack seal size.
+ + Fix SecureContext_FreeContext in the ARMv8-M secure side ports to refuse
+ to free the secure context that is currently loaded, as indicated by
+ PSPLIM. Freeing it left the running task referencing freed secure memory.
+ The task handle supplied by the non-secure side is untrusted, so it is
+ now used only as an additional ownership check.
+ + Fix the ARMv8-M ports to service the portSVC_START_SCHEDULER and
+ portSVC_FREE_SECURE_CONTEXT supervisor calls only when they are raised
+ from privileged code. When the MPU is enabled, both requests are now
+ ignored unless the calling program counter lies within the privileged
+ functions section.
+ + Fix a type confusion in xQueueAddToSet by verifying that the object
+ passed as the queue set really is a queue set, that is, that its item
+ size is sizeof( Queue_t * ). Passing an ordinary queue now returns
+ pdFAIL rather than allowing prvNotifyQueueSetContainer to copy item size
+ bytes from a single pointer on the stack.
+ + Fix xTimerGenericCommandFromTask to validate the lower bound of
+ xCommandID in addition to the existing upper bound, so that only the
+ valid task command range from tmrCOMMAND_START_DONT_TRACE to
+ tmrCOMMAND_DELETE is accepted. Rejected commands return pdFAIL, and
+ behavior for valid commands and for xTimerGenericCommandFromISR is
+ unchanged.
+ + Fix a kernel object pool entry leak by adding an MPU wrapper for the
+ xTimerDelete API, so that the pool index is freed when a timer is deleted
+ with MPU wrappers version 2.
+ + Fix the MPU wrapper macro mapping for the ARMv8-M ports.
+ + Fix silently failing critical sections in unprivileged tasks by
+ disallowing configALLOW_UNPRIVILEGED_CRITICAL_SECTIONS with MPU wrappers
+ version 2 in the ARMv7-M MPU ports. The option now defaults to 0 under
+ version 2, and explicitly setting it to 1 raises a compile time error.
+ Behavior with MPU wrappers version 1 is unchanged.
+ + Fix a time of check to time of use race condition in vTaskListTasks, where
+ reading the volatile task count twice allowed a task to be created between
+ the reads, resulting in an undersized allocation and a possible buffer
+ overflow in uxTaskGetSystemState. We thank @srpatcha for their
+ contribution.
+ + Fix a spurious heap_5 assertion when configENABLE_HEAP_PROTECTOR is 1 and
+ an allocation cannot be satisfied. The free block search reaching the end
+ marker is a normal out of memory condition, so pvPortMalloc now returns
+ NULL and invokes the malloc failed hook instead of asserting.
+ + Fix batching stream buffers to unblock a receiver only after the buffered
+ byte count exceeds, rather than reaches, the trigger level. Previously a
+ receiver could be woken early and xStreamBufferReceive could return 0
+ bytes. Stream buffer and message buffer semantics are unchanged. We thank
+ @officialasishkumar for their contribution.
+ + Fix MISRA C 2012 Rule 20.4 violation by replacing `#define static` with a
+ STATIC macro, which also keeps the static variables in
+ vApplicationGetIdleTaskMemory and vApplicationGetPassiveIdleTaskMemory
+ static when portREMOVE_STATIC_QUALIFIER is defined. We thank @elsonwei for
+ their contribution.
+ + Fix undefined behavior in the MSVC-MingW port caused by left shifting a
+ signed int by 31 or more bits.
+ + Fix a duplicate Doxygen \defgroup identifier by giving
+ uxTaskBasePriorityGet its own group instead of reusing the
+ uxTaskPriorityGet group.
+ + Fix the incorrect #endif comment after vPortSetupTimerInterrupt in the GCC
+ and IAR RISC-V ports, which duplicated configMTIME_BASE_ADDRESS and
+ omitted configMTIMECMP_BASE_ADDRESS. We thank @cuiweixie for their
+ contribution.
+ + Fix incorrect #endif comments in croutine.c and queue.c, which reversed
+ the configUSE_CO_ROUTINES condition and named the wrong configuration
+ option for configSUPPORT_DYNAMIC_ALLOCATION. We thank @Zepp-Hanzj for
+ their contribution.
+ + Fix the configLIST_VOLATILE #endif comment and the documented parameter
+ names for uxListRemove in include/list.h. We thank @rakeshr-source for
+ their contribution.
+ + Fix the type and timeout values used in the xStreamBufferSend and
+ xMessageBufferSend documentation examples. We thank @Isla-jq for their
+ contribution.
+ + Fix copy and paste comment typos in xTaskGetApplicationTaskTag and
+ xTaskGetApplicationTaskTagFromISR, and a typo in the
+ xTaskGenericNotifyWait comment. We thank @wanghengZzz for their
+ contributions.
+ + Fix comment typos in the queue.h, list.h and task.h documentation,
+ including the xQueueReceiveFromISR and xQueueGenericSend examples, the
+ listGET_ITEM_VALUE_OF_HEAD_ENTRY \page tag, and the uxIndexToCLear typo.
+ We thank @zepp-chen for their contribution.
+ + Fix the FreeRTOSConfig.h template path referenced in README.md. We thank
+ @IClementI for their contribution.
+ + Fix the missing V prefix in the release_tag and namespace-prefix inputs of
+ the auto release workflow.
+ + Fix long path failures in the Windows kernel demo builds by enabling
+ Windows long path support in CI.
+ + Remove an unnecessary const variable from the GCC and IAR RISC-V ports. We
+ thank @IClementI for their contribution.
+
Changes between FreeRTOS V11.2.0 and FreeRTOS V11.3.0 released March 2026
+ Correct minor mistakes in code comments in event_groups.c, include/queue.h,
