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CVE-2026-95108
One logical thread of a user-mode ThreadX module costs the Module Manager's shared object pool two allocations, not one. The module asks for a TX_THREAD control block through txm_module_object_allocate; _txm_module_manager_thread_create then takes a second allocation of TXM_MODULE_KERNEL_STACK_SIZE bytes for the privileged kernel stack that thread's system calls run on, and records it in the control block. Both come from _txm_module_manager_object_pool and both are linked onto the module's allocation list.
The Module Manager's thread-delete dispatcher released only the first. The kernel stack stayed allocated until the whole module was stopped, so a module that creates, terminates and deletes threads in a loop — every state transition valid, every service returning TX_SUCCESS — removed a fixed block from a finite pool shared by the manager and by every other loaded module, on every cycle, for as long as it stayed loaded. Once the pool is exhausted, no memory-protected module can create any kernel object and no user-mode module thread can be created anywhere in the system.
Vulnerable function: _txm_module_manager_tx_thread_delete_dispatch, in common_modules/module_manager/inc/txm_module_manager_dispatch.h.
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The vulnerability requires local access to the device to be exploited. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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