CVE-2026-95108 Deleting a user-mode module thread leaks its privileged kernel stack
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-95108?
CVE-2026-95108 is a medium-severity vulnerability in Eclipse ThreadX, published on 20 Oct 2026.
Official description
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`.
Which versions are affected by CVE-2026-95108?
How do I fix CVE-2026-95108?
No fix has been published for CVE-2026-95108 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-95108 being exploited?
There is no known exploitation of CVE-2026-95108 in the wild and no public exploit code.
Sources
Also known as GHSA-9hhf-6357-hpgq.