CVE-2026-115653
Cortex-M module ports save a preempted user-mode module thread's registers through its unchecked stack pointer in privileged mode
In Eclipse ThreadX versions 6.0.1 through 6.5.2.202603, the PendSV handler of the Cortex-M module ports saves a preempted user-mode module thread's registers in privileged mode at addresses taken from the thread's stack pointer, without checking that pointer against the thread's stack. A user-mode, memory-protected module can thereby write up to nine words, eight of its choosing, or 25 with floating-point state, into memory immediately below any region it may write, and read back what is stored there.
Fixes and workarounds
Fix
ThreadX (eclipse threadx): GitHub reports patched versions 6.5.2.202603b. Check the advisory for the affected release branch.
Source: GitHub GHSA-c38r-v552-gh5gAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| Eclipse ThreadX Eclipse Foundation |
≥ 6.0.1; ≤ 6.5.2.202603 (affected, custom)
Other versions: unaffected |
CNA: eclipse |
ThreadXThreadX
eclipse threadx |
>= 6.0.1, <= 6.5.2.202603 (affected, GitHub advisory range) | GitHub GHSA-c38r-v552-gh5g |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 7.0 high |
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N | CNA: eclipse |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/eclipse-threadx/threadx/security/advisories/GHSA-c38r-v552-gh5gCNA: eclipse
- https://gitlab.eclipse.org/security/cve-assignment/-/work_items/503CNA: eclipse
- https://github.com/eclipse-threadx/threadx/security/advisories/GHSA-c38r-v552-gh5gGitHub Security Advisories · advisory
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