---
id: CVE-2026-115653
title: >-
  Cortex-M module ports save a preempted user-mode module thread's registers
  through its unchecked stack pointer in privileged mode
summary: >-
  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 …
severity: high
cvss: 7
cvssVector: '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'
cvssSource: cna
cwe:
  - CWE-787
  - CWE-822
vendor: Eclipse Foundation
product: Eclipse ThreadX
affected:
  - eclipse_threadx >= 6.0.1 <= 6.5.2.202603
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-02T16:17:16.642608Z'
published: '2026-11-02'
updated: '2026-11-02'
sourceUpdated: '2026-11-02T16:17:31.540Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-115653'
references:
  - url: >-
      https://github.com/eclipse-threadx/threadx/security/advisories/GHSA-c38r-v552-gh5g
  - url: 'https://gitlab.eclipse.org/security/cve-assignment/-/work_items/503'
tags:
  - cve.org
epss: 0.00145
epssPercentile: 0.03767
ingestedAt: '2026-11-05T19:30:42.707Z'
---

## Overview

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.

## Affected

- `eclipse_threadx >= 6.0.1 <= 6.5.2.202603`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.