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CVE-2026-115653— Cortex-M module ports save a preempted user-mode module thread's registers through its unchecked stack pointer in privileged mode

Quick assessment

Affected
Eclipse Foundation Eclipse ThreadX
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Eclipse ThreadX 6.0.1 至 6.5.2.202603 版本中，Cortex-M 模块端口的 PendSV 异常处理程序会在特权模式下，将抢占的用户态模块线程的寄存器保存到从该线程栈指针（SP）获取的地址处，而未将该指针与该线程的栈边界进行校验。因此，一个具备内存保护的用户态模块能够向其可写入区域紧邻的下方内存中写入多达 9 个字（其中 8 个可由其任意选择）；若包含浮点状态，则最多可写入 25 个字，并随后读取该处存储的数据。

CVSS 7.0 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
Eclipse Foundation Eclipse ThreadX 6.0.1≤ 6.5.2.202603 affected
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I. Basic Information for CVE-2026-115653

Vulnerability Information
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Vulnerability Title
Cortex-M module ports save a preempted user-mode module thread's registers through its unchecked stack pointer in privileged mode
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Eclipse Foundation Eclipse ThreadX 6.0.1 ~ 6.5.2.202603 -

II. Public POCs for CVE-2026-115653

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III. Intelligence Information for CVE-2026-115653

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Other References for CVE-2026-115653 (2)

Same Patch Batch · Eclipse Foundation · 2026-11-02 · 4 CVEs total

CVE-2026-114408 8.7 HIGH NULL pointer dereference in ICMPv6 Packet Too Big processing when the destination table is
CVE-2026-115654 6.9 MEDIUM User-mode module can suspend, terminate, re-prioritise and abort the waits of threads it d
CVE-2026-118052 6.8 MEDIUM Module Manager loaders leave the manager mutex held when a module preamble's sizes overflo

IV. Related Vulnerabilities

Same product: Eclipse ThreadX
Same vendor: Eclipse Foundation
Same weakness: CWE-787