{"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","slug":"CVE-2026-115653","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `eclipse_threadx >= 6.0.1 <= 6.5.2.202603`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}