Description
Missing privilege verification in the secure context cleanup handler in FreeRTOS-Kernel before 11.3.1 might allow local users to cause a use-after-free condition in secure-world memory via the SVC handler for secure context deallocation. To remediate this issue, users should upgrade to version 11.3.1 or later.
Published: 2026-08-21
Score: 8.3 High
EPSS: < 1% Very Low
KEV: No
Impact: Use‑After‑Free in Secure Context Deletion
Action: Immediate Patch
AI Analysis

Impact

The kernel’s SecureContext_FreeContext routine lacks a privilege check, allowing a local user to trigger a use‑after‑free condition during secure‑world memory cleanup via the SVC handler. This flaw can lead to arbitrary code execution or a denial of service within the secure partition, compromising confidentiality, integrity, or availability of protected data.

Affected Systems

FreeRTOS applications built with FreeRTOS‑Kernel versions prior to 11.3.1, including all derivatives that integrate the kernel directly.

Risk and Exploitability

The CVSS score of 8.3 indicates a high severity, and the fault is exploitable by users who can invoke the SVC handler for context deallocation. No public exploitation reports exist and the vulnerability is not listed in the CISA KEV catalog, but the EPSS score is unavailable, so the exploitation probability is unknown. Nonetheless, the local nature of the attack vector means that any device running an affected kernel constitutes a direct risk.

Generated by OpenCVE AI on August 21, 2026 at 19:43 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Upgrade the FreeRTOS‑Kernel to version 11.3.1 or later, which adds the missing privilege check.
  • Revoke or restrict user privileges that allow triggering secure context deallocation via the SVC handler to prevent unauthorized use.
  • Employ memory sanitizers or static analysis tools to detect potential use‑after‑free patterns in the kernel code during development.

Generated by OpenCVE AI on August 21, 2026 at 19:43 UTC.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

History

Thu, 27 Aug 2026 18:00:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 25 Aug 2026 17:00:00 +0000

Type Values Removed Values Added
First Time appeared Amazon
Amazon freertos
CPEs cpe:2.3:o:amazon:freertos:*:*:*:*:*:*:*:*
Vendors & Products Amazon
Amazon freertos

Fri, 21 Aug 2026 20:00:00 +0000


Fri, 21 Aug 2026 18:15:00 +0000

Type Values Removed Values Added
Description Missing privilege verification in the secure context cleanup handler in FreeRTOS-Kernel before 11.3.1 might allow local users to cause a use-after-free condition in secure-world memory via the SVC handler for secure context deallocation.  To remediate this issue, users should upgrade to version 11.3.1 or later. Missing privilege verification in the secure context cleanup handler in FreeRTOS-Kernel before 11.3.1 might allow local users to cause a use-after-free condition in secure-world memory via the SVC handler for secure context deallocation. To remediate this issue, users should upgrade to version 11.3.1 or later.

Fri, 21 Aug 2026 18:00:00 +0000

Type Values Removed Values Added
Description Missing privilege verification in the secure context cleanup handler in FreeRTOS-Kernel before 11.3.1 might allow local users to cause a use-after-free condition in secure-world memory via the SVC handler for secure context deallocation.  To remediate this issue, users should upgrade to version 11.3.1 or later.
Title Missing privilege check in SecureContext_FreeContext in FreeRTOS-Kernel
First Time appeared Freertos
Freertos freertos-kernel
Weaknesses CWE-416
CPEs cpe:2.3:a:freertos:freertos-kernel:*:*:*:*:*:*:*:*
Vendors & Products Freertos
Freertos freertos-kernel
References
Metrics cvssV3_1

{'score': 7.3, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H'}

cvssV4_0

{'score': 8.3, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:H/SA:H'}


Subscriptions

Amazon Freertos
Freertos Freertos-kernel
cve-icon MITRE

Status: PUBLISHED

Assigner: AMZN

Published:

Updated: 2026-08-27T16:46:35.660Z

Reserved: 2026-08-20T18:42:39.750Z

Link: CVE-2026-77235

cve-icon Vulnrichment

Updated: 2026-08-27T16:08:14.777Z

cve-icon NVD

Status : Analyzed

Published: 2026-08-21T18:16:51.657

Modified: 2026-08-27T20:18:39.277

Link: CVE-2026-77235

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-21T21:15:21Z

Weaknesses