FreeRTOS-Kernel Incorrect Authorization Flaw (CVE-2026-109587) Rated CVSS 8.8
A newly published high vulnerability in FreeRTOS-Kernel carries a CVSS score of 8.8. Here is what is affected and how to respond.
Key points
- CVE-2026-109587 affects FreeRTOS-Kernel.
- CVSS 8.8 (High).
- No exploitation confirmed yet.
A high incorrect authorization tracked as CVE-2026-109587 has been published in the National Vulnerability Database for FreeRTOS-Kernel, with a CVSS base score of 8.8.
At a glance
- CVE
- CVE-2026-109587
- Product
- FreeRTOS-Kernel
- CVSS
- 8.8 High
- Weakness
- incorrect authorization
- Exploited
- No known exploitation
What is the vulnerability?
The NVD entry states: Incorrect authorization in the Arm Cortex-R82 (Armv8-R AArch64) MPU port in FreeRTOS-Kernel V11.3.0 and V11.3.1 might allow an unprivileged task on MPU-enabled builds to read and write privileged kernel memory outside the regions assigned to it, via a buffer argument passed to an MPU system call.
To remediate this issue, users should upgrade to version V11.3.2 or later.
Affected versions
| Vendor | Product | Versions |
|---|---|---|
| Freertos | FreeRTOS-Kernel | up to 11.3.1 |
CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
Is it being exploited?
There is no public confirmation of exploitation at the time of publication. It does not appear in CISA's Known Exploited Vulnerabilities catalog. We will update this report if that changes.
What should you do?
- Identify whether the affected product and versions run in your environment.
- Apply the vendor update listed in the advisory as soon as it is available.
- Limit network exposure of the affected service until it is patched.
- Monitor the vendor advisory for updated guidance or exploitation reports.
What to do and how to stay safe: CVE-2026-109587
- Vulnerability severity scores ignore your specific architecture and context.
- Exploitability depends on network exposure and user behavior, not just code flaws.
- Prioritization requires continuous asset inventory and threat intelligence alignment.
Risk-based vulnerability management focuses your limited resources on the flaws that actually threaten your business. Start by mapping your critical assets and checking for active exploits to prioritize your backlog.
Step-by-step guide: Risk-Based Vulnerability Management: Prioritize Fixes by Actual Danger
General security guidance from the Threat Times newsroom. It is not confirmed advice from the organisations named in this story.
Frequently asked questions
What is CVE-2026-109587?
CVE-2026-109587 is a incorrect authorization vulnerability in FreeRTOS-Kernel.
How severe is CVE-2026-109587?
It has a CVSS score of 8.8 High.
Is CVE-2026-109587 being exploited?
There is no public confirmation of exploitation at the time of publication.
