Vulnerability details
CVE-2026-109588
FreeRTOS FreeRTOS-Kernel
Numeric truncation in the MPU buffer authorization check in FreeRTOS-Kernel
CVSS 4.0
9.3Critical
Official description
Numeric truncation of the buffer length in the MPU buffer authorization check in FreeRTOS-Kernel V11.3.0 and V11.3.1 on the Arm Cortex-R82 (Armv8-R AArch64) MPU port might allow, under certain conditions, an unprivileged task on MPU-enabled builds to read or write privileged kernel memory beyond the validated buffer window, via a stream buffer system call. To remediate this issue, users should upgrade to version V11.3.2 or later.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.3Critical | 4.0 | CVEProject cvelistV5 (CNA) (AMZN) | CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H |
| 8.8High | 3.1 | CVEProject cvelistV5 (CNA) (AMZN) | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| FreeRTOS | FreeRTOS-Kernel | 11.3.0 ≤ v ≤ 11.3.1 | CVEProject cvelistV5 (CNA) |
References and advisories
3- https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V11.3.2 release-notespatch
- https://aws.amazon.com/security/security-bulletins/2026-138-aws/ vendor-advisory
- https://github.com/FreeRTOS/FreeRTOS-Kernel/security/advisories/GHSA-qf4j-6f5j-876g third-party-advisory
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Details
- Published
- 2026-10-16
- Last updated
- 2026-10-20
- State
- Published
- Assigner (CNA)
- AMZN
- Kolun priority
- 15 · Low
Exploit prediction (EPSS)
0.15%
Probability of exploitation in 30 days
4.9%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-197Numeric truncation error
- CWE-787Out-of-bounds write
- CWE-125Out-of-bounds read