CVE-2026-109588 PUBLISHED

Numeric truncation in the MPU buffer authorization check in FreeRTOS-Kernel

Assigner: AMZN
Reserved: 12.10.2026 Published: 16.10.2026 Updated: 16.10.2026

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 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CVSS Score: 8.8

Attack Vector	Local	Scope	Changed
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	Low	Integrity Impact	High
User Interaction	None	Availability Impact	High

CVSS 3.1

CVSS Vector: 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
CVSS Score: 9.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Local	Confidentiality	High	Confidentiality	High
Attack Complexity	Low	Integrity	High	Integrity	High
Attack Requirements	None	Availability	High	Availability	High
Privileges Required	Low
User Interaction	None

CVSS 4.0

Product Status

Vendor	FreeRTOS
Product	FreeRTOS-Kernel
Versions	Default: unaffected affected from 11.3.0 to 11.3.1 (incl.)

Credits

Ada Logics Ltd finder
Anthropic finder

References

Problem Types

CWE-197 Numeric truncation error CWE
CWE-787 Out-of-bounds write CWE
CWE-125 Out-of-bounds read CWE

Impacts

CAPEC-100 Overflow Buffers