{"id":"CVE-2026-109588","revision":null,"records":[{"revision":"7a9bca13a4ef432fba4300a258525870","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-109588","aliases":[],"title":"Numeric truncation in the MPU buffer authorization check in FreeRTOS-Kernel","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.\n\n\n\nTo remediate this issue, users should upgrade to version V11.3.2 or later.","state":0,"publishedAt":"2026-10-16T17:09:51.788+00:00","modifiedAt":"2026-10-20T18:08:02.113+00:00","affected":[{"ecosystem":"Vendor product","name":"FreeRTOS-Kernel","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"FreeRTOS\",\n                    \"product\": \"FreeRTOS-Kernel\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"11.3.0\",\n                            \"lessThanOrEqual\": \"11.3.1\",\n                            \"versionType\": \"custom\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","score":8.8,"severity":"HIGH"},{"system":"CVSS 4.0","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","score":9.3,"severity":"CRITICAL"}],"references":["https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V11.3.2","https://aws.amazon.com/security/security-bulletins/2026-138-aws/","https://github.com/FreeRTOS/FreeRTOS-Kernel/security/advisories/GHSA-qf4j-6f5j-876g"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-109588","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-109588","identifiers":["CVE-2026-109588"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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