{"id":"CVE-2026-109588","summary":"Numeric truncation in the MPU buffer authorization check in FreeRTOS-Kernel","details":"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.","aliases":["GHSA-qf4j-6f5j-876g"],"modified":"2026-10-24T02:48:40.372256378Z","published":"2026-10-16T17:09:51.788Z","database_specific":{"cna_assigner":"AMZN","cwe_ids":["CWE-125","CWE-197","CWE-787"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/109xxx/CVE-2026-109588.json","unresolved_ranges":[{"extracted_events":[{"range":[{"introduced":"11.3.0"},{"last_affected":"11.3.1"}],"source":"AFFECTED_FIELD","strategy":"StandardRange"}]},{"extracted_events":[{"range":[{"introduced":"11.3.0"},{"last_affected":"11.3.1"}],"source":"CPE_FIELD","strategy":"CPEApplicability"}]}]},"references":[{"type":"ADVISORY","url":"https://aws.amazon.com/security/security-bulletins/2026-138-aws/"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/109xxx/CVE-2026-109588.json"},{"type":"ADVISORY","url":"https://github.com/FreeRTOS/FreeRTOS-Kernel/security/advisories/GHSA-qf4j-6f5j-876g"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-109588"},{"type":"FIX","url":"https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V11.3.2"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/freertos/freertos-kernel","events":[{"introduced":"0"},{"fixed":"8a59a4b19bf72977819feddef87d41163ced7004"}],"database_specific":{"extracted_events":[{"range":[{"fixed":"8a59a4b19bf72977819feddef87d41163ced7004"}],"source":"REFERENCES_TAG","original_tag":"V11.3.2"}]}}],"versions":["V10.4.3","V10.4.2","V10.4.1-kernel-only","V10.4.0-kernel-only","V10.3.1-kernel-only","V10.3.0-kernel-only"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-109588.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}