{"schema":"threatline.record/2","record":{"id":"CVE-2026-109588","aliases":["GHSA-qf4j-6f5j-876g"],"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.","categories":["Unclassified"],"product":"FreeRTOS-Kernel","vendor":"FreeRTOS","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-109588","source_modified_at":"2026-10-20T18:08:02.113Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"FreeRTOS-Kernel","vendor":"FreeRTOS","versions":[{"status":"affected","version":"11.3.0","lessThanOrEqual":"11.3.1","versionType":"custom"}],"defaultStatus":"unaffected"}],"fixed_versions":[],"cvss":8.8,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00121,"percentile":0.01802,"score_date":"2026-10-23"},"published_at":"2026-10-16T17:09:51.788Z","modified_at":"2026-10-20T18:08:02.113Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-109588","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-20T18:08:02.113Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-109588","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V11.3.2","tags":["release-notes","patch"]},{"source":"CVE List","url":"https://aws.amazon.com/security/security-bulletins/2026-138-aws/","tags":["vendor-advisory"]},{"source":"CVE List","url":"https://github.com/FreeRTOS/FreeRTOS-Kernel/security/advisories/GHSA-qf4j-6f5j-876g","tags":["third-party-advisory"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"no","technical_impact":"total","assessed_at":"2026-10-20T17:30:55.749548Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-20T18:08:02.113Z","content_hash":"5ca23b7f5ee2798d32d88540e87659853dfeb124b8f56053c1205c6de27262f6"}}