{"id":"CVE-2026-109588","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-109588","generatedAt":"2026-10-28T01:02:37.255Z","title":"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…","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.","published":"2026-10-16T18:17:31.000Z","lastModified":"2026-10-20T19:17:29.000Z","status":"Awaiting Analysis","sourceIdentifier":"ff89ba41-3aa1-4d27-914a-91399e9639e5","cvss":{"version":"4.0","score":9.3,"severity":"CRITICAL","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-125","CWE-197","CWE-787"],"affected":[],"epss":{"score":0.00157,"percentile":0.04843,"date":"2026-10-26","history":[{"date":"2026-10-17","score":0.00121,"percentile":0.01769}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.16%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-16T18:17:31.000Z","detail":{"score":"9.3","severity":"CRITICAL","publishedAt":"2026-10-16T18:17:31.457Z"},"summary":"New CVE, critical severity (CVSS 9.3)."}],"references":[{"url":"https://aws.amazon.com/security/security-bulletins/2026-138-aws/","source":"ff89ba41-3aa1-4d27-914a-91399e9639e5"},{"url":"https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V11.3.2","source":"ff89ba41-3aa1-4d27-914a-91399e9639e5"},{"url":"https://github.com/FreeRTOS/FreeRTOS-Kernel/security/advisories/GHSA-qf4j-6f5j-876g","source":"ff89ba41-3aa1-4d27-914a-91399e9639e5"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-109588","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}