{"id":"CVE-2026-80975","title":"kernel: mfd: qnap-mcu: keep the reply buffer alive past a command timeout (CVE-2026-80975)","summary":"A flaw was found in the Linux kernel's `qnap-mcu` driver. This vulnerability occurs when the driver processes commands and a reply from the Microcontroller Unit (MCU) arrives after a command has timed out or failed. The driver may write th…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":"CWE-562","vendor":"Red Hat","product":"Red Hat OpenShift Container Platform 4","affected":["openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-14","sourceUpdated":"2026-09-14T18:37:43+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80975.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80975.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-80975"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532227"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80975"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80975"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80975.mbox"},{"url":"https://git.kernel.org/stable/c/0b6680e306397097a97767447368221fac753809"},{"url":"https://git.kernel.org/stable/c/47504742cea7878ebd1bf1491bbed923df6b90b1"},{"url":"https://git.kernel.org/stable/c/8391ee06d08845a0a165b5fe679ba326915166b2"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00161,"epssPercentile":0.05763,"scores":{"vendor":5.7,"cna":7.8},"ingestedAt":"2026-09-14T15:23:07.476Z","slug":"CVE-2026-80975","body":"## Overview\n\nA flaw was found in the Linux kernel's `qnap-mcu` driver. This vulnerability occurs when the driver processes commands and a reply from the Microcontroller Unit (MCU) arrives after a command has timed out or failed. The driver may write this late or unsolicited message into a memory area that is no longer in use, leading to memory corruption. This can result in system instability or a denial of service.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80975.json)\n\n**kernel: mfd: qnap-mcu: keep the reply buffer alive past a command timeout** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-14.\n\nNot affected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nRefer to the advisory for fix availability.","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":204192,"id":"CVE-2026-80975","ts":1789490239019,"field":"cvss","old":"5.7","new":"5.5"},{"seq":202939,"id":"CVE-2026-80975","ts":1789403733032,"field":"cvss","old":"7.8","new":"5.7"},{"seq":202938,"id":"CVE-2026-80975","ts":1789403733032,"field":"severity","old":"high","new":"medium"},{"seq":183606,"id":"CVE-2026-80975","ts":1789356676077,"field":"cvss","old":"7.8","new":"5.7"},{"seq":183605,"id":"CVE-2026-80975","ts":1789356676077,"field":"severity","old":"high","new":"medium"},{"seq":153154,"id":"CVE-2026-80975","ts":1789285349323,"field":"cvss","old":null,"new":"7.8"},{"seq":153153,"id":"CVE-2026-80975","ts":1789285349323,"field":"severity","old":"none","new":"high"},{"seq":147516,"id":"CVE-2026-80975","ts":1789270211214,"field":"cvss","old":null,"new":"5.7"},{"seq":147515,"id":"CVE-2026-80975","ts":1789270211214,"field":"severity","old":"none","new":"medium"},{"seq":109272,"id":"CVE-2026-80975","ts":1789183731228,"field":"cvss","old":null,"new":"5.7"},{"seq":109271,"id":"CVE-2026-80975","ts":1789183731228,"field":"severity","old":"none","new":"medium"}]}