{"id":"CVE-2026-80995","title":"kernel: net: mctp: hold a reference to the route device in mctp_route_lookup() (CVE-2026-80995)","summary":"A flaw was found in the Linux kernel's MCTP (Message Control Transport Protocol) networking implementation. This vulnerability arises because the `mctp_route_lookup()` function accesses a route device without holding a persistent reference…","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-825","vendor":"Red Hat","product":"Red Hat OpenShift Container Platform 4","affected":["openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-14","sourceUpdated":"2026-09-14T20:16:15+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80995.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80995.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-80995"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532081"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80995"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80995"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80995.mbox"},{"url":"https://git.kernel.org/stable/c/408da1df18116c971c3392e21e50586688cd3fbf"},{"url":"https://git.kernel.org/stable/c/cc561f8af25586300c2f9d285babb163b866b293"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.0012,"epssPercentile":0.02113,"scores":{"vendor":4.7,"cna":7.8},"ingestedAt":"2026-09-14T15:23:07.476Z","slug":"CVE-2026-80995","body":"## Overview\n\nA flaw was found in the Linux kernel's MCTP (Message Control Transport Protocol) networking implementation. This vulnerability arises because the `mctp_route_lookup()` function accesses a route device without holding a persistent reference, allowing the device to be deallocated while still in use. A local, unprivileged user can exploit this condition on the receive/forwarding path, leading to a use-after-free. This can result in memory corruption or a denial of service (DoS).\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-2026-80995.json)\n\n**kernel: net: mctp: hold a reference to the route device in mctp_route_lookup()** — 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":204150,"id":"CVE-2026-80995","ts":1789490233122,"field":"cvss","old":"4.7","new":"5.5"},{"seq":202925,"id":"CVE-2026-80995","ts":1789403732974,"field":"cvss","old":"7.8","new":"4.7"},{"seq":202924,"id":"CVE-2026-80995","ts":1789403732974,"field":"severity","old":"high","new":"medium"},{"seq":183578,"id":"CVE-2026-80995","ts":1789356675960,"field":"cvss","old":"7.8","new":"4.7"},{"seq":183577,"id":"CVE-2026-80995","ts":1789356675960,"field":"severity","old":"high","new":"medium"},{"seq":153184,"id":"CVE-2026-80995","ts":1789285349451,"field":"cvss","old":null,"new":"7.8"},{"seq":153183,"id":"CVE-2026-80995","ts":1789285349451,"field":"severity","old":"none","new":"high"},{"seq":109574,"id":"CVE-2026-80995","ts":1789183732471,"field":"cvss","old":null,"new":"4.7"},{"seq":109573,"id":"CVE-2026-80995","ts":1789183732471,"field":"severity","old":"none","new":"medium"}]}