{"id":"CVE-2026-98812","title":"kernel: net/mctp: publish the mctp_dev only after it is initialised (CVE-2026-98812)","summary":"A flaw was found in the Linux kernel's Management Component Transport Protocol (MCTP) subsystem. This vulnerability allows a local user to cause a Denial of Service (DoS) by triggering a kernel crash. During device setup, the kernel expose…","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-476","vendor":"Red Hat","product":"Linux","affected":["Linux >= 583be982d93479ea3d85091b0fd0b01201ede87d < 288ef37e0c463192dbb6436e61cdc07ce666dcb9","Linux >= 583be982d93479ea3d85091b0fd0b01201ede87d < af6e4f931afc2d670d133aa2bedc8b6e3753c618","Linux >= 583be982d93479ea3d85091b0fd0b01201ede87d < 63120572edde85bb2b70b0ed4d4817ed52247613","Linux >= 583be982d93479ea3d85091b0fd0b01201ede87d < f37f42e6e039a48c2dcf6c079b9f7fbc864ab7ef","Linux >= 583be982d93479ea3d85091b0fd0b01201ede87d < aadf655e8ea9a8ffa24bb8d69f504572e8d18181","Linux 5.15"],"published":"2026-10-18","updated":"2026-10-23","sourceUpdated":"2026-10-23T19:20:38+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98812.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98812.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98812"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2555202"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98812"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98812"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98812.mbox"},{"url":"https://git.kernel.org/stable/c/288ef37e0c463192dbb6436e61cdc07ce666dcb9"},{"url":"https://git.kernel.org/stable/c/af6e4f931afc2d670d133aa2bedc8b6e3753c618"},{"url":"https://git.kernel.org/stable/c/63120572edde85bb2b70b0ed4d4817ed52247613"},{"url":"https://git.kernel.org/stable/c/f37f42e6e039a48c2dcf6c079b9f7fbc864ab7ef"},{"url":"https://git.kernel.org/stable/c/aadf655e8ea9a8ffa24bb8d69f504572e8d18181"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00175,"epssPercentile":0.06974,"ingestedAt":"2026-10-18T16:47:32.478Z","slug":"CVE-2026-98812","body":"## Overview\n\nA flaw was found in the Linux kernel's Management Component Transport Protocol (MCTP) subsystem. This vulnerability allows a local user to cause a Denial of Service (DoS) by triggering a kernel crash. During device setup, the kernel exposes the network device object before its internal pointers are fully initialized. A concurrent operation accessing the uninitialized device dereferences a null pointer, crashing the system.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · updated 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98812.json)\n\n**kernel: net/mctp: publish the mctp_dev only after it is initialised** — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-23.\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":228664,"id":"CVE-2026-98812","ts":1792844864617,"field":"cvss","old":null,"new":"5.5"},{"seq":228663,"id":"CVE-2026-98812","ts":1792844864617,"field":"severity","old":"none","new":"medium"}]}