{"id":"CVE-2026-89477","title":"kernel: sctp: fix NULL deref on untransmitted RECONF completion (CVE-2026-89477)","summary":"A flaw was found in the Stream Control Transmission Protocol (SCTP) implementation within the Linux kernel. This vulnerability occurs when the kernel attempts to complete a stream reconfiguration request that has not been fully transmitted…","severity":"high","cvss":7,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"vendor","cwe":"CWE-476","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 8","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-18","sourceUpdated":"2026-09-18T08:40:21+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89477.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89477.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89477"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532238"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89477"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89477"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89477.mbox"},{"url":"https://git.kernel.org/stable/c/79ff751311e80fa0370007e46a79a6d601685e75"},{"url":"https://git.kernel.org/stable/c/53141db979687eae7dc6d29414cefc77034f967e"},{"url":"https://git.kernel.org/stable/c/68891125af5a5dfbca728809a16637a869bbe0df"},{"url":"https://git.kernel.org/stable/c/b2d6d873b4dfb5b84194061c4b40a1cd85b92ca4"},{"url":"https://git.kernel.org/stable/c/77ea60f2d24002c308f224db44a4542c466489af"},{"url":"https://git.kernel.org/stable/c/25419f516ea84b1e7d3d55aae5215ac86ece0c66"},{"url":"https://git.kernel.org/stable/c/0ee697defc0594f1da810ed75d9d643fb46f5318"},{"url":"https://git.kernel.org/stable/c/2db9bfa3e27bdea15e05ea70b56bad3d21e570ec"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00508,"epssPercentile":0.42222,"scores":{"vendor":7,"cna":7.5},"ingestedAt":"2026-09-14T15:23:07.453Z","slug":"CVE-2026-89477","body":"## Overview\n\nA flaw was found in the Stream Control Transmission Protocol (SCTP) implementation within the Linux kernel. This vulnerability occurs when the kernel attempts to complete a stream reconfiguration request that has not been fully transmitted, leading to a null pointer dereference. An unprivileged local user or a remote attacker could exploit this by triggering specific stream reset or reconfiguration requests, causing the kernel to panic and resulting in a denial of service.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89477.json)\n\n**kernel: sctp: fix NULL deref on untransmitted RECONF completion** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-18.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\nNot affected:\n\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 7\n\n## Remediation\n\nAffected","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":206967,"id":"CVE-2026-89477","ts":1789749722886,"field":"cvss","old":"7.5","new":"7"},{"seq":198028,"id":"CVE-2026-89477","ts":1789384321456,"field":"cvss","old":"5.9","new":"7.5"},{"seq":198027,"id":"CVE-2026-89477","ts":1789384321456,"field":"severity","old":"medium","new":"high"},{"seq":183799,"id":"CVE-2026-89477","ts":1789356677442,"field":"cvss","old":"7.5","new":"5.9"},{"seq":183798,"id":"CVE-2026-89477","ts":1789356677442,"field":"severity","old":"high","new":"medium"},{"seq":153254,"id":"CVE-2026-89477","ts":1789285349755,"field":"cvss","old":null,"new":"7.5"},{"seq":153253,"id":"CVE-2026-89477","ts":1789285349755,"field":"severity","old":"none","new":"high"},{"seq":147580,"id":"CVE-2026-89477","ts":1789270211467,"field":"cvss","old":null,"new":"5.9"},{"seq":147579,"id":"CVE-2026-89477","ts":1789270211467,"field":"severity","old":"none","new":"medium"},{"seq":109330,"id":"CVE-2026-89477","ts":1789183731451,"field":"cvss","old":null,"new":"5.9"},{"seq":109329,"id":"CVE-2026-89477","ts":1789183731451,"field":"severity","old":"none","new":"medium"}]}