{"id":"CVE-2026-89684","title":"kernel: nfsd: fix cpntf publish race in nfs4_init_cp_state (CVE-2026-89684)","summary":"A flaw was found in the Linux kernel's nfsd component. A remote attacker, by sending a specially crafted OFFLOAD_CANCEL request, could exploit a race condition during the initialization of copy state notifications. This could lead to a den…","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-824","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 6","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-21","sourceUpdated":"2026-09-21T11:06:12+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89684.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89684.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89684"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532088"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89684"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89684"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89684.mbox"},{"url":"https://git.kernel.org/stable/c/63e18fc65587fd3f7b4c6d70e96d32fc41d82ba3"},{"url":"https://git.kernel.org/stable/c/6ac469a274e3c7d87fc46ba46d83b95009680407"},{"url":"https://git.kernel.org/stable/c/8eeca993357a0bc35aaefebfd7462ac7b0a21d9a"},{"url":"https://git.kernel.org/stable/c/bfeac42d9074e539bacd1898dd8c14b7f5776620"},{"url":"https://git.kernel.org/stable/c/21d6c5957f5ca97d7352e60f55ea412beb9419f5"},{"url":"https://git.kernel.org/stable/c/a631a26a8777bb235eabd478bbbaf26a4db750bf"},{"url":"https://git.kernel.org/stable/c/c7270f62e7a05a2ee68aa2b74262b658a14463bd"},{"url":"https://git.kernel.org/stable/c/be3a5c1d857b0dcbc11796cea603ef25834f75b2"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00508,"epssPercentile":0.42223,"scores":{"vendor":7,"cna":7.5},"ingestedAt":"2026-09-14T15:23:07.450Z","slug":"CVE-2026-89684","body":"## Overview\n\nA flaw was found in the Linux kernel's nfsd component. A remote attacker, by sending a specially crafted OFFLOAD_CANCEL request, could exploit a race condition during the initialization of copy state notifications. This could lead to a denial of service (DoS) by causing the server to crash.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89684.json)\n\n**kernel: nfsd: fix cpntf publish race in nfs4_init_cp_state** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-21.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\nNot affected:\n\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nOut of support scope","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":208475,"id":"CVE-2026-89684","ts":1790005711529,"field":"cvss","old":"7.5","new":"7"},{"seq":183359,"id":"CVE-2026-89684","ts":1789356675036,"field":"cvss","old":"7.5","new":"5.3"},{"seq":183358,"id":"CVE-2026-89684","ts":1789356675036,"field":"severity","old":"high","new":"medium"},{"seq":153558,"id":"CVE-2026-89684","ts":1789285351277,"field":"cvss","old":null,"new":"7.5"},{"seq":153557,"id":"CVE-2026-89684","ts":1789285351277,"field":"severity","old":"none","new":"high"},{"seq":147692,"id":"CVE-2026-89684","ts":1789270211904,"field":"cvss","old":null,"new":"5.3"},{"seq":147691,"id":"CVE-2026-89684","ts":1789270211904,"field":"severity","old":"none","new":"medium"},{"seq":109444,"id":"CVE-2026-89684","ts":1789183731938,"field":"cvss","old":null,"new":"5.3"},{"seq":109443,"id":"CVE-2026-89684","ts":1789183731938,"field":"severity","old":"none","new":"medium"}]}