{"id":"CVE-2026-89702","title":"kernel: nfsd: size fh_verify server sockaddr slot by xpt_locallen (CVE-2026-89702)","summary":"A flaw was found in the Linux kernel's Network File System Daemon (nfsd). When processing NFSv2/v3-over-UDP requests, the `nfsd_fh_verify` and `nfsd_fh_verify_err` tracepoints incorrectly size a memory buffer. This can lead to an out-of-bo…","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-787","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":"2026-09-15","sourceUpdated":"2026-09-15T15:02:31+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89702.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89702.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89702"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532472"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89702"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89702"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89702.mbox"},{"url":"https://git.kernel.org/stable/c/719a10e3f5f868c3c4ac3cf3648c5775d12034bd"},{"url":"https://git.kernel.org/stable/c/71d068490098b1d23c63b2345e40675d3a1ca763"},{"url":"https://git.kernel.org/stable/c/7ff8d6363cffff45654ea85e319f7c0c54226012"},{"url":"https://git.kernel.org/stable/c/95d064f9828a20ccca5ae90a17be3e2076f25272"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00463,"epssPercentile":0.39252,"scores":{"vendor":7,"cna":9.8},"ingestedAt":"2026-09-14T15:23:07.472Z","slug":"CVE-2026-89702","body":"## Overview\n\nA flaw was found in the Linux kernel's Network File System Daemon (nfsd). When processing NFSv2/v3-over-UDP requests, the `nfsd_fh_verify` and `nfsd_fh_verify_err` tracepoints incorrectly size a memory buffer. This can lead to an out-of-bounds write, potentially allowing a remote attacker to cause a denial of service or disclose sensitive information from the kernel's ring buffer.\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 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89702.json)\n\n**kernel: nfsd: size fh_verify server sockaddr slot by xpt_locallen** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-15.\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\n## Remediation\n\nOut of support scope","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":202978,"id":"CVE-2026-89702","ts":1789403733203,"field":"cvss","old":"9.8","new":"7"},{"seq":202977,"id":"CVE-2026-89702","ts":1789403733203,"field":"severity","old":"critical","new":"high"},{"seq":197718,"id":"CVE-2026-89702","ts":1789384318533,"field":"cvss","old":"7","new":"9.8"},{"seq":197717,"id":"CVE-2026-89702","ts":1789384318533,"field":"severity","old":"high","new":"critical"},{"seq":183665,"id":"CVE-2026-89702","ts":1789356676845,"field":"cvss","old":"9.8","new":"7"},{"seq":183664,"id":"CVE-2026-89702","ts":1789356676845,"field":"severity","old":"critical","new":"high"},{"seq":153584,"id":"CVE-2026-89702","ts":1789285351379,"field":"cvss","old":null,"new":"9.8"},{"seq":153583,"id":"CVE-2026-89702","ts":1789285351379,"field":"severity","old":"none","new":"critical"},{"seq":147185,"id":"CVE-2026-89702","ts":1789270199688,"field":"cvss","old":null,"new":"7"},{"seq":147184,"id":"CVE-2026-89702","ts":1789270199688,"field":"severity","old":"none","new":"high"},{"seq":108942,"id":"CVE-2026-89702","ts":1789183729644,"field":"cvss","old":null,"new":"7"},{"seq":108941,"id":"CVE-2026-89702","ts":1789183729644,"field":"severity","old":"none","new":"high"}]}