{"id":"CVE-2026-89670","title":"kernel: nfsd: hold rcu across localio cmpxchg retry (CVE-2026-89670)","summary":"A flaw was found in the Linux kernel's Network File System Daemon (nfsd) component. A race condition exists in the `nfsd_open_local_fh()` function where an `nfsd_file` object can be freed and its memory recycled while another process attem…","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-825","vendor":"Red Hat","product":"Red Hat Enterprise Linux 10","affected":["enterprise_linux 10"],"published":"2026-09-11","updated":"2026-09-18","sourceUpdated":"2026-09-18T22:37:22+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89670.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89670.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89670"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532286"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89670"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89670"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89670.mbox"},{"url":"https://git.kernel.org/stable/c/559570f91a7d4d199a72105e4980bef791f4cbf1"},{"url":"https://git.kernel.org/stable/c/58884694978a3d7d111edb433d7fd6a6c5af2f34"},{"url":"https://git.kernel.org/stable/c/763c0bad872368304db718f79af7e93048885c67"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00161,"epssPercentile":0.05765,"scores":{"vendor":7.5,"cna":7.8},"ingestedAt":"2026-09-14T15:23:07.473Z","slug":"CVE-2026-89670","body":"## Overview\n\nA flaw was found in the Linux kernel's Network File System Daemon (nfsd) component. A race condition exists in the `nfsd_open_local_fh()` function where an `nfsd_file` object can be freed and its memory recycled while another process attempts to access it. This can lead to a use-after-free vulnerability, allowing an attacker to potentially cause memory corruption, disclose sensitive information, or execute arbitrary code.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10 · no fix planned: Red Hat Enterprise Linux 10 · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89670.json)\n\n**kernel: nfsd: hold rcu across localio cmpxchg retry** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-18.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 10\n\nNot affected:\n\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\nAffected","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":208075,"id":"CVE-2026-89670","ts":1789922704978,"field":"cvss","old":"7.5","new":"7"},{"seq":202987,"id":"CVE-2026-89670","ts":1789403733244,"field":"cvss","old":"7.8","new":"7.5"},{"seq":197773,"id":"CVE-2026-89670","ts":1789384318788,"field":"cvss","old":"7.5","new":"7.8"},{"seq":183692,"id":"CVE-2026-89670","ts":1789356676976,"field":"cvss","old":"7.8","new":"7.5"},{"seq":153534,"id":"CVE-2026-89670","ts":1789285351182,"field":"cvss","old":null,"new":"7.8"},{"seq":153533,"id":"CVE-2026-89670","ts":1789285351182,"field":"severity","old":"none","new":"high"},{"seq":147464,"id":"CVE-2026-89670","ts":1789270211011,"field":"cvss","old":null,"new":"7.5"},{"seq":147463,"id":"CVE-2026-89670","ts":1789270211011,"field":"severity","old":"none","new":"high"},{"seq":109216,"id":"CVE-2026-89670","ts":1789183730763,"field":"cvss","old":null,"new":"7.5"},{"seq":109215,"id":"CVE-2026-89670","ts":1789183730763,"field":"severity","old":"none","new":"high"}]}