{"id":"CVE-2026-89690","title":"kernel: nfsd: defer vfree of compound ops to fix rpc_status UAF (CVE-2026-89690)","summary":"A flaw was found in the `nfsd` component of the Linux kernel. This vulnerability, a use-after-free, occurs when a specific memory buffer is prematurely released while another process is still trying to access it. This timing issue can lead…","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 9","affected":["enterprise_linux 10","enterprise_linux 9","openshift_container_platform 4","enterprise_linux 6"],"published":"2026-09-11","updated":"2026-09-21","sourceUpdated":"2026-09-21T11:41:24+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89690.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89690.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89690"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532103"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89690"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89690"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89690.mbox"},{"url":"https://git.kernel.org/stable/c/19413ccc45070a7270b9e25c2a258daf7f91de42"},{"url":"https://git.kernel.org/stable/c/48f72aff24f7a7329209dc6cbc27c869f3e3595c"},{"url":"https://git.kernel.org/stable/c/6703199f4d7e7f37d6a726a849eb358e8fae72fb"},{"url":"https://git.kernel.org/stable/c/fca26a3fc19ed02278aa2a150af82d43db0302cb"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00159,"epssPercentile":0.05436,"scores":{"vendor":8.1,"cna":7.8},"ingestedAt":"2026-09-14T15:23:07.473Z","slug":"CVE-2026-89690","body":"## Overview\n\nA flaw was found in the `nfsd` component of the Linux kernel. This vulnerability, a use-after-free, occurs when a specific memory buffer is prematurely released while another process is still trying to access it. This timing issue can lead to memory corruption. This could result in a system crash (denial of service) or potentially allow an attacker to gain elevated privileges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4, Red Hat Enterprise Linux 6 · no fix planned: 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-2026-89690.json)\n\n**kernel: nfsd: defer vfree of compound ops to fix rpc_status UAF** — rated Important 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 9\n- Red Hat OpenShift Container Platform 4\n- Red Hat Enterprise Linux 6\n\nNo fix planned:\n\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\nAffected","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":208465,"id":"CVE-2026-89690","ts":1790005708231,"field":"cvss","old":"8.1","new":"7"},{"seq":202976,"id":"CVE-2026-89690","ts":1789403733195,"field":"cvss","old":"7.8","new":"8.1"},{"seq":197733,"id":"CVE-2026-89690","ts":1789384318609,"field":"cvss","old":"8.1","new":"7.8"},{"seq":183671,"id":"CVE-2026-89690","ts":1789356676880,"field":"cvss","old":"7.8","new":"8.1"},{"seq":153570,"id":"CVE-2026-89690","ts":1789285351325,"field":"cvss","old":null,"new":"7.8"},{"seq":153569,"id":"CVE-2026-89690","ts":1789285351325,"field":"severity","old":"none","new":"high"},{"seq":147750,"id":"CVE-2026-89690","ts":1789270212146,"field":"cvss","old":null,"new":"8.1"},{"seq":147749,"id":"CVE-2026-89690","ts":1789270212146,"field":"severity","old":"none","new":"high"},{"seq":109508,"id":"CVE-2026-89690","ts":1789183732214,"field":"cvss","old":null,"new":"8.1"},{"seq":109507,"id":"CVE-2026-89690","ts":1789183732214,"field":"severity","old":"none","new":"high"}]}