{"id":"CVE-2026-89677","title":"kernel: nfsd: fix possible fh_compose of wrong dentry in nfsd4_create_file() (CVE-2026-89677)","summary":"A flaw was found in the Linux kernel's Network File System Daemon (nfsd). When creating files, the `dentry_create()` function could return an unexpected directory entry (dentry). This could lead to a previously stored dentry being prematur…","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 6","affected":["enterprise_linux 6"],"published":"2026-09-11","updated":"2026-09-15","sourceUpdated":"2026-09-15T10:22:15+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89677.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89677.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89677"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532419"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89677"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89677"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89677.mbox"},{"url":"https://git.kernel.org/stable/c/033e783709ce99662cf81f6abcad746a8da9d35f"},{"url":"https://git.kernel.org/stable/c/3e2c79360c6a89975ec5b5a7d4ef937e4db91a27"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00407,"epssPercentile":0.3473,"scores":{"vendor":6.8,"cna":9.8},"ingestedAt":"2026-09-14T15:23:07.473Z","slug":"CVE-2026-89677","body":"## Overview\n\nA flaw was found in the Linux kernel's Network File System Daemon (nfsd). When creating files, the `dentry_create()` function could return an unexpected directory entry (dentry). This could lead to a previously stored dentry being prematurely freed and then used again, potentially causing memory corruption or a denial of service (DoS) due to an invalid memory access.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 6 · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89677.json)\n\n**kernel: nfsd: fix possible fh_compose of wrong dentry in nfsd4_create_file()** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-15.\n\nAffected:\n\n- Red Hat Enterprise Linux 6\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 6\n\nNot affected:\n\n- Red Hat Enterprise Linux 10\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\nOut of support scope","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":203920,"id":"CVE-2026-89677","ts":1789490221833,"field":"cvss","old":"6.8","new":"7"},{"seq":203919,"id":"CVE-2026-89677","ts":1789490221833,"field":"severity","old":"medium","new":"high"},{"seq":202989,"id":"CVE-2026-89677","ts":1789403733252,"field":"cvss","old":"9.8","new":"6.8"},{"seq":202988,"id":"CVE-2026-89677","ts":1789403733252,"field":"severity","old":"critical","new":"medium"},{"seq":197758,"id":"CVE-2026-89677","ts":1789384318725,"field":"cvss","old":"6.8","new":"9.8"},{"seq":197757,"id":"CVE-2026-89677","ts":1789384318725,"field":"severity","old":"medium","new":"critical"},{"seq":183685,"id":"CVE-2026-89677","ts":1789356676942,"field":"cvss","old":"9.8","new":"6.8"},{"seq":183684,"id":"CVE-2026-89677","ts":1789356676942,"field":"severity","old":"critical","new":"medium"},{"seq":153546,"id":"CVE-2026-89677","ts":1789285351230,"field":"cvss","old":null,"new":"9.8"},{"seq":153545,"id":"CVE-2026-89677","ts":1789285351230,"field":"severity","old":"none","new":"critical"},{"seq":147245,"id":"CVE-2026-89677","ts":1789270204039,"field":"cvss","old":null,"new":"6.8"},{"seq":147244,"id":"CVE-2026-89677","ts":1789270204039,"field":"severity","old":"none","new":"medium"},{"seq":109002,"id":"CVE-2026-89677","ts":1789183729909,"field":"cvss","old":null,"new":"6.8"},{"seq":109001,"id":"CVE-2026-89677","ts":1789183729909,"field":"severity","old":"none","new":"medium"}]}