{"id":"CVE-2026-89671","title":"kernel: nfsd: gate nfs3 setacl by argp->mask (CVE-2026-89671)","summary":"A flaw was found in the Linux kernel's Network File System version 3 (NFSv3) server daemon (`nfsd`). The `nfsd3_proc_setacl()` function unconditionally processes Access Control List (ACL) update requests, even when the client's request doe…","severity":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:H","cvssSource":"vendor","cwe":["CWE-281","CWE-115"],"vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 6","enterprise_linux 7","enterprise_linux 8","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-10-25","sourceUpdated":"2026-10-25T21:07:02+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89671.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89671.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89671"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532394"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89671"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89671"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89671.mbox"},{"url":"https://kernelcve.org/list/?q=CVE-2026-89671"},{"url":"https://git.kernel.org/stable/c/3be1d8611dae4829e4608007db29f4a8748c37b2"},{"url":"https://git.kernel.org/stable/c/68a80b26efdff1d09f8ae1773c6a915abb9e191d"},{"url":"https://git.kernel.org/stable/c/b3bff820d068ea59767d4e91a3258231a879da5f"},{"url":"https://git.kernel.org/stable/c/ff99ed007f065198fd723152405c22aa558f700b"},{"url":"https://git.kernel.org/stable/c/453d7198a0ab07a12d46e0575861ac7b932da17e"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00501,"epssPercentile":0.42685,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-10-16T19:25:43.543380Z"},"scores":{"vendor":7,"cna":9.1},"ingestedAt":"2026-09-14T15:23:07.450Z","slug":"CVE-2026-89671","body":"## Overview\n\nA flaw was found in the Linux kernel's Network File System version 3 (NFSv3) server daemon (`nfsd`). The `nfsd3_proc_setacl()` function unconditionally processes Access Control List (ACL) update requests, even when the client's request does not specify an ACL to be set. A remote attacker could exploit this by sending a crafted `SETACL` request, leading to the unintended removal of a directory's default ACL or both access and default ACLs. This could result in unauthorized changes to file system permissions.\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 7, Red Hat Enterprise Linux 8, 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 7, Red Hat Enterprise Linux 8, … · updated 2026-10-25 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89671.json)\n\n**kernel: nfsd: gate nfs3 setacl by argp->mask** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-10-25.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\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\nNo fix planned:\n\n- Red Hat Enterprise Linux 6\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\n\nWorkarounds / mitigations:\n\n- Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":39.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":229490,"id":"CVE-2026-89671","ts":1793019794799,"field":"cvss","old":"9.1","new":"7.1"},{"seq":229489,"id":"CVE-2026-89671","ts":1793019794799,"field":"severity","old":"critical","new":"high"},{"seq":223248,"id":"CVE-2026-89671","ts":1792180030401,"field":"cvss","old":"7","new":"9.1"},{"seq":223247,"id":"CVE-2026-89671","ts":1792180030401,"field":"severity","old":"high","new":"critical"},{"seq":208498,"id":"CVE-2026-89671","ts":1790005720888,"field":"cvss","old":"9.1","new":"7"},{"seq":208497,"id":"CVE-2026-89671","ts":1790005720888,"field":"severity","old":"critical","new":"high"},{"seq":197764,"id":"CVE-2026-89671","ts":1789384318750,"field":"cvss","old":"6.8","new":"9.1"},{"seq":197763,"id":"CVE-2026-89671","ts":1789384318750,"field":"severity","old":"medium","new":"critical"},{"seq":183369,"id":"CVE-2026-89671","ts":1789356675077,"field":"cvss","old":"9.1","new":"6.8"},{"seq":183368,"id":"CVE-2026-89671","ts":1789356675077,"field":"severity","old":"critical","new":"medium"},{"seq":153536,"id":"CVE-2026-89671","ts":1789285351190,"field":"cvss","old":null,"new":"9.1"},{"seq":153535,"id":"CVE-2026-89671","ts":1789285351190,"field":"severity","old":"none","new":"critical"},{"seq":147269,"id":"CVE-2026-89671","ts":1789270205824,"field":"cvss","old":null,"new":"6.8"},{"seq":147268,"id":"CVE-2026-89671","ts":1789270205824,"field":"severity","old":"none","new":"medium"},{"seq":109026,"id":"CVE-2026-89671","ts":1789183730012,"field":"cvss","old":null,"new":"6.8"},{"seq":109025,"id":"CVE-2026-89671","ts":1789183730012,"field":"severity","old":"none","new":"medium"}]}