{"id":"CVE-2026-89652","title":"kernel: ceph: bound copied dentry name length in NFS export get_name (CVE-2026-89652)","summary":"A flaw was found in the Linux kernel's Ceph file system. A malicious or compromised Ceph Metadata Server (MDS) can send a specially crafted `LOOKUPNAME` reply that causes a buffer overflow when copying dentry names during an NFS export ope…","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-120","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 7","enterprise_linux 8","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-18","sourceUpdated":"2026-09-18T17:47:40+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89652.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89652.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89652"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532101"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89652"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89652"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89652.mbox"},{"url":"https://git.kernel.org/stable/c/a294064e0e0f81ea607b2f019e16888aa1b0a011"},{"url":"https://git.kernel.org/stable/c/61d9f27b191b838b96b697ce0bfaee39a138243a"},{"url":"https://git.kernel.org/stable/c/06fb5e623cdc2402d6bb29be94d9beb9a826ffec"},{"url":"https://git.kernel.org/stable/c/e7c2fd3893a7f7fcd7e8cf0b2c6348bb1e893df6"},{"url":"https://git.kernel.org/stable/c/eff8013c5a8916613c742ae5a2cc341cb605c0ae"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00463,"epssPercentile":0.39252,"scores":{"vendor":7,"cna":9.8},"ingestedAt":"2026-09-14T15:23:07.450Z","slug":"CVE-2026-89652","body":"## Overview\n\nA flaw was found in the Linux kernel's Ceph file system. A malicious or compromised Ceph Metadata Server (MDS) can send a specially crafted `LOOKUPNAME` reply that causes a buffer overflow when copying dentry names during an NFS export operation. This out-of-bounds write can lead to memory corruption on the client system, particularly when a CephFS mount is re-exported over NFS.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 10, 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 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, … · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89652.json)\n\n**kernel: ceph: bound copied dentry name length in NFS export get_name** — rated Important by Red Hat. Released 2026-09-11, updated 2026-09-18.\n\nAffected:\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\nNo fix planned:\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\nNot affected:\n\n- Red Hat Enterprise Linux 6\n\n## Remediation\n\nAffected","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":208154,"id":"CVE-2026-89652","ts":1789922725400,"field":"cvss","old":"9.8","new":"7"},{"seq":208153,"id":"CVE-2026-89652","ts":1789922725400,"field":"severity","old":"critical","new":"high"},{"seq":197793,"id":"CVE-2026-89652","ts":1789384318880,"field":"cvss","old":"7.4","new":"9.8"},{"seq":197792,"id":"CVE-2026-89652","ts":1789384318880,"field":"severity","old":"high","new":"critical"},{"seq":183713,"id":"CVE-2026-89652","ts":1789356677067,"field":"cvss","old":"9.8","new":"7.4"},{"seq":183712,"id":"CVE-2026-89652","ts":1789356677067,"field":"severity","old":"critical","new":"high"},{"seq":153502,"id":"CVE-2026-89652","ts":1789285350823,"field":"cvss","old":null,"new":"9.8"},{"seq":153501,"id":"CVE-2026-89652","ts":1789285350823,"field":"severity","old":"none","new":"critical"},{"seq":147762,"id":"CVE-2026-89652","ts":1789270212191,"field":"cvss","old":null,"new":"7.4"},{"seq":147761,"id":"CVE-2026-89652","ts":1789270212191,"field":"severity","old":"none","new":"high"},{"seq":109516,"id":"CVE-2026-89652","ts":1789183732246,"field":"cvss","old":null,"new":"7.4"},{"seq":109515,"id":"CVE-2026-89652","ts":1789183732246,"field":"severity","old":"none","new":"high"}]}