{"id":"CVE-2026-89648","title":"kernel: ceph: cap delegated inode count in ceph_parse_deleg_inos() (CVE-2026-89648)","summary":"A flaw was found in the Linux kernel's Ceph client. A malicious or compromised Ceph Metadata Server (MDS) could send a specially crafted reply with an unbounded number of delegated inode intervals. This could cause the client to enter an i…","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-606","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 8","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-14","sourceUpdated":"2026-09-14T16:47:08+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89648.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89648.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89648"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532046"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89648"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89648"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89648.mbox"},{"url":"https://git.kernel.org/stable/c/4bd3158bd62466d57ed72a3f7bc5f205fedd6919"},{"url":"https://git.kernel.org/stable/c/c040e139f1a629b767f900bbbc3f9892c290ed85"},{"url":"https://git.kernel.org/stable/c/f341270ac5f5077804d7837ce77b0f0df1cea29d"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00609,"epssPercentile":0.47533,"scores":{"vendor":5.9,"cna":7.5},"ingestedAt":"2026-09-14T15:23:07.473Z","slug":"CVE-2026-89648","body":"## Overview\n\nA flaw was found in the Linux kernel's Ceph client. A malicious or compromised Ceph Metadata Server (MDS) could send a specially crafted reply with an unbounded number of delegated inode intervals. This could cause the client to enter an infinite loop or exhaust memory resources, leading to a denial of service (DoS) for the client system.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, 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 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89648.json)\n\n**kernel: ceph: cap delegated inode count in ceph_parse_deleg_inos()** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-14.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\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 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- Red Hat Enterprise Linux 7\n\n## Remediation\n\nAffected","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":204246,"id":"CVE-2026-89648","ts":1789490240602,"field":"cvss","old":"5.9","new":"7"},{"seq":204245,"id":"CVE-2026-89648","ts":1789490240602,"field":"severity","old":"medium","new":"high"},{"seq":202838,"id":"CVE-2026-89648","ts":1789403732612,"field":"cvss","old":"7.5","new":"5.9"},{"seq":202837,"id":"CVE-2026-89648","ts":1789403732612,"field":"severity","old":"high","new":"medium"},{"seq":197805,"id":"CVE-2026-89648","ts":1789384320475,"field":"cvss","old":"5.9","new":"7.5"},{"seq":197804,"id":"CVE-2026-89648","ts":1789384320475,"field":"severity","old":"medium","new":"high"},{"seq":183389,"id":"CVE-2026-89648","ts":1789356675160,"field":"cvss","old":"7.5","new":"5.9"},{"seq":183388,"id":"CVE-2026-89648","ts":1789356675160,"field":"severity","old":"high","new":"medium"},{"seq":153494,"id":"CVE-2026-89648","ts":1789285350790,"field":"cvss","old":null,"new":"7.5"},{"seq":153493,"id":"CVE-2026-89648","ts":1789285350790,"field":"severity","old":"none","new":"high"},{"seq":147786,"id":"CVE-2026-89648","ts":1789270212285,"field":"cvss","old":null,"new":"5.9"},{"seq":147785,"id":"CVE-2026-89648","ts":1789270212285,"field":"severity","old":"none","new":"medium"},{"seq":109540,"id":"CVE-2026-89648","ts":1789183732339,"field":"cvss","old":null,"new":"5.9"},{"seq":109539,"id":"CVE-2026-89648","ts":1789183732339,"field":"severity","old":"none","new":"medium"}]}