{"id":"CVE-2026-89647","title":"kernel: ceph: do not repeat ceph_trim_dentries() if no progress possible (CVE-2026-89647)","summary":"A flaw was found in the Linux kernel's Ceph file system. The `ceph_trim_dentries()` function, when invoked by `ceph_cap_reclaim_work()`, can enter an infinite loop under specific conditions where no leases need to be reclaimed. This busy l…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":"CWE-835","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":"2026-09-18","sourceUpdated":"2026-09-18T16:54:26+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89647.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89647.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89647"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532249"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89647"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89647"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89647.mbox"},{"url":"https://git.kernel.org/stable/c/37d6edb2f03b29399a3a337fae78674de51e1695"},{"url":"https://git.kernel.org/stable/c/3d122b2feb1dd76bb5041bdea5e1e1b007d8d415"},{"url":"https://git.kernel.org/stable/c/5a541eb401acb89d791da41189d7a79220164b93"},{"url":"https://git.kernel.org/stable/c/e7d7aa7b730178278109c41fa1b17b06873065d5"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.0063,"epssPercentile":0.48483,"scores":{"vendor":4.7,"cna":7.5},"ingestedAt":"2026-09-14T15:23:07.473Z","slug":"CVE-2026-89647","body":"## Overview\n\nA flaw was found in the Linux kernel's Ceph file system. The `ceph_trim_dentries()` function, when invoked by `ceph_cap_reclaim_work()`, can enter an infinite loop under specific conditions where no leases need to be reclaimed. This busy loop causes excessive CPU utilization, potentially leading to a Denial of Service (DoS) for affected systems.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Low · 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 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89647.json)\n\n**kernel: ceph: do not repeat ceph_trim_dentries() if no progress possible** — rated Low 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 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\nFix deferred","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":208160,"id":"CVE-2026-89647","ts":1789922725678,"field":"cvss","old":"4.7","new":"5.5"},{"seq":202840,"id":"CVE-2026-89647","ts":1789403732620,"field":"cvss","old":"7.5","new":"4.7"},{"seq":202839,"id":"CVE-2026-89647","ts":1789403732620,"field":"severity","old":"high","new":"medium"},{"seq":197807,"id":"CVE-2026-89647","ts":1789384320484,"field":"cvss","old":"4.7","new":"7.5"},{"seq":197806,"id":"CVE-2026-89647","ts":1789384320484,"field":"severity","old":"medium","new":"high"},{"seq":183385,"id":"CVE-2026-89647","ts":1789356675144,"field":"cvss","old":"7.5","new":"4.7"},{"seq":183384,"id":"CVE-2026-89647","ts":1789356675144,"field":"severity","old":"high","new":"medium"},{"seq":153492,"id":"CVE-2026-89647","ts":1789285350781,"field":"cvss","old":null,"new":"7.5"},{"seq":153491,"id":"CVE-2026-89647","ts":1789285350781,"field":"severity","old":"none","new":"high"},{"seq":147494,"id":"CVE-2026-89647","ts":1789270211129,"field":"cvss","old":null,"new":"4.7"},{"seq":147493,"id":"CVE-2026-89647","ts":1789270211129,"field":"severity","old":"none","new":"medium"},{"seq":109246,"id":"CVE-2026-89647","ts":1789183731129,"field":"cvss","old":null,"new":"4.7"},{"seq":109245,"id":"CVE-2026-89647","ts":1789183731129,"field":"severity","old":"none","new":"medium"}]}