{"id":"CVE-2026-89646","title":"kernel: ceph: fix leaked inode reference on writeback abort at umount (CVE-2026-89646)","summary":"A flaw was found in the Ceph filesystem component of the Linux kernel. When a writeback operation is aborted during an unmount process, a reference to an inode (a data structure describing a filesystem object) is not properly released. Thi…","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-911","vendor":"Red Hat","product":"Red Hat Enterprise Linux 10","affected":["enterprise_linux 10"],"published":"2026-09-11","updated":"2026-09-15","sourceUpdated":"2026-09-15T08:12:17+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89646.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89646.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89646"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532514"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89646"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89646"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89646.mbox"},{"url":"https://git.kernel.org/stable/c/ac7a5a5385762df458d10cccc086a4e079be7409"},{"url":"https://git.kernel.org/stable/c/c25aee9c630fb86f98d79eccb75765067079b972"},{"url":"https://git.kernel.org/stable/c/ec32015a955c5d326c5e26610edfdcccd52f2314"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00173,"epssPercentile":0.0705,"scores":{"vendor":4.4,"cna":7.8},"ingestedAt":"2026-09-14T15:23:07.473Z","slug":"CVE-2026-89646","body":"## Overview\n\nA flaw was found in the Ceph filesystem component of the Linux kernel. When a writeback operation is aborted during an unmount process, a reference to an inode (a data structure describing a filesystem object) is not properly released. This prevents the inode from being evicted, potentially leading to a kernel bug and a denial of service (DoS) condition, where the system becomes unresponsive or crashes.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10 · no fix planned: Red Hat Enterprise Linux 10 · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89646.json)\n\n**kernel: ceph: fix leaked inode reference on writeback abort at umount** — rated Low by Red Hat. Released 2026-09-11, updated 2026-09-15.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 10\n\nNot affected:\n\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\n## Remediation\n\nFix deferred","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":203935,"id":"CVE-2026-89646","ts":1789490228347,"field":"cvss","old":"4.4","new":"5.5"},{"seq":202843,"id":"CVE-2026-89646","ts":1789403732636,"field":"cvss","old":"7.8","new":"4.4"},{"seq":202842,"id":"CVE-2026-89646","ts":1789403732636,"field":"severity","old":"high","new":"medium"},{"seq":197811,"id":"CVE-2026-89646","ts":1789384320500,"field":"cvss","old":"4.4","new":"7.8"},{"seq":197810,"id":"CVE-2026-89646","ts":1789384320500,"field":"severity","old":"medium","new":"high"},{"seq":183381,"id":"CVE-2026-89646","ts":1789356675127,"field":"cvss","old":"7.8","new":"4.4"},{"seq":183380,"id":"CVE-2026-89646","ts":1789356675127,"field":"severity","old":"high","new":"medium"},{"seq":153490,"id":"CVE-2026-89646","ts":1789285350773,"field":"cvss","old":null,"new":"7.8"},{"seq":153489,"id":"CVE-2026-89646","ts":1789285350773,"field":"severity","old":"none","new":"high"},{"seq":147073,"id":"CVE-2026-89646","ts":1789270195055,"field":"cvss","old":null,"new":"4.4"},{"seq":147072,"id":"CVE-2026-89646","ts":1789270195055,"field":"severity","old":"none","new":"medium"}]}