{"id":"CVE-2026-89496","title":"kernel: ocfs2: always run deallocs on copy-on-write completion (CVE-2026-89496)","summary":"A flaw was found in ocfs2, the Oracle Cluster File System, within the Linux kernel. A local user could exploit this vulnerability by performing a `copy_file_range()` operation within the same filesystem. This can lead to a memory leak, pot…","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-772","vendor":"Red Hat","product":"Linux","affected":["Linux >= 6f70fa519976a379d72781d927cf8e5f5b05ec86 < 5ff30f07def6d0e6edacf47952807b5ff60f3af6","Linux >= 6f70fa519976a379d72781d927cf8e5f5b05ec86 < 2753e12853ed2023555cec2c5fe22fbaabb2c0b7","Linux >= 6f70fa519976a379d72781d927cf8e5f5b05ec86 < f0261b3aca027f5c409a402ea22f6982750f911c","Linux >= 6f70fa519976a379d72781d927cf8e5f5b05ec86 < a4adaa722977f46511d4247172cd4ec991b80ff2","Linux >= 6f70fa519976a379d72781d927cf8e5f5b05ec86 < 123c050eb96aae0bab74c9f06c6ad3de7992722b","Linux >= 6f70fa519976a379d72781d927cf8e5f5b05ec86 < 71f07b7f90b3109c9098d1b9c8efbbeece5deb8a","Linux >= 6f70fa519976a379d72781d927cf8e5f5b05ec86 < 09e93a60e18e83a630ff84ae00cb564bab96ab1f","Linux >= 6f70fa519976a379d72781d927cf8e5f5b05ec86 < 82ea9d4fc05fb7a387db547c6a7c0aa6a3719616","Linux 2.6.32"],"published":"2026-09-11","updated":"2026-09-15","sourceUpdated":"2026-09-15T07:07:03+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89496.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89496.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89496"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532512"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89496"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89496"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89496.mbox"},{"url":"https://git.kernel.org/stable/c/5ff30f07def6d0e6edacf47952807b5ff60f3af6"},{"url":"https://git.kernel.org/stable/c/2753e12853ed2023555cec2c5fe22fbaabb2c0b7"},{"url":"https://git.kernel.org/stable/c/f0261b3aca027f5c409a402ea22f6982750f911c"},{"url":"https://git.kernel.org/stable/c/a4adaa722977f46511d4247172cd4ec991b80ff2"},{"url":"https://git.kernel.org/stable/c/123c050eb96aae0bab74c9f06c6ad3de7992722b"},{"url":"https://git.kernel.org/stable/c/71f07b7f90b3109c9098d1b9c8efbbeece5deb8a"},{"url":"https://git.kernel.org/stable/c/09e93a60e18e83a630ff84ae00cb564bab96ab1f"},{"url":"https://git.kernel.org/stable/c/82ea9d4fc05fb7a387db547c6a7c0aa6a3719616"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00176,"epssPercentile":0.07441,"ingestedAt":"2026-09-14T15:23:07.452Z","slug":"CVE-2026-89496","body":"## Overview\n\nA flaw was found in ocfs2, the Oracle Cluster File System, within the Linux kernel. A local user could exploit this vulnerability by performing a `copy_file_range()` operation within the same filesystem. This can lead to a memory leak, potentially causing resource exhaustion and a Denial of Service (DoS) on the system.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89496.json)\n\n**kernel: ocfs2: always run deallocs on copy-on-write completion** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-15.\n\nNot affected:\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\n## Remediation\n\nRefer to the advisory for fix availability.","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":203937,"id":"CVE-2026-89496","ts":1789490229049,"field":"cvss","old":null,"new":"5.5"},{"seq":203936,"id":"CVE-2026-89496","ts":1789490229049,"field":"severity","old":"none","new":"medium"},{"seq":147075,"id":"CVE-2026-89496","ts":1789270195063,"field":"cvss","old":null,"new":"5.5"},{"seq":147074,"id":"CVE-2026-89496","ts":1789270195063,"field":"severity","old":"none","new":"medium"}]}