{"id":"CVE-2026-89499","title":"kernel: ring-buffer: Stop remote reader update when page swap fails (CVE-2026-89499)","summary":"A flaw was found in the Linux kernel's ring-buffer component. When a remote reader update fails during a page swap, the system incorrectly proceeds as if the swap succeeded. This can lead to log flooding, potentially causing a denial of se…","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-390","vendor":"Red Hat","product":"Red Hat OpenShift Container Platform 4","affected":["openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-15","sourceUpdated":"2026-09-15T05:46:52+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89499.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89499.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89499"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532499"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89499"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89499"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89499.mbox"},{"url":"https://git.kernel.org/stable/c/5eab74874d11160725c42ab676ba97a797a362eb"},{"url":"https://git.kernel.org/stable/c/a14a97048e48471e283d76879b83d2ae323e0722"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.0012,"epssPercentile":0.0212,"scores":{"vendor":5.5,"cna":7.8},"ingestedAt":"2026-09-14T15:23:07.475Z","slug":"CVE-2026-89499","body":"## Overview\n\nA flaw was found in the Linux kernel's ring-buffer component. When a remote reader update fails during a page swap, the system incorrectly proceeds as if the swap succeeded. This can lead to log flooding, potentially causing a denial of service by exhausting system resources or hindering system diagnostics.\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-2026-89499.json)\n\n**kernel: ring-buffer: Stop remote reader update when page swap fails** — 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":202893,"id":"CVE-2026-89499","ts":1789403732838,"field":"cvss","old":"7.8","new":"5.5"},{"seq":202892,"id":"CVE-2026-89499","ts":1789403732838,"field":"severity","old":"high","new":"medium"},{"seq":198002,"id":"CVE-2026-89499","ts":1789384321328,"field":"cvss","old":"5.5","new":"7.8"},{"seq":198001,"id":"CVE-2026-89499","ts":1789384321328,"field":"severity","old":"medium","new":"high"},{"seq":183512,"id":"CVE-2026-89499","ts":1789356675671,"field":"cvss","old":"7.8","new":"5.5"},{"seq":183511,"id":"CVE-2026-89499","ts":1789356675671,"field":"severity","old":"high","new":"medium"},{"seq":153288,"id":"CVE-2026-89499","ts":1789285349897,"field":"cvss","old":null,"new":"7.8"},{"seq":153287,"id":"CVE-2026-89499","ts":1789285349897,"field":"severity","old":"none","new":"high"},{"seq":147123,"id":"CVE-2026-89499","ts":1789270195265,"field":"cvss","old":null,"new":"5.5"},{"seq":147122,"id":"CVE-2026-89499","ts":1789270195265,"field":"severity","old":"none","new":"medium"},{"seq":108870,"id":"CVE-2026-89499","ts":1789183729336,"field":"cvss","old":null,"new":"5.5"},{"seq":108869,"id":"CVE-2026-89499","ts":1789183729336,"field":"severity","old":"none","new":"medium"}]}