{"id":"CVE-2026-89501","title":"kernel: ring-buffer: Hold cpu_buffer::lock when resizing a subbuf (CVE-2026-89501)","summary":"A flaw was found in the Linux kernel's ring-buffer component. A race condition occurs when resizing a sub-buffer without properly holding the `cpu_buffer::lock`. This oversight can lead to concurrency issues with memory allocation and deal…","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-413","vendor":"Red Hat","product":"Red Hat Enterprise Linux 10","affected":["enterprise_linux 10"],"published":"2026-09-11","updated":"2026-09-18","sourceUpdated":"2026-09-18T21:28:45+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89501.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89501.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89501"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532254"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89501"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89501"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89501.mbox"},{"url":"https://git.kernel.org/stable/c/24974bd0da1b47fd56c975533ead50abf754e74d"},{"url":"https://git.kernel.org/stable/c/6fcb0b745a0b80df62eae4a93ce52a2d061f4ac2"},{"url":"https://git.kernel.org/stable/c/8a496aaa3da6e8d545896c2370c7e617cc931ae2"},{"url":"https://git.kernel.org/stable/c/bf242baf58de03467f226c8e29554c9495dca7fc"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00163,"epssPercentile":0.05949,"scores":{"vendor":7,"cna":7.8},"ingestedAt":"2026-09-14T15:23:07.475Z","slug":"CVE-2026-89501","body":"## Overview\n\nA flaw was found in the Linux kernel's ring-buffer component. A race condition occurs when resizing a sub-buffer without properly holding the `cpu_buffer::lock`. This oversight can lead to concurrency issues with memory allocation and deallocation operations, potentially resulting in system instability or a denial of service.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10 · no fix planned: Red Hat Enterprise Linux 10 · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89501.json)\n\n**kernel: ring-buffer: Hold cpu_buffer::lock when resizing a subbuf** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-18.\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\nAffected","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":206946,"id":"CVE-2026-89501","ts":1789749711555,"field":"cvss","old":"4.7","new":"7"},{"seq":206945,"id":"CVE-2026-89501","ts":1789749711555,"field":"severity","old":"medium","new":"high"},{"seq":202901,"id":"CVE-2026-89501","ts":1789403732870,"field":"cvss","old":"7.8","new":"4.7"},{"seq":202900,"id":"CVE-2026-89501","ts":1789403732870,"field":"severity","old":"high","new":"medium"},{"seq":197994,"id":"CVE-2026-89501","ts":1789384321294,"field":"cvss","old":"4.7","new":"7.8"},{"seq":197993,"id":"CVE-2026-89501","ts":1789384321294,"field":"severity","old":"medium","new":"high"},{"seq":183510,"id":"CVE-2026-89501","ts":1789356675664,"field":"cvss","old":"7.8","new":"4.7"},{"seq":183509,"id":"CVE-2026-89501","ts":1789356675664,"field":"severity","old":"high","new":"medium"},{"seq":153292,"id":"CVE-2026-89501","ts":1789285349913,"field":"cvss","old":null,"new":"7.8"},{"seq":153291,"id":"CVE-2026-89501","ts":1789285349913,"field":"severity","old":"none","new":"high"},{"seq":147496,"id":"CVE-2026-89501","ts":1789270211136,"field":"cvss","old":null,"new":"4.7"},{"seq":147495,"id":"CVE-2026-89501","ts":1789270211136,"field":"severity","old":"none","new":"medium"},{"seq":109250,"id":"CVE-2026-89501","ts":1789183731144,"field":"cvss","old":null,"new":"4.7"},{"seq":109249,"id":"CVE-2026-89501","ts":1789183731144,"field":"severity","old":"none","new":"medium"}]}