{"id":"CVE-2026-89654","title":"kernel: ceph: fix UAF in check_new_map() on session freed during unlock (CVE-2026-89654)","summary":"A flaw was found in the Ceph file system component of the Linux kernel. A race condition exists in the `check_new_map()` function during session handling. This allows a local attacker to exploit a use-after-free vulnerability by freeing a …","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-364","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 7","enterprise_linux 8","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-14","sourceUpdated":"2026-09-14T16:47:13+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89654.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89654.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89654"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532045"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89654"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89654"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89654.mbox"},{"url":"https://git.kernel.org/stable/c/21d5be092d947f8d83f76f7ebf3989e7e9230a98"},{"url":"https://git.kernel.org/stable/c/ee611a7509554c4ca1f54f6aefe592fb1df7ea70"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00407,"epssPercentile":0.34635,"scores":{"vendor":4.7,"cna":9.8},"ingestedAt":"2026-09-14T15:23:07.473Z","slug":"CVE-2026-89654","body":"## Overview\n\nA flaw was found in the Ceph file system component of the Linux kernel. A race condition exists in the `check_new_map()` function during session handling. This allows a local attacker to exploit a use-after-free vulnerability by freeing a session while another thread attempts to access it. This could lead to a denial of service or potentially arbitrary code execution.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, 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 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, … · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89654.json)\n\n**kernel: ceph: fix UAF in check_new_map() on session freed during unlock** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-14.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\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\nNo fix planned:\n\n- Red Hat Enterprise Linux 10\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\nNot affected:\n\n- Red Hat Enterprise Linux 6\n\n## Remediation\n\nAffected","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":204244,"id":"CVE-2026-89654","ts":1789490240594,"field":"cvss","old":"4.7","new":"7"},{"seq":204243,"id":"CVE-2026-89654","ts":1789490240594,"field":"severity","old":"medium","new":"high"},{"seq":202836,"id":"CVE-2026-89654","ts":1789403732604,"field":"cvss","old":"9.8","new":"4.7"},{"seq":202835,"id":"CVE-2026-89654","ts":1789403732604,"field":"severity","old":"critical","new":"medium"},{"seq":197799,"id":"CVE-2026-89654","ts":1789384318908,"field":"cvss","old":"4.7","new":"9.8"},{"seq":197798,"id":"CVE-2026-89654","ts":1789384318908,"field":"severity","old":"medium","new":"critical"},{"seq":183383,"id":"CVE-2026-89654","ts":1789356675135,"field":"cvss","old":"9.8","new":"4.7"},{"seq":183382,"id":"CVE-2026-89654","ts":1789356675135,"field":"severity","old":"critical","new":"medium"},{"seq":153506,"id":"CVE-2026-89654","ts":1789285351035,"field":"cvss","old":null,"new":"9.8"},{"seq":153505,"id":"CVE-2026-89654","ts":1789285351035,"field":"severity","old":"none","new":"critical"},{"seq":147778,"id":"CVE-2026-89654","ts":1789270212253,"field":"cvss","old":null,"new":"4.7"},{"seq":147777,"id":"CVE-2026-89654","ts":1789270212253,"field":"severity","old":"none","new":"medium"},{"seq":109538,"id":"CVE-2026-89654","ts":1789183732331,"field":"cvss","old":null,"new":"4.7"},{"seq":109537,"id":"CVE-2026-89654","ts":1789183732331,"field":"severity","old":"none","new":"medium"}]}