{"id":"CVE-2026-89650","title":"kernel: ceph: bound num_export_targets array for mds info v2/v3 (CVE-2026-89650)","summary":"A flaw was found in the Linux kernel's Ceph client. A malicious or compromised Ceph monitor, or an on-path attacker, can send a specially crafted Metadata Server (MDS) map. This map, with an oversized num_export_targets field and a per-MDS…","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-125","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":"2026-09-18","sourceUpdated":"2026-09-18T17:38:55+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89650.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89650.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89650"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532105"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89650"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89650"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89650.mbox"},{"url":"https://git.kernel.org/stable/c/0c4bcc3ba7291d383b82ce1c2fe324f69a42da2d"},{"url":"https://git.kernel.org/stable/c/55a06b32438c222765138727d0a8164b103e8f0d"},{"url":"https://git.kernel.org/stable/c/eb3e1a1cb1634c76d59c5a9cb1a026fc69d40911"},{"url":"https://git.kernel.org/stable/c/3bf7dba8dba9a05774b846affec61a3624ddba38"},{"url":"https://git.kernel.org/stable/c/58c2d3e954c13694ef6e820a5e9456461bb9e7df"},{"url":"https://git.kernel.org/stable/c/332c444f4dc6fa1e8b8637c9e82d29e97f768656"},{"url":"https://git.kernel.org/stable/c/a3eb169ee297aa99670ba927c659990bd1e453f3"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00509,"epssPercentile":0.42443,"scores":{"vendor":7,"cna":9.1},"ingestedAt":"2026-09-14T15:23:07.450Z","slug":"CVE-2026-89650","body":"## Overview\n\nA flaw was found in the Linux kernel's Ceph client. A malicious or compromised Ceph monitor, or an on-path attacker, can send a specially crafted Metadata Server (MDS) map. This map, with an oversized num_export_targets field and a per-MDS info version of 2 or 3, can trigger an out-of-bounds read in the client kernel. This could lead to system instability or a denial of service.\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 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89650.json)\n\n**kernel: ceph: bound num_export_targets array for mds info v2/v3** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-18.\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":208158,"id":"CVE-2026-89650","ts":1789922725472,"field":"cvss","old":"9.1","new":"7"},{"seq":208157,"id":"CVE-2026-89650","ts":1789922725472,"field":"severity","old":"critical","new":"high"},{"seq":197797,"id":"CVE-2026-89650","ts":1789384318898,"field":"cvss","old":"7.5","new":"9.1"},{"seq":197796,"id":"CVE-2026-89650","ts":1789384318898,"field":"severity","old":"high","new":"critical"},{"seq":183379,"id":"CVE-2026-89650","ts":1789356675118,"field":"cvss","old":"9.1","new":"7.5"},{"seq":183378,"id":"CVE-2026-89650","ts":1789356675118,"field":"severity","old":"critical","new":"high"},{"seq":153498,"id":"CVE-2026-89650","ts":1789285350806,"field":"cvss","old":null,"new":"9.1"},{"seq":153497,"id":"CVE-2026-89650","ts":1789285350806,"field":"severity","old":"none","new":"critical"},{"seq":147788,"id":"CVE-2026-89650","ts":1789270212292,"field":"cvss","old":null,"new":"7.5"},{"seq":147787,"id":"CVE-2026-89650","ts":1789270212292,"field":"severity","old":"none","new":"high"},{"seq":109544,"id":"CVE-2026-89650","ts":1789183732354,"field":"cvss","old":null,"new":"7.5"},{"seq":109543,"id":"CVE-2026-89650","ts":1789183732354,"field":"severity","old":"none","new":"high"}]}