{"id":"CVE-2026-89574","title":"kernel: dm array: validate array block headers on read (CVE-2026-89574)","summary":"A flaw was found in the Linux kernel's device mapper (dm) array component. Insufficient validation of array block headers during read operations allows a local attacker to craft a malicious on-disk `nr_entries` value. This can lead to an o…","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-125","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 6","enterprise_linux 7","enterprise_linux 8","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-18","sourceUpdated":"2026-09-18T22:07:33+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89574.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89574.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89574"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532117"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89574"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89574"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89574.mbox"},{"url":"https://git.kernel.org/stable/c/2965787723084835b18dfe993cd450ebf5bd4540"},{"url":"https://git.kernel.org/stable/c/67adda7ed5da3e3b64f5b9021a02c21fb374fd9c"},{"url":"https://git.kernel.org/stable/c/9808ddffb4bc659352df3020cd84d9d864820ee5"},{"url":"https://git.kernel.org/stable/c/b33f76d33aaeacf3baf3370d8d64985169b36600"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00163,"epssPercentile":0.05936,"scores":{"vendor":5.1,"cna":7.8},"ingestedAt":"2026-09-14T15:23:07.474Z","slug":"CVE-2026-89574","body":"## Overview\n\nA flaw was found in the Linux kernel's device mapper (dm) array component. Insufficient validation of array block headers during read operations allows a local attacker to craft a malicious on-disk `nr_entries` value. This can lead to an out-of-bounds read from the `dm-bufio` buffer, potentially resulting in memory corruption or information disclosure.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, 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 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89574.json)\n\n**kernel: dm array: validate array block headers on read** — 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 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\nNo fix planned:\n\n- Red Hat Enterprise Linux 6\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\n## Remediation\n\nOut of support scope","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":208096,"id":"CVE-2026-89574","ts":1789922708105,"field":"cvss","old":"5.1","new":"5.5"},{"seq":202875,"id":"CVE-2026-89574","ts":1789403732765,"field":"cvss","old":"7.8","new":"5.1"},{"seq":202874,"id":"CVE-2026-89574","ts":1789403732765,"field":"severity","old":"high","new":"medium"},{"seq":197904,"id":"CVE-2026-89574","ts":1789384320886,"field":"cvss","old":"5.1","new":"7.8"},{"seq":197903,"id":"CVE-2026-89574","ts":1789384320886,"field":"severity","old":"medium","new":"high"},{"seq":183449,"id":"CVE-2026-89574","ts":1789356675413,"field":"cvss","old":"7.8","new":"5.1"},{"seq":183448,"id":"CVE-2026-89574","ts":1789356675413,"field":"severity","old":"high","new":"medium"},{"seq":153390,"id":"CVE-2026-89574","ts":1789285350321,"field":"cvss","old":null,"new":"7.8"},{"seq":153389,"id":"CVE-2026-89574","ts":1789285350321,"field":"severity","old":"none","new":"high"},{"seq":147704,"id":"CVE-2026-89574","ts":1789270211950,"field":"cvss","old":null,"new":"5.1"},{"seq":147703,"id":"CVE-2026-89574","ts":1789270211950,"field":"severity","old":"none","new":"medium"},{"seq":109458,"id":"CVE-2026-89574","ts":1789183731992,"field":"cvss","old":null,"new":"5.1"},{"seq":109457,"id":"CVE-2026-89574","ts":1789183731992,"field":"severity","old":"none","new":"medium"}]}