{"id":"CVE-2026-89584","title":"kernel: block: validate user space vectors during extraction (CVE-2026-89584)","summary":"A flaw was found in the Linux kernel's block layer. This vulnerability arises from insufficient validation of user-space data structures (vectors) against the device's Direct Memory Access (DMA) alignment requirements. A local attacker cou…","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-1288","vendor":"Red Hat","product":"Red Hat Enterprise Linux 10","affected":["enterprise_linux 10"],"published":"2026-09-11","updated":"2026-09-18","sourceUpdated":"2026-09-18T18:31:46+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89584.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89584.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89584"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532265"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89584"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89584"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89584.mbox"},{"url":"https://git.kernel.org/stable/c/14b007e178811db72fbb1ebb3535160db6ec1e6a"},{"url":"https://git.kernel.org/stable/c/d44a97a3b1c00cc571245124e23e5ceb0a0225a0"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00154,"epssPercentile":0.0491,"scores":{"vendor":4.7,"cna":7.8},"ingestedAt":"2026-09-14T15:23:07.474Z","slug":"CVE-2026-89584","body":"## Overview\n\nA flaw was found in the Linux kernel's block layer. This vulnerability arises from insufficient validation of user-space data structures (vectors) against the device's Direct Memory Access (DMA) alignment requirements. A local attacker could exploit this by providing misaligned data, causing the system to reject the input with an error and potentially leading to a Denial of Service (DoS).\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-2026-89584.json)\n\n**kernel: block: validate user space vectors during extraction** — 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":208144,"id":"CVE-2026-89584","ts":1789922723926,"field":"cvss","old":"4.7","new":"7"},{"seq":208143,"id":"CVE-2026-89584","ts":1789922723926,"field":"severity","old":"medium","new":"high"},{"seq":202873,"id":"CVE-2026-89584","ts":1789403732757,"field":"cvss","old":"7.8","new":"4.7"},{"seq":202872,"id":"CVE-2026-89584","ts":1789403732757,"field":"severity","old":"high","new":"medium"},{"seq":197896,"id":"CVE-2026-89584","ts":1789384320853,"field":"cvss","old":"4.7","new":"7.8"},{"seq":197895,"id":"CVE-2026-89584","ts":1789384320853,"field":"severity","old":"medium","new":"high"},{"seq":183451,"id":"CVE-2026-89584","ts":1789356675421,"field":"cvss","old":"7.8","new":"4.7"},{"seq":183450,"id":"CVE-2026-89584","ts":1789356675421,"field":"severity","old":"high","new":"medium"},{"seq":153400,"id":"CVE-2026-89584","ts":1789285350361,"field":"cvss","old":null,"new":"7.8"},{"seq":153399,"id":"CVE-2026-89584","ts":1789285350361,"field":"severity","old":"none","new":"high"},{"seq":147474,"id":"CVE-2026-89584","ts":1789270211050,"field":"cvss","old":null,"new":"4.7"},{"seq":147473,"id":"CVE-2026-89584","ts":1789270211050,"field":"severity","old":"none","new":"medium"},{"seq":109226,"id":"CVE-2026-89584","ts":1789183730802,"field":"cvss","old":null,"new":"4.7"},{"seq":109225,"id":"CVE-2026-89584","ts":1789183730802,"field":"severity","old":"none","new":"medium"}]}