{"id":"CVE-2026-89584","title":"block: validate user space vectors during extraction","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nblock: validate user space vectors during extraction\n\nThe bio-based drivers don't necessarily check the alignment split, and\nstacking block drivers don't always handle …","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","cwe":["CWE-1288"],"vendor":"Linux","product":"Linux","affected":["Linux >= 5ff3f74e145adc79b49668adb8de276446acf6be < d44a97a3b1c00cc571245124e23e5ceb0a0225a0","Linux >= 5ff3f74e145adc79b49668adb8de276446acf6be < 14b007e178811db72fbb1ebb3535160db6ec1e6a","Linux 6.18"],"published":"2026-09-11","updated":"2026-10-19","sourceUpdated":"2026-10-19T08:49:17.054Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89584","references":[{"url":"https://git.kernel.org/stable/c/d44a97a3b1c00cc571245124e23e5ceb0a0225a0"},{"url":"https://git.kernel.org/stable/c/14b007e178811db72fbb1ebb3535160db6ec1e6a"},{"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"}],"tags":["cve.org","csaf","vex","red-hat"],"epss":0.00165,"epssPercentile":0.0568,"scores":{"cna":7.8,"vendor":7},"ingestedAt":"2026-09-14T15:23:07.474Z","slug":"CVE-2026-89584","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nblock: validate user space vectors during extraction\n\nThe bio-based drivers don't necessarily check the alignment split, and\nstacking block drivers don't always handle a misalignment detected after\nsubmitting the bio. Validate user vectors against the device's\ndma_alignment as the bio is built from the iov_iter, rejecting\nmisaligned early with -EINVAL.\n\n## Affected\n\n- `Linux >= 5ff3f74e145adc79b49668adb8de276446acf6be < d44a97a3b1c00cc571245124e23e5ceb0a0225a0`\n- `Linux >= 5ff3f74e145adc79b49668adb8de276446acf6be < 14b007e178811db72fbb1ebb3535160db6ec1e6a`\n- `Linux 6.18`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\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)","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":224702,"id":"CVE-2026-89584","ts":1792401479153,"field":"cvss","old":"7","new":"7.8"},{"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"}]}