{"id":"CVE-2026-89457","title":"kernel: s390/dasd: Guard sysfs discipline callbacks against unallocated private data (CVE-2026-89457)","summary":"A flaw was found in the s390/dasd component of the Linux kernel. An unprivileged local user can trigger a null pointer dereference by reading specific world-readable sysfs attributes while the device is being brought online. This can lead …","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-476","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-14","sourceUpdated":"2026-09-14T18:25:35+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89457.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89457.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89457"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532055"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89457"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89457"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89457.mbox"},{"url":"https://git.kernel.org/stable/c/644b666c202cce12ccfcf9ded67089b18f4f7659"},{"url":"https://git.kernel.org/stable/c/4a042d8e5f34282577ece50515cea8bb1246914d"},{"url":"https://git.kernel.org/stable/c/bd8b4572528f9604a13bf3c7c2a167f5cf222f72"},{"url":"https://git.kernel.org/stable/c/57db27ccc162afe0726cffec0ae62e410ed2d0e9"},{"url":"https://git.kernel.org/stable/c/536407b272402af679155910d7fdeeb4834eefb9"},{"url":"https://git.kernel.org/stable/c/6452c13646af7c13d7f6668b6690cfb2427e7f7b"},{"url":"https://git.kernel.org/stable/c/449f3bada7a9fad8b8cdf4bb20baf27ee9ca56c5"},{"url":"https://git.kernel.org/stable/c/2a1780f9fc2493bd34c418a0be6fc58943afcecf"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00176,"epssPercentile":0.07436,"ingestedAt":"2026-09-14T15:23:07.453Z","slug":"CVE-2026-89457","body":"## Overview\n\nA flaw was found in the s390/dasd component of the Linux kernel. An unprivileged local user can trigger a null pointer dereference by reading specific world-readable sysfs attributes while the device is being brought online. This can lead to a kernel panic, resulting in a denial of service.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89457.json)\n\n**kernel: s390/dasd: Guard sysfs discipline callbacks against unallocated private data** — 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 9\n- Red Hat OpenShift Container Platform 4\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\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 OpenShift Container Platform 4\n\n## Remediation\n\nFix deferred","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":204207,"id":"CVE-2026-89457","ts":1789490240170,"field":"cvss","old":null,"new":"5.5"},{"seq":204206,"id":"CVE-2026-89457","ts":1789490240170,"field":"severity","old":"none","new":"medium"},{"seq":109564,"id":"CVE-2026-89457","ts":1789183732431,"field":"cvss","old":null,"new":"4.7"},{"seq":109563,"id":"CVE-2026-89457","ts":1789183732431,"field":"severity","old":"none","new":"medium"}]}