{"id":"CVE-2026-89442","title":"kernel: platform/x86: ISST: Validate socket ID in clos_assoc ioctl (CVE-2026-89442)","summary":"A flaw was found in the Linux kernel. The isst_if_clos_assoc ioctl function in the platform/x86: ISST module contains an improper validation of the socket_id. This allows a local attacker to cause an out-of-bounds access or a NULL pointer …","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":"2026-09-14T21:49:29+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89442.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89442.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89442"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532359"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89442"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89442"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89442.mbox"},{"url":"https://git.kernel.org/stable/c/c847ea4851ecfa3462cc711ded2c3c3dd8d08ab8"},{"url":"https://git.kernel.org/stable/c/0d90ab5f80e19cddfeb0c9fab47a1f34aa932075"},{"url":"https://git.kernel.org/stable/c/82e707eff9e3b7ef6d96ecc23ea8876d20c7d6ca"},{"url":"https://git.kernel.org/stable/c/207b4dc6eb100141b122b2602504a1429a4b6558"},{"url":"https://git.kernel.org/stable/c/a89f07db0cb95c54dac4a8406c79a04e44a73c3c"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00163,"epssPercentile":0.05939,"scores":{"vendor":5.5,"cna":7.8},"ingestedAt":"2026-09-14T15:23:07.453Z","slug":"CVE-2026-89442","body":"## Overview\n\nA flaw was found in the Linux kernel. The isst_if_clos_assoc ioctl function in the platform/x86: ISST module contains an improper validation of the socket_id. This allows a local attacker to cause an out-of-bounds access or a NULL pointer dereference. This could lead to a system crash, resulting in a Denial of Service (DoS).\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-2026-89442.json)\n\n**kernel: platform/x86: ISST: Validate socket ID in clos_assoc ioctl** — 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":204109,"id":"CVE-2026-89442","ts":1789490231605,"field":"cvss","old":"7.8","new":"5.5"},{"seq":204108,"id":"CVE-2026-89442","ts":1789490231605,"field":"severity","old":"high","new":"medium"},{"seq":198059,"id":"CVE-2026-89442","ts":1789384321600,"field":"cvss","old":"4.1","new":"7.8"},{"seq":198058,"id":"CVE-2026-89442","ts":1789384321600,"field":"severity","old":"medium","new":"high"},{"seq":183548,"id":"CVE-2026-89442","ts":1789356675838,"field":"cvss","old":"7.8","new":"4.1"},{"seq":183547,"id":"CVE-2026-89442","ts":1789356675838,"field":"severity","old":"high","new":"medium"},{"seq":153224,"id":"CVE-2026-89442","ts":1789285349620,"field":"cvss","old":null,"new":"7.8"},{"seq":153223,"id":"CVE-2026-89442","ts":1789285349620,"field":"severity","old":"none","new":"high"},{"seq":147339,"id":"CVE-2026-89442","ts":1789270210519,"field":"cvss","old":null,"new":"4.1"},{"seq":147338,"id":"CVE-2026-89442","ts":1789270210519,"field":"severity","old":"none","new":"medium"},{"seq":109094,"id":"CVE-2026-89442","ts":1789183730282,"field":"cvss","old":null,"new":"4.1"},{"seq":109093,"id":"CVE-2026-89442","ts":1789183730282,"field":"severity","old":"none","new":"medium"}]}