{"id":"CVE-2026-89632","title":"kernel: smb: client: fix use-before-check of ReparseDataLength in reparse_buf_ptr() (CVE-2026-89632)","summary":"A flaw was found in the Linux kernel's Server Message Block (SMB) client. A malicious server could exploit this vulnerability by sending specially crafted data, leading to an out-of-bounds read. This occurs because the `reparse_buf_ptr()` …","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-125","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 8","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-18","sourceUpdated":"2026-09-18T20:12:42+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89632.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89632.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89632"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532415"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89632"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89632"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89632.mbox"},{"url":"https://git.kernel.org/stable/c/05f78e6cf34ea3a285053bd5999e08e8ac298bd5"},{"url":"https://git.kernel.org/stable/c/711cf71300d7992f450600df8864917d3538679f"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00318,"epssPercentile":0.24931,"scores":{"vendor":6.3,"cna":8.2},"ingestedAt":"2026-09-14T15:23:07.473Z","slug":"CVE-2026-89632","body":"## Overview\n\nA flaw was found in the Linux kernel's Server Message Block (SMB) client. A malicious server could exploit this vulnerability by sending specially crafted data, leading to an out-of-bounds read. This occurs because the `reparse_buf_ptr()` function reads data before properly validating the buffer size, allowing it to access memory beyond the intended boundary.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89632.json)\n\n**kernel: smb: client: fix use-before-check of ReparseDataLength in reparse_buf_ptr()** — 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 8\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 8\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\n## Remediation\n\nAffected","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":208116,"id":"CVE-2026-89632","ts":1789922715795,"field":"cvss","old":"6.3","new":"7"},{"seq":208115,"id":"CVE-2026-89632","ts":1789922715795,"field":"severity","old":"medium","new":"high"},{"seq":202847,"id":"CVE-2026-89632","ts":1789403732652,"field":"cvss","old":"8.2","new":"6.3"},{"seq":202846,"id":"CVE-2026-89632","ts":1789403732652,"field":"severity","old":"high","new":"medium"},{"seq":197838,"id":"CVE-2026-89632","ts":1789384320611,"field":"cvss","old":"6.3","new":"8.2"},{"seq":197837,"id":"CVE-2026-89632","ts":1789384320611,"field":"severity","old":"medium","new":"high"},{"seq":183393,"id":"CVE-2026-89632","ts":1789356675177,"field":"cvss","old":"8.2","new":"6.3"},{"seq":183392,"id":"CVE-2026-89632","ts":1789356675177,"field":"severity","old":"high","new":"medium"},{"seq":153468,"id":"CVE-2026-89632","ts":1789285350639,"field":"cvss","old":null,"new":"8.2"},{"seq":153467,"id":"CVE-2026-89632","ts":1789285350639,"field":"severity","old":"none","new":"high"},{"seq":147213,"id":"CVE-2026-89632","ts":1789270201695,"field":"cvss","old":null,"new":"6.3"},{"seq":147212,"id":"CVE-2026-89632","ts":1789270201695,"field":"severity","old":"none","new":"medium"},{"seq":108968,"id":"CVE-2026-89632","ts":1789183729774,"field":"cvss","old":null,"new":"6.3"},{"seq":108967,"id":"CVE-2026-89632","ts":1789183729774,"field":"severity","old":"none","new":"medium"}]}