{"id":"CVE-2026-98454","title":"kernel: smb: client: fix create context out-of-bounds reads (CVE-2026-98454)","summary":"A flaw was found in the Linux kernel's Server Message Block (SMB) client. A malicious SMB server can exploit this vulnerability by sending malformed create context responses to a connecting system. Because the client fails to properly vali…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/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":"2026-10-18","updated":"2026-10-24","sourceUpdated":"2026-10-24T14:23:08+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98454.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98454.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98454"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2554892"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98454"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98454"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98454.mbox"},{"url":"https://git.kernel.org/stable/c/e4c49012708c917eafd9c27054b02d0f8b30fe64"},{"url":"https://git.kernel.org/stable/c/28bc9a871799363afa3139e961a8e3684feb8704"},{"url":"https://git.kernel.org/stable/c/05a7fd80024ff32b9b40ab1478bb172eeab1c386"},{"url":"https://git.kernel.org/stable/c/cecc5399987e73a528ce2b662eeb54af69163cbd"},{"url":"https://git.kernel.org/stable/c/67f4c1c6a1b51e203d986779299824d1c2c590a6"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00344,"epssPercentile":0.27773,"scores":{"vendor":6.5,"cna":8.1},"ingestedAt":"2026-10-18T15:45:12.304Z","slug":"CVE-2026-98454","body":"## Overview\n\nA flaw was found in the Linux kernel's Server Message Block (SMB) client. A malicious SMB server can exploit this vulnerability by sending malformed create context responses to a connecting system. Because the client fails to properly validate record boundaries during response parsing, this issue can trigger out-of-bounds memory reads, leading to a Denial of Service (DoS) or unauthorized information disclosure.\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 2026-10-24 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98454.json)\n\n**kernel: smb: client: fix create context out-of-bounds reads** — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-24.\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\nFix deferred","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":229543,"id":"CVE-2026-98454","ts":1793019839232,"field":"cvss","old":"8.1","new":"6.5"},{"seq":229542,"id":"CVE-2026-98454","ts":1793019839232,"field":"severity","old":"high","new":"medium"},{"seq":228978,"id":"CVE-2026-98454","ts":1792854127264,"field":"cvss","old":null,"new":"8.1"},{"seq":228977,"id":"CVE-2026-98454","ts":1792854127264,"field":"severity","old":"none","new":"high"}]}