{"id":"CVE-2026-89673","title":"kernel: nfsd: fix XDR padding calculation in ff_encode_getdeviceinfo (CVE-2026-89673)","summary":"A flaw was found in the Linux kernel's NFS daemon (nfsd). A remote attacker could exploit an error in the XDR (External Data Representation) padding calculation within the `ff_encode_getdeviceinfo` function. This mismatch between reserved …","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-125","vendor":"Red Hat","product":"Red Hat OpenShift Container Platform 4","affected":["openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-16","sourceUpdated":"2026-09-16T12:14:07+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89673.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89673.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89673"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532322"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89673"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89673"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89673.mbox"},{"url":"https://git.kernel.org/stable/c/41ebca28e17f84293650598f86bd69532ec1a8e0"},{"url":"https://git.kernel.org/stable/c/62e5949f0dd5ec837af144860ff908369df4c7c9"},{"url":"https://git.kernel.org/stable/c/74015b7be806ad9e21d46f7bd2831df280c6c783"},{"url":"https://git.kernel.org/stable/c/8b989aaec85e1293a871d602590c951fe44b8647"},{"url":"https://git.kernel.org/stable/c/88bce7e326c368d7df15126ccac537e54bebd467"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.002,"epssPercentile":0.10101,"ingestedAt":"2026-09-14T15:23:07.450Z","slug":"CVE-2026-89673","body":"## Overview\n\nA flaw was found in the Linux kernel's NFS daemon (nfsd). A remote attacker could exploit an error in the XDR (External Data Representation) padding calculation within the `ff_encode_getdeviceinfo` function. This mismatch between reserved and actual data size leads to the leakage of stale reply-page content to the client, potentially disclosing sensitive information. It also causes misalignment in subsequent data decoding.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · updated 2026-09-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89673.json)\n\n**kernel: nfsd: fix XDR padding calculation in ff_encode_getdeviceinfo** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-16.\n\nNot affected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nRefer to the advisory for fix availability.","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":205450,"id":"CVE-2026-89673","ts":1789576718772,"field":"cvss","old":"5.9","new":"5.5"},{"seq":204003,"id":"CVE-2026-89673","ts":1789490231003,"field":"cvss","old":null,"new":"5.9"},{"seq":204002,"id":"CVE-2026-89673","ts":1789490231003,"field":"severity","old":"none","new":"medium"},{"seq":147363,"id":"CVE-2026-89673","ts":1789270210611,"field":"cvss","old":null,"new":"5.9"},{"seq":147362,"id":"CVE-2026-89673","ts":1789270210611,"field":"severity","old":"none","new":"medium"},{"seq":109118,"id":"CVE-2026-89673","ts":1789183730372,"field":"cvss","old":null,"new":"5.9"},{"seq":109117,"id":"CVE-2026-89673","ts":1789183730372,"field":"severity","old":"none","new":"medium"}]}