{"id":"CVE-2026-89541","title":"kernel: SUNRPC: harden gss_unwrap_resp_priv length checks (CVE-2026-89541)","summary":"A flaw was found in the Linux kernel. Specifically, an integer overflow vulnerability exists in the `gss_unwrap_resp_priv()` function within the SUNRPC component. This flaw occurs when validating the length of RPCSEC_GSS opaque data. A mal…","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 6","enterprise_linux 7","enterprise_linux 8","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-18","sourceUpdated":"2026-09-18T21:56:11+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89541.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89541.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89541"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532224"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89541"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89541"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89541.mbox"},{"url":"https://git.kernel.org/stable/c/3691c4b3488d8ca046b9941e5be30c626dbbbb50"},{"url":"https://git.kernel.org/stable/c/85fa6b12e8f439739ac36ef2aad925f37c8b976a"},{"url":"https://git.kernel.org/stable/c/401f6a5b338d05bb1069ad814d9f77e3c367854f"},{"url":"https://git.kernel.org/stable/c/81fd7654a8429718adfcb2a7e03496077f547ed0"},{"url":"https://git.kernel.org/stable/c/89a15a50f84d32d4b99db86f957427fcbe20a99a"},{"url":"https://git.kernel.org/stable/c/ebcbd2523a8524c3d24e111cdbed8e271d910269"},{"url":"https://git.kernel.org/stable/c/d395c30d570ca6168f0297b191709927d1258273"},{"url":"https://git.kernel.org/stable/c/87831b92112c81db251d46756d65daa4f91af6a2"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00521,"epssPercentile":0.43234,"scores":{"vendor":7,"cna":9.8},"ingestedAt":"2026-09-14T15:23:07.452Z","slug":"CVE-2026-89541","body":"## Overview\n\nA flaw was found in the Linux kernel. Specifically, an integer overflow vulnerability exists in the `gss_unwrap_resp_priv()` function within the SUNRPC component. This flaw occurs when validating the length of RPCSEC_GSS opaque data. A malicious krb5p Network File System (NFS) server can send a specially crafted RPCSEC_GSS reply, leading to an out-of-bounds read. This could potentially result in information disclosure or a denial of service (DoS) on the client system.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89541.json)\n\n**kernel: SUNRPC: harden gss_unwrap_resp_priv length checks** — 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 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\nNo fix planned:\n\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 10\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\nOut of support scope","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":208106,"id":"CVE-2026-89541","ts":1789922710726,"field":"cvss","old":"9.8","new":"7"},{"seq":208105,"id":"CVE-2026-89541","ts":1789922710726,"field":"severity","old":"critical","new":"high"},{"seq":197949,"id":"CVE-2026-89541","ts":1789384321100,"field":"cvss","old":"5.9","new":"9.8"},{"seq":197948,"id":"CVE-2026-89541","ts":1789384321100,"field":"severity","old":"medium","new":"critical"},{"seq":183752,"id":"CVE-2026-89541","ts":1789356677240,"field":"cvss","old":"9.8","new":"5.9"},{"seq":183751,"id":"CVE-2026-89541","ts":1789356677240,"field":"severity","old":"critical","new":"medium"},{"seq":153340,"id":"CVE-2026-89541","ts":1789285350113,"field":"cvss","old":null,"new":"9.8"},{"seq":153339,"id":"CVE-2026-89541","ts":1789285350113,"field":"severity","old":"none","new":"critical"},{"seq":147588,"id":"CVE-2026-89541","ts":1789270211499,"field":"cvss","old":null,"new":"5.9"},{"seq":147587,"id":"CVE-2026-89541","ts":1789270211499,"field":"severity","old":"none","new":"medium"},{"seq":109344,"id":"CVE-2026-89541","ts":1789183731517,"field":"cvss","old":null,"new":"5.9"},{"seq":109343,"id":"CVE-2026-89541","ts":1789183731517,"field":"severity","old":"none","new":"medium"}]}