{"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":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H","cvssSource":"vendor","cwe":["CWE-20","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":"2026-10-23","sourceUpdated":"2026-10-23T03:59:17+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://kernelcve.org/list/?q=CVE-2026-89541"},{"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":0.00514,"epssPercentile":0.43606,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-10-16T19:23:27.526748Z"},"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 2026-10-23 · [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 2026-10-23.\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\n\nWorkarounds / mitigations:\n\n- Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":228186,"id":"CVE-2026-89541","ts":1792758174258,"field":"cvss","old":"9.8","new":"6.5"},{"seq":228185,"id":"CVE-2026-89541","ts":1792758174258,"field":"severity","old":"critical","new":"medium"},{"seq":223290,"id":"CVE-2026-89541","ts":1792180046961,"field":"cvss","old":"7","new":"9.8"},{"seq":223289,"id":"CVE-2026-89541","ts":1792180046961,"field":"severity","old":"high","new":"critical"},{"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"}]}