{"id":"CVE-2026-89546","title":"kernel: Linux Kernel: Resource management flaw in SUNRPC NFS callback service (CVE-2026-89546)","summary":"A flaw was found in the Linux kernel's SUNRPC (Sun Remote Procedure Call) Network File System (NFS) callback service. A race condition during the service teardown can lead to system resources not being properly released, causing a resource…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":"CWE-911","vendor":"Red Hat","product":"Red Hat OpenShift Container Platform 4","affected":["openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-13","sourceUpdated":"2026-09-13T06:57:19+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89546.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89546.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89546"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532175"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89546"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89546"},{"url":"https://git.kernel.org/stable/c/3674f780f47d2906b5a0f7199b66973067bdfeca"},{"url":"https://git.kernel.org/stable/c/6debde9e3e6ae21dcca75837b4247b13ca4ea2b8"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00516,"epssPercentile":0.42736,"scores":{"vendor":5.3,"cna":9.8},"ingestedAt":"2026-09-14T15:23:07.474Z","slug":"CVE-2026-89546","body":"## Overview\n\nA flaw was found in the Linux kernel's SUNRPC (Sun Remote Procedure Call) Network File System (NFS) callback service. A race condition during the service teardown can lead to system resources not being properly released, causing a resource leak. This issue could also result in a use-after-free vulnerability, where the system attempts to access memory that has already been deallocated. An attacker could potentially exploit this vulnerability to cause a denial of service, making the affected system unstable or unresponsive.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat OpenShift Container Platform 4 · updated 2026-09-13 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89546.json)\n\n**kernel: Linux Kernel: Resource management flaw in SUNRPC NFS callback service** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-13.\n\nAffected:\n\n- Red Hat OpenShift Container Platform 4\n\nNo fix planned:\n\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nFix deferred","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":202885,"id":"CVE-2026-89546","ts":1789403732806,"field":"cvss","old":"9.8","new":"5.3"},{"seq":202884,"id":"CVE-2026-89546","ts":1789403732806,"field":"severity","old":"critical","new":"medium"},{"seq":197951,"id":"CVE-2026-89546","ts":1789384321110,"field":"cvss","old":"5.3","new":"9.8"},{"seq":197950,"id":"CVE-2026-89546","ts":1789384321110,"field":"severity","old":"medium","new":"critical"},{"seq":183490,"id":"CVE-2026-89546","ts":1789356675584,"field":"cvss","old":"9.8","new":"5.3"},{"seq":183489,"id":"CVE-2026-89546","ts":1789356675584,"field":"severity","old":"critical","new":"medium"},{"seq":153348,"id":"CVE-2026-89546","ts":1789285350145,"field":"cvss","old":null,"new":"9.8"},{"seq":153347,"id":"CVE-2026-89546","ts":1789285350145,"field":"severity","old":"none","new":"critical"},{"seq":147650,"id":"CVE-2026-89546","ts":1789270211740,"field":"cvss","old":null,"new":"5.3"},{"seq":147649,"id":"CVE-2026-89546","ts":1789270211740,"field":"severity","old":"none","new":"medium"},{"seq":109404,"id":"CVE-2026-89546","ts":1789183731783,"field":"cvss","old":null,"new":"5.3"},{"seq":109403,"id":"CVE-2026-89546","ts":1789183731783,"field":"severity","old":"none","new":"medium"}]}