{"id":"CVE-2026-89548","title":"kernel: SUNRPC: always drain cache_cleaner before destroying a cache_detail (CVE-2026-89548)","summary":"A flaw was found in the Linux kernel's SUNRPC component. When `sunrpc_destroy_cache_detail()` is called, it may not properly drain the `cache_cleaner` before freeing a `cache_detail` object. This oversight can lead to a use-after-free vuln…","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-825","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":"2026-09-15","sourceUpdated":"2026-09-15T14:05:47+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89548.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89548.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89548"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532450"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89548"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89548"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89548.mbox"},{"url":"https://git.kernel.org/stable/c/dec787a15c96a5665e9ffc61b429a6a4ab26e6b9"},{"url":"https://git.kernel.org/stable/c/5eea874a696201c31e7c2d7badbfa0d90e9961b5"},{"url":"https://git.kernel.org/stable/c/cf239de7fdcc8336259b01ea4bcf650dadad1040"},{"url":"https://git.kernel.org/stable/c/6d74ecc2be120a0c300b224b7649fe93c0453714"},{"url":"https://git.kernel.org/stable/c/9d44836f60c8c29bcdb1471fd9202387c642a890"},{"url":"https://git.kernel.org/stable/c/2e861ce2aaa468351a6a47c4cbb4971ebb740c7b"},{"url":"https://git.kernel.org/stable/c/3d60fdf951143d6ef4e352e2f8eb852286701726"},{"url":"https://git.kernel.org/stable/c/f42d0fda0c67695db6bc704b04b7c10240805377"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00125,"epssPercentile":0.02575,"scores":{"vendor":7,"cna":7.8},"ingestedAt":"2026-09-14T15:23:07.452Z","slug":"CVE-2026-89548","body":"## Overview\n\nA flaw was found in the Linux kernel's SUNRPC component. When `sunrpc_destroy_cache_detail()` is called, it may not properly drain the `cache_cleaner` before freeing a `cache_detail` object. This oversight can lead to a use-after-free vulnerability, where the system attempts to access or use memory that has already been deallocated. A local attacker could potentially exploit this to cause a denial of service or achieve privilege escalation.\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 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89548.json)\n\n**kernel: SUNRPC: always drain cache_cleaner before destroying a cache_detail** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-15.\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,"exploitation":0,"ransomware":0},"changes":[{"seq":203862,"id":"CVE-2026-89548","ts":1789490210261,"field":"cvss","old":"7.8","new":"7"},{"seq":197939,"id":"CVE-2026-89548","ts":1789384321048,"field":"cvss","old":"6.4","new":"7.8"},{"seq":197938,"id":"CVE-2026-89548","ts":1789384321048,"field":"severity","old":"medium","new":"high"},{"seq":183746,"id":"CVE-2026-89548","ts":1789356677214,"field":"cvss","old":"7.8","new":"6.4"},{"seq":183745,"id":"CVE-2026-89548","ts":1789356677214,"field":"severity","old":"high","new":"medium"},{"seq":153352,"id":"CVE-2026-89548","ts":1789285350163,"field":"cvss","old":null,"new":"7.8"},{"seq":153351,"id":"CVE-2026-89548","ts":1789285350163,"field":"severity","old":"none","new":"high"},{"seq":147193,"id":"CVE-2026-89548","ts":1789270200248,"field":"cvss","old":null,"new":"6.4"},{"seq":147192,"id":"CVE-2026-89548","ts":1789270200248,"field":"severity","old":"none","new":"medium"},{"seq":108948,"id":"CVE-2026-89548","ts":1789183729694,"field":"cvss","old":null,"new":"6.4"},{"seq":108947,"id":"CVE-2026-89548","ts":1789183729694,"field":"severity","old":"none","new":"medium"}]}