{"id":"CVE-2026-89547","title":"kernel: SUNRPC: Check svc pool percpu counter allocation (CVE-2026-89547)","summary":"A flaw was found in the Linux kernel's SUNRPC component. A local administrator, under specific conditions of memory pressure or fault injection during RPC server startup, can trigger a failure in per-CPU counter allocation. This failure le…","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-476","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 6","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-14","sourceUpdated":"2026-09-14T15:20:44+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89547.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89547.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89547"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532039"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89547"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89547"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89547.mbox"},{"url":"https://git.kernel.org/stable/c/57ac7d899409b0a9b768cf417e3bb86bcca3d4c6"},{"url":"https://git.kernel.org/stable/c/3a2b7649de76376a69f1d3ed2a539fb15907cd4d"},{"url":"https://git.kernel.org/stable/c/bd1ef2cfb44d72b7aa6943e87b206eb0e30fbd0c"},{"url":"https://git.kernel.org/stable/c/b541a15046976e481618726cc23db0fb22d576db"},{"url":"https://git.kernel.org/stable/c/43e11e164704dde975c9edb370de1a06bec67270"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00568,"epssPercentile":0.44657,"scores":{"vendor":7,"cna":8.1},"ingestedAt":"2026-09-14T15:23:07.452Z","slug":"CVE-2026-89547","body":"## Overview\n\nA flaw was found in the Linux kernel's SUNRPC component. A local administrator, under specific conditions of memory pressure or fault injection during RPC server startup, can trigger a failure in per-CPU counter allocation. This failure leads to uninitialized counters, which, when subsequently accessed, can silently corrupt data in the current CPU's per-CPU area. This corruption could lead to system instability or a denial of service.\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 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89547.json)\n\n**kernel: SUNRPC: Check svc pool percpu counter allocation** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-14.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 6\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 9\n- Red Hat OpenShift Container Platform 4\n\nNot affected:\n\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\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":202753,"id":"CVE-2026-89547","ts":1789403715629,"field":"cvss","old":"8.1","new":"7"},{"seq":197941,"id":"CVE-2026-89547","ts":1789384321056,"field":"cvss","old":"4.7","new":"8.1"},{"seq":197940,"id":"CVE-2026-89547","ts":1789384321056,"field":"severity","old":"medium","new":"high"},{"seq":183483,"id":"CVE-2026-89547","ts":1789356675551,"field":"cvss","old":"8.1","new":"4.7"},{"seq":183482,"id":"CVE-2026-89547","ts":1789356675551,"field":"severity","old":"high","new":"medium"},{"seq":153350,"id":"CVE-2026-89547","ts":1789285350154,"field":"cvss","old":null,"new":"8.1"},{"seq":153349,"id":"CVE-2026-89547","ts":1789285350154,"field":"severity","old":"none","new":"high"},{"seq":109612,"id":"CVE-2026-89547","ts":1789183732643,"field":"cvss","old":null,"new":"4.7"},{"seq":109611,"id":"CVE-2026-89547","ts":1789183732643,"field":"severity","old":"none","new":"medium"}]}