{"id":"CVE-2026-89545","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nsunrpc: defer rq_argp and rq_resp free until after RCU grace period\n\nsvc_rqst_free() frees rqstp->rq_argp and rqstp->rq_resp synchronously\nvia kfree(), but defers the r…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nsunrpc: defer rq_argp and rq_resp free until after RCU grace period\n\nsvc_rqst_free() frees rqstp->rq_argp and rqstp->rq_resp synchronously\nvia kfree(), but defers the r…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-366"],"vendor":"Linux","product":"Linux","affected":["Linux >= 812443865c5fc255363d4a684a62c086af1addca < 0ea49d69aa806008b2424c8cf21cf746b9963967","Linux >= 812443865c5fc255363d4a684a62c086af1addca < 08bc49e0541260bf294962cf889a32a2d2713ad6","Linux >= 812443865c5fc255363d4a684a62c086af1addca < e0c5693d3f9a5d4911735ab0e0eba4eecb1f1090","Linux >= 812443865c5fc255363d4a684a62c086af1addca < c479bde671cbe2f9e152834a8b0eb7c3c295bbaf","Linux 3.19"],"published":"2026-09-11","updated":"2026-09-21","sourceUpdated":"2026-09-21T14:17:23.150","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-89545","references":[{"url":"https://git.kernel.org/stable/c/08bc49e0541260bf294962cf889a32a2d2713ad6","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/0ea49d69aa806008b2424c8cf21cf746b9963967","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c479bde671cbe2f9e152834a8b0eb7c3c295bbaf","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e0c5693d3f9a5d4911735ab0e0eba4eecb1f1090","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89545.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89545"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532164"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89545"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89545"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00157,"epssPercentile":0.05261,"scores":{"nvd":7.8,"cna":7.8,"vendor":6.6},"ingestedAt":"2026-09-14T15:23:07.474Z","slug":"CVE-2026-89545","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nsunrpc: defer rq_argp and rq_resp free until after RCU grace period\n\nsvc_rqst_free() frees rqstp->rq_argp and rqstp->rq_resp synchronously\nvia kfree(), but defers the rqstp struct free via kfree_rcu().  After\nsvc_exit_thread() calls list_del_rcu() and svc_rqst_free(), there is\na window where RCU readers that started before list_del_rcu() can still\ntraverse the thread list and find the rqstp.  These readers (e.g.\nnfsd_nl_rpc_status_get_dumpit()) dereference rqstp->rq_argp, which has\nalready been freed — a use-after-free.\n\nFix this by moving the kfree of rq_argp and rq_resp into an explicit\ncall_rcu() callback alongside the struct free.  Resources not accessed\nby RCU readers (bvec, buffer pages, scratch folio, auth_data) remain\nsynchronously freed.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · 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-2026-89545.json)","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":208389,"id":"CVE-2026-89545","ts":1789997915713,"field":"cvss","old":"6.6","new":"7.8"},{"seq":208388,"id":"CVE-2026-89545","ts":1789997915713,"field":"severity","old":"medium","new":"high"},{"seq":203017,"id":"CVE-2026-89545","ts":1789403733363,"field":"cvss","old":"7.8","new":"6.6"},{"seq":203016,"id":"CVE-2026-89545","ts":1789403733363,"field":"severity","old":"high","new":"medium"},{"seq":197945,"id":"CVE-2026-89545","ts":1789384321077,"field":"cvss","old":"6.6","new":"7.8"},{"seq":197944,"id":"CVE-2026-89545","ts":1789384321077,"field":"severity","old":"medium","new":"high"},{"seq":183750,"id":"CVE-2026-89545","ts":1789356677231,"field":"cvss","old":"7.8","new":"6.6"},{"seq":183749,"id":"CVE-2026-89545","ts":1789356677231,"field":"severity","old":"high","new":"medium"},{"seq":153346,"id":"CVE-2026-89545","ts":1789285350137,"field":"cvss","old":null,"new":"7.8"},{"seq":153345,"id":"CVE-2026-89545","ts":1789285350137,"field":"severity","old":"none","new":"high"},{"seq":147654,"id":"CVE-2026-89545","ts":1789270211756,"field":"cvss","old":null,"new":"6.6"},{"seq":147653,"id":"CVE-2026-89545","ts":1789270211756,"field":"severity","old":"none","new":"medium"},{"seq":109412,"id":"CVE-2026-89545","ts":1789183731813,"field":"cvss","old":null,"new":"6.6"},{"seq":109411,"id":"CVE-2026-89545","ts":1789183731813,"field":"severity","old":"none","new":"medium"}]}