{"id":"CVE-2026-89703","title":"nfsd: set SC_STATUS_FREED in nfsd4_drop_revoked_stid for delegations","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: set SC_STATUS_FREED in nfsd4_drop_revoked_stid for delegations\n\nnfsd4_drop_revoked_stid() handles FREE_STATEID for admin-revoked\ndelegations but does not set SC_S…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","cwe":["CWE-825"],"vendor":"Linux","product":"Linux","affected":["Linux >= 8dd91e8d31febf4d9cca3ae1bb4771d33ae7ee5a < d832a0587528853d45481d1faf75d4b5d062adaf","Linux >= 8dd91e8d31febf4d9cca3ae1bb4771d33ae7ee5a < 1e4795766719ffd74b8cf0f2fde4a1350f8326bf","Linux >= 8dd91e8d31febf4d9cca3ae1bb4771d33ae7ee5a < a6d89032e5c6620d5bb44582a72555ce07bf1c2e","Linux >= 8dd91e8d31febf4d9cca3ae1bb4771d33ae7ee5a < 650d370cfbc66a96dd14d517bd704689b5bda4e5","Linux 967faa26f313a62e7bebc55d5b8122eaee43b929","Linux >= 6.11.6 < 6.12","Linux 6.12"],"published":"2026-09-11","updated":"2026-10-19","sourceUpdated":"2026-10-19T08:51:16.319Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89703","references":[{"url":"https://git.kernel.org/stable/c/d832a0587528853d45481d1faf75d4b5d062adaf"},{"url":"https://git.kernel.org/stable/c/1e4795766719ffd74b8cf0f2fde4a1350f8326bf"},{"url":"https://git.kernel.org/stable/c/a6d89032e5c6620d5bb44582a72555ce07bf1c2e"},{"url":"https://git.kernel.org/stable/c/650d370cfbc66a96dd14d517bd704689b5bda4e5"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89703.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89703"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532470"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89703"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89703"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89703.mbox"}],"tags":["cve.org","csaf","vex","red-hat","score-dispute"],"epss":0.00617,"epssPercentile":0.49346,"scores":{"cna":9.8,"vendor":7},"ingestedAt":"2026-09-14T15:23:07.472Z","slug":"CVE-2026-89703","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: set SC_STATUS_FREED in nfsd4_drop_revoked_stid for delegations\n\nnfsd4_drop_revoked_stid() handles FREE_STATEID for admin-revoked\ndelegations but does not set SC_STATUS_FREED before releasing cl_lock.\nrevoke_delegation() uses this flag to detect whether FREE_STATEID has\nalready processed the delegation -- without it, the freed delegation is\nadded to cl_revoked via list_add(), producing a use-after-free when\ncl_revoked is later traversed in __destroy_client().\n\nThe SC_STATUS_REVOKED path in nfsd4_free_stateid() (line 7983) already\nsets SC_STATUS_FREED correctly. Apply the same pattern to the\nSC_STATUS_ADMIN_REVOKED path in nfsd4_drop_revoked_stid().\n\n## Affected\n\n- `Linux >= 8dd91e8d31febf4d9cca3ae1bb4771d33ae7ee5a < d832a0587528853d45481d1faf75d4b5d062adaf`\n- `Linux >= 8dd91e8d31febf4d9cca3ae1bb4771d33ae7ee5a < 1e4795766719ffd74b8cf0f2fde4a1350f8326bf`\n- `Linux >= 8dd91e8d31febf4d9cca3ae1bb4771d33ae7ee5a < a6d89032e5c6620d5bb44582a72555ce07bf1c2e`\n- `Linux >= 8dd91e8d31febf4d9cca3ae1bb4771d33ae7ee5a < 650d370cfbc66a96dd14d517bd704689b5bda4e5`\n- `Linux 967faa26f313a62e7bebc55d5b8122eaee43b929`\n- `Linux >= 6.11.6 < 6.12`\n- `Linux 6.12`\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** · 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 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89703.json)","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":224605,"id":"CVE-2026-89703","ts":1792401433627,"field":"cvss","old":"7","new":"9.8"},{"seq":224604,"id":"CVE-2026-89703","ts":1792401433627,"field":"severity","old":"high","new":"critical"},{"seq":203854,"id":"CVE-2026-89703","ts":1789490210178,"field":"cvss","old":"4.4","new":"7"},{"seq":203853,"id":"CVE-2026-89703","ts":1789490210178,"field":"severity","old":"medium","new":"high"},{"seq":202974,"id":"CVE-2026-89703","ts":1789403733179,"field":"cvss","old":"9.8","new":"4.4"},{"seq":202973,"id":"CVE-2026-89703","ts":1789403733179,"field":"severity","old":"critical","new":"medium"},{"seq":197722,"id":"CVE-2026-89703","ts":1789384318549,"field":"cvss","old":"4.4","new":"9.8"},{"seq":197721,"id":"CVE-2026-89703","ts":1789384318549,"field":"severity","old":"medium","new":"critical"},{"seq":183667,"id":"CVE-2026-89703","ts":1789356676854,"field":"cvss","old":"9.8","new":"4.4"},{"seq":183666,"id":"CVE-2026-89703","ts":1789356676854,"field":"severity","old":"critical","new":"medium"},{"seq":153586,"id":"CVE-2026-89703","ts":1789285351387,"field":"cvss","old":null,"new":"9.8"},{"seq":153585,"id":"CVE-2026-89703","ts":1789285351387,"field":"severity","old":"none","new":"critical"},{"seq":147183,"id":"CVE-2026-89703","ts":1789270199551,"field":"cvss","old":null,"new":"4.4"},{"seq":147182,"id":"CVE-2026-89703","ts":1789270199551,"field":"severity","old":"none","new":"medium"},{"seq":108938,"id":"CVE-2026-89703","ts":1789183729628,"field":"cvss","old":null,"new":"4.4"},{"seq":108937,"id":"CVE-2026-89703","ts":1789183729628,"field":"severity","old":"none","new":"medium"}]}