{"id":"CVE-2026-89676","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: fix stale s2s_cp_stateids IDR entry for async COPY\n\nFor an async COPY, nfsd4_copy() called nfs4_init_copy_state() before\ndup_copy_fields(), so the s2s_cp_stateids…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: fix stale s2s_cp_stateids IDR entry for async COPY\n\nFor an async COPY, nfsd4_copy() called nfs4_init_copy_state() before\ndup_copy_fields(), so the s2s_cp_stateids…","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","cwe":["CWE-825"],"vendor":"Linux","product":"Linux","affected":["Linux >= e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 < 7aa34ea78f74e6ef60c8112635a87fc43d57f6c9","Linux >= e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 < 9b4e5e9ba5ae13808b8a6d229d87c54611ba0e7a","Linux >= e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 < 14b978e8d05ce018d0afbeb6611833ef91713a02","Linux >= e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 < d0beaee498e11880e72826026db0e9c9890fc114","Linux 4.20"],"published":"2026-09-11","updated":"2026-09-21","sourceUpdated":"2026-09-21T14:17:25.073","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-89676","references":[{"url":"https://git.kernel.org/stable/c/14b978e8d05ce018d0afbeb6611833ef91713a02","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7aa34ea78f74e6ef60c8112635a87fc43d57f6c9","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9b4e5e9ba5ae13808b8a6d229d87c54611ba0e7a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d0beaee498e11880e72826026db0e9c9890fc114","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89676.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89676"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532219"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89676"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89676"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89676.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat","score-dispute"],"epss":0.00448,"epssPercentile":0.38209,"scores":{"nvd":9.8,"cna":9.8,"vendor":7},"ingestedAt":"2026-09-14T15:23:07.473Z","slug":"CVE-2026-89676","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: fix stale s2s_cp_stateids IDR entry for async COPY\n\nFor an async COPY, nfsd4_copy() called nfs4_init_copy_state() before\ndup_copy_fields(), so the s2s_cp_stateids IDR was pointed at\n&u->copy->cp_stateid -- memory in the per-rqstp COMPOUND buffer that is\nreused by the next request. dup_copy_fields() copies only the value into\nasync_copy, so the IDR slot dangled at the transient buffer for the whole\nbackground copy. Any IDR walker then dereferences reused request memory:\nthe laundromat reads cs_type from it and, if the bytes look like an\nexpired NFS4_COPYNOTIFY_STID, follows into\nrefcount_dec()/idr_remove()/kfree() on garbage; manage_cpntf_state() has\nthe same exposure via idr_find().\n\nDuplicate the fields first, then register the stateid on the stable\nasync_copy. result->cb_stateid is unchanged.\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 Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89676.json)","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":208373,"id":"CVE-2026-89676","ts":1789997912967,"field":"cvss","old":"5.3","new":"9.8"},{"seq":208372,"id":"CVE-2026-89676","ts":1789997912967,"field":"severity","old":"medium","new":"critical"},{"seq":202828,"id":"CVE-2026-89676","ts":1789403732572,"field":"cvss","old":"9.8","new":"5.3"},{"seq":202827,"id":"CVE-2026-89676","ts":1789403732572,"field":"severity","old":"critical","new":"medium"},{"seq":197756,"id":"CVE-2026-89676","ts":1789384318717,"field":"cvss","old":"5.3","new":"9.8"},{"seq":197755,"id":"CVE-2026-89676","ts":1789384318717,"field":"severity","old":"medium","new":"critical"},{"seq":183365,"id":"CVE-2026-89676","ts":1789356675061,"field":"cvss","old":"9.8","new":"5.3"},{"seq":183364,"id":"CVE-2026-89676","ts":1789356675061,"field":"severity","old":"critical","new":"medium"},{"seq":153544,"id":"CVE-2026-89676","ts":1789285351222,"field":"cvss","old":null,"new":"9.8"},{"seq":153543,"id":"CVE-2026-89676","ts":1789285351222,"field":"severity","old":"none","new":"critical"},{"seq":147526,"id":"CVE-2026-89676","ts":1789270211252,"field":"cvss","old":null,"new":"5.3"},{"seq":147525,"id":"CVE-2026-89676","ts":1789270211252,"field":"severity","old":"none","new":"medium"},{"seq":109282,"id":"CVE-2026-89676","ts":1789183731267,"field":"cvss","old":null,"new":"5.3"},{"seq":109281,"id":"CVE-2026-89676","ts":1789183731267,"field":"severity","old":"none","new":"medium"}]}