{"id":"CVE-2026-89676","summary":"nfsd: fix stale s2s_cp_stateids IDR entry for async COPY","details":"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 IDR was pointed at\n&u-\u003ecopy-\u003ecp_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-\u003ecb_stateid is unchanged.","modified":"2026-09-13T03:47:20.187616405Z","published":"2026-09-11T19:46:00.382Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89676.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/14b978e8d05ce018d0afbeb6611833ef91713a02"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9b4e5e9ba5ae13808b8a6d229d87c54611ba0e7a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d0beaee498e11880e72826026db0e9c9890fc114"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89676.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89676"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"e0639dc5805a9d4faaa2c07ad98fa853b9529dd3"},{"fixed":"9b4e5e9ba5ae13808b8a6d229d87c54611ba0e7a"},{"fixed":"14b978e8d05ce018d0afbeb6611833ef91713a02"},{"fixed":"d0beaee498e11880e72826026db0e9c9890fc114"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89676.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.20.0"},{"fixed":"6.18.50"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89676.json"}}],"schema_version":"1.9.0"}