CVE-2026-89669nfsd: initialize copy-notify stateid before publishing it
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: nfsd: initialize copy-notify stateid before publishing it nfsd4_copy_notify() finished initializing the cpntf state after nfs4_alloc_init_cpntf_state() had already linked it into the s2s_cp_stateids IDR and the parent's sc_cp_list, with cs_count == 1 (the membership reference) and none held for the caller. A racing OFFLOAD_CANCEL (crafted cl_id == nn->s2s_cp_cl_id plus the guessable so_id) could reach manage_cpntf_state() and free the entry, turning the caller's subsequent cpn_cnr_stateid read and cp_p_stateid/cp_p_clid writes into use-after-free. The owning clientid was also only recorded after publication, so it could not gate an ownership check in that window. Record cp_p_stateid and cp_p_clid inside nfs4_alloc_init_cpntf_state() before nfs4_init_cp_state() publishes the entry, and return it with an extra reference. The caller reads the stateid under that reference and drops it with nfs4_put_cpntf_state(); on a late error the laundromat reaps the entry.
- CVSS
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Sep 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 624322f1adc58acd0b69f77a6ddc764207e97241 builds before 863b6e995665472f2af5be2436a874ab6a9e5ac6; from 624322f1adc58acd0b69f77a6ddc764207e97241 before d18d36395d973ef7372c8e6724970585f75b5c0b; 624322f1adc58acd0b69f77a6ddc764207e97241 builds before 4415a692346a39fdb647cbd717eda510159aaf55; 624322f1adc58acd0b69f77a6ddc764207e97241 builds before 9caad13b7cfe9ccb90cc405ac77335800e086595; from 624322f1adc58acd0b69f77a6ddc764207e97241 before e08a3dcaca0505f861e344a387f37f94d95dbdc2; from 624322f1adc58acd0b69f77a6ddc764207e97241 before a4d7fedcaaf33e60a01e53eafca9041ef966212f; 624322f1adc58acd0b69f77a6ddc764207e97241 builds before 4cdef96892f4fa6e70c405b6e8f2fd6972f3b64b; from 624322f1adc58acd0b69f77a6ddc764207e97241 before 129643893b79f8a3c6b72045f933fbab5ee424ca | CNA record |
References
- https://git.kernel.org/stable/c/863b6e995665472f2af5be2436a874ab6a9e5ac6
- https://git.kernel.org/stable/c/d18d36395d973ef7372c8e6724970585f75b5c0b
- https://git.kernel.org/stable/c/4415a692346a39fdb647cbd717eda510159aaf55
- https://git.kernel.org/stable/c/9caad13b7cfe9ccb90cc405ac77335800e086595
- https://git.kernel.org/stable/c/e08a3dcaca0505f861e344a387f37f94d95dbdc2
- https://git.kernel.org/stable/c/a4d7fedcaaf33e60a01e53eafca9041ef966212f
- https://git.kernel.org/stable/c/4cdef96892f4fa6e70c405b6e8f2fd6972f3b64b
- https://git.kernel.org/stable/c/129643893b79f8a3c6b72045f933fbab5ee424ca
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.