CVE-2026-89684nfsd: fix cpntf publish race in nfs4_init_cp_state
- 7.5HighCVSS base score
- 0.50%Exploitation in 30 daysEPSS · top 56% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: nfsd: fix cpntf publish race in nfs4_init_cp_state nfs4_alloc_init_cpntf_state() published the new cpntf entry into the s2s_cp_stateids IDR (with cs_type set) in one s2s_cp_lock section, then took the lock again to list_add() it onto p_stid->sc_cp_list. In the gap the entry is reachable by so_id but cp_list is still {NULL,NULL} from kzalloc. A racing OFFLOAD_CANCEL (so_id is echoed to the client as cnr_stateid, so any NFSv4.2 client can drive it) reaches manage_cpntf_state() -> _free_cpntf_state_locked() and does list_del() on the zeroed list_head, oopsing the server. Fold the cs_type assignment and the list_add() into the same critical section as idr_alloc_cyclic(), so a concurrent lookup either misses the entry or sees a fully linked cp_list. INIT_LIST_HEAD() the entry after allocation and switch _free_cpntf_state_locked() to list_del_init() so a stale unlink is a no-op. nfs4_init_copy_state() passes NULL p_stid and skips the list_add, preserving NFS4_COPY_STID semantics.
Timeline
ID reserved
By Linux
Published
- 38 days later
· 38 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Received | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.50% · top 56% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Affected products
- affected 624322f1adc58acd0b69f77a6ddc764207e97241 – < 63e18fc65587fd3f7b4c6d70e96d32fc41d82ba3
- affected 624322f1adc58acd0b69f77a6ddc764207e97241 – < 6ac469a274e3c7d87fc46ba46d83b95009680407
- affected 624322f1adc58acd0b69f77a6ddc764207e97241 – < 8eeca993357a0bc35aaefebfd7462ac7b0a21d9a
- affected 624322f1adc58acd0b69f77a6ddc764207e97241 – < bfeac42d9074e539bacd1898dd8c14b7f5776620
- affected 624322f1adc58acd0b69f77a6ddc764207e97241 – < 21d6c5957f5ca97d7352e60f55ea412beb9419f5
- affected 624322f1adc58acd0b69f77a6ddc764207e97241 – < a631a26a8777bb235eabd478bbbaf26a4db750bf
- affected 624322f1adc58acd0b69f77a6ddc764207e97241 – < c7270f62e7a05a2ee68aa2b74262b658a14463bd
- affected 624322f1adc58acd0b69f77a6ddc764207e97241 – < be3a5c1d857b0dcbc11796cea603ef25834f75b2
- affected 5.6
- unaffected < 5.6
- unaffected 5.10.270 – ≤ 5.10.*
- unaffected 5.15.221 – ≤ 5.15.*
- unaffected 6.1.188 – ≤ 6.1.*
- unaffected 6.6.157 – ≤ 6.6.*
- unaffected 6.12.109 – ≤ 6.12.*
- unaffected 6.18.50 – ≤ 6.18.*
- unaffected 7.2.4 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References8
- https://git.kernel.org/stable/c/63e18fc65587fd3f7b4c6d70e96d32fc41d82ba3 (opens in a new tab)
- https://git.kernel.org/stable/c/6ac469a274e3c7d87fc46ba46d83b95009680407 (opens in a new tab)
- https://git.kernel.org/stable/c/8eeca993357a0bc35aaefebfd7462ac7b0a21d9a (opens in a new tab)
- https://git.kernel.org/stable/c/bfeac42d9074e539bacd1898dd8c14b7f5776620 (opens in a new tab)
- https://git.kernel.org/stable/c/21d6c5957f5ca97d7352e60f55ea412beb9419f5 (opens in a new tab)
- https://git.kernel.org/stable/c/a631a26a8777bb235eabd478bbbaf26a4db750bf (opens in a new tab)
- https://git.kernel.org/stable/c/c7270f62e7a05a2ee68aa2b74262b658a14463bd (opens in a new tab)
- https://git.kernel.org/stable/c/be3a5c1d857b0dcbc11796cea603ef25834f75b2 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-76596 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://cveledger.app/cve/CVE-2026-89684)Record last updated .