CVE-2026-89658Critical· 9.8▾ MidnightIn the Linux kernel, the following vulnerability has been resolved: NFSD: Prevent client use-after-free during NFSv4.0 revoked-state cleanup nfs40_clean_admin_revoked() takes a stateid reference under clp->cl_lock, drops nn->client_loc…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 53.9 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.2%
— → 9.8
none → critical
9.8 → 4.4
critical → medium
4.4 → 9.8
medium → critical
9.8 → 4.4
critical → medium
4.4 → 7
medium → high
0.2% → 0.7%
Last analysed / modified upstream
7 → 9.8
high → critical
In the Linux kernel, the following vulnerability has been resolved:
NFSD: Prevent client use-after-free during NFSv4.0 revoked-state cleanup
nfs40_clean_admin_revoked() takes a stateid reference under clp->cl_lock, drops nn->client_lock, and calls nfsd4_drop_revoked_stid(), which dereferences the stateid's client through s->sc_client->cl_lock. The stateid reference does not pin the client, so a teardown racing the dropped lock can free the client while nfsd4_drop_revoked_stid() is still using it.
This cleanup runs from the laundromat, so a periodic sweep can race force_expire_client() driven by a write to the clients/<id>/ctl file.
Skip a client that is already expiring and otherwise pin it with cl_rpc_users under client_lock before dropping the lock, matching nfsd4_revoke_states().
Linux >= d688d8585e6bea5e4e37f7497feea93b6b0a469c < 0ae0d2b5c5a1b39c0b3c15d96b32a5b0c583d519Linux >= d688d8585e6bea5e4e37f7497feea93b6b0a469c < b413ec5b23e3445dc9c4f273116078e2d4747626Linux >= d688d8585e6bea5e4e37f7497feea93b6b0a469c < 81cf7f1413862f87b078920c838460a6a88aa030Linux >= d688d8585e6bea5e4e37f7497feea93b6b0a469c < 7b4f8a1586c42d3afc3c0ac779af2db7ab1a5c55Linux 6.9Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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