CVE-2026-89662Critical· 9.8▾ MidnightIn the Linux kernel, the following vulnerability has been resolved: NFSD: Prevent lock owner use-after-free during client teardown __destroy_client() releases a client's open owners, but a lock owner whose only reference is a blocked l…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 53.9 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
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%
— → 5.3
none → medium
— → 9.8
none → critical
9.8 → 5.3
critical → medium
5.3 → 9.8
medium → critical
9.8 → 7
critical → high
0.2% → 0.7%
7 → 9.8
high → critical
Last analysed / modified upstream
In the Linux kernel, the following vulnerability has been resolved:
NFSD: Prevent lock owner use-after-free during client teardown
__destroy_client() releases a client's open owners, but a lock owner whose only reference is a blocked lock (nbl) stays on cl_ownerstr_hashtbl. client_has_state() does not count a bare owner, so DESTROY_CLIENTID can reach __destroy_client() with such owners present.
__destroy_client() then walks the table, calling remove_blocked_locks() on each owner without a reference. Freeing a blocked lock drops the owner reference held via flc_owner. The per-net laundromat reaps blocked locks from nn->blocked_locks_lru independently of client state. The two paths share blocked_locks_lock only for the list splice, not the owner's lifetime. The laundromat therefore frees the owner as __destroy_client() dereferences it, a NULL dereference in remove_blocked_locks().
nfsd4_release_lockowner() holds a reference across the same call; __destroy_client() does not. Hold cl_lock across the walk, taking a reference and unhashing each owner, then drop it before remove_blocked_locks() and nfs4_put_stateowner(), which take blocked_locks_lock and cl_lock.
Linux >= 68ef3bc3166468678d5e1fdd216628c35bd1186f < 42d7954b0a1907d4ef122aef94561952a033cdc3Linux >= 68ef3bc3166468678d5e1fdd216628c35bd1186f < bb38ff8b4dafbbd1781ad37cd96722fdf2cd972aLinux >= 68ef3bc3166468678d5e1fdd216628c35bd1186f < b8bad5a11416b26cc7fd4b18fba46d75ff636558Linux >= 68ef3bc3166468678d5e1fdd216628c35bd1186f < 1ce74d1b7770e69735e8f8e509807af4ff9c8ee7Linux >= 68ef3bc3166468678d5e1fdd216628c35bd1186f < a6ead6fff3a7d03e49845f048f7000a2e0d34431Linux >= 68ef3bc3166468678d5e1fdd216628c35bd1186f < 4804c58f73a80d12df1de323bf97a164f6ee8743Linux >= 68ef3bc3166468678d5e1fdd216628c35bd1186f < 8cf4ff0a7c083dd5e0067f517d63979b74b66649Linux >= 68ef3bc3166468678d5e1fdd216628c35bd1186f < 5e2fa29d223a9a1e6a948e40b109d09081d1decdLinux e294c4c2d33b7307a89cdf31bec08a112d6a9297Linux 797bfd05d4040fbf766198b3cfcc1838002cc890Linux 0f44e9da465ea259b6c9f31a627f3c50a16e1679Linux >= 4.9.91 < 4.10Linux >= 4.14.31 < 4.15Linux >= 4.15.14 < 4.16Linux 4.16Refer 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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