CVE-2026-90037NFSD: Prevent client use-after-free during close_lru reaping
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: Prevent client use-after-free during close_lru reaping An nfs4_openowner left on nn->close_lru after its final CLOSE keeps its last closed stateid in oo_last_closed_stid, holding only a raw pointer to its nfs4_client. The laundromat reaps timed-out entries, drops nn->client_lock, and calls nfs4_put_stid(), which dereferences the client through cl_lock. Nothing pins the client across that window, so a concurrent force_expire_client() can free it and nfs4_put_stid() reads freed memory. __destroy_client() hits the same race, walking clp->cl_openowners without cl_lock. Pin the client with cl_rpc_users before dropping client_lock, and skip clients already expiring. __destroy_client() then cleans up its own close_lru entries through release_last_closed_stateid(), so teardown no longer races the laundromat.
- 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 21, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 217526e7ecc9f6f243e976772e81eab7ab986a4c before 0763482227822f7343557f086afc382086d56c4c; 217526e7ecc9f6f243e976772e81eab7ab986a4c builds before 83dd59ac1c3455c2c7d8ddb582d980a13199b9b3; from 217526e7ecc9f6f243e976772e81eab7ab986a4c before e57a9ed34ea8c17e831de59b8f1a6b2d80d347a1; 217526e7ecc9f6f243e976772e81eab7ab986a4c builds before 2330b788d732f43668b965b3105b37ceb276dfea | CNA record |
References
- https://git.kernel.org/stable/c/0763482227822f7343557f086afc382086d56c4c
- https://git.kernel.org/stable/c/83dd59ac1c3455c2c7d8ddb582d980a13199b9b3
- https://git.kernel.org/stable/c/e57a9ed34ea8c17e831de59b8f1a6b2d80d347a1
- https://git.kernel.org/stable/c/2330b788d732f43668b965b3105b37ceb276dfea
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.