{"id":"CVE-2026-90037","published":"2026-09-16T11:17:16.910","lastModified":"2026-09-21T14:17:27.983","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nNFSD: Prevent client use-after-free during close_lru reaping\n\nAn nfs4_openowner left on nn->close_lru after its final CLOSE keeps\nits last closed stateid in oo_last_closed_stid, holding only a raw\npointer to its nfs4_client. The laundromat reaps timed-out entries,\ndrops nn->client_lock, and calls nfs4_put_stid(), which dereferences\nthe client through cl_lock. Nothing pins the client across that\nwindow, so a concurrent force_expire_client() can free it and\nnfs4_put_stid() reads freed memory. __destroy_client() hits the same\nrace, walking clp->cl_openowners without cl_lock.\n\nPin the client with cl_rpc_users before dropping client_lock, and\nskip clients already expiring. __destroy_client() then cleans up its\nown close_lru entries through release_last_closed_stateid(), so\nteardown no longer races the laundromat.","cvssScore":9.8,"cvssSeverity":"CRITICAL","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/0763482227822f7343557f086afc382086d56c4c","tags":[]},{"url":"https://git.kernel.org/stable/c/2330b788d732f43668b965b3105b37ceb276dfea","tags":[]},{"url":"https://git.kernel.org/stable/c/83dd59ac1c3455c2c7d8ddb582d980a13199b9b3","tags":[]},{"url":"https://git.kernel.org/stable/c/e57a9ed34ea8c17e831de59b8f1a6b2d80d347a1","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":{"summary":"This vulnerability allows an attacker to exploit a use-after-free condition in the Linux kernel's NFSv4 implementation, leading to potential memory corruption and privilege escalation.","exploitability":"Exploitation requires concurrent access to the NFSv4 server and the ability to trigger the race condition, making it moderately difficult.","blast_radius":"If exploited, the attacker could gain control over the server, leading to severe system compromise.","remediation":"Upgrade to the specific version 6.2-rc1 or later.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["kernel","nfs","use-after-free","memory-corruption"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-09-28T08:58:20.700Z"}}