CVE-2025-38724
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: nfsd: handle get_client_locked() failure in nfsd4_setclientid_confirm() Lei Lu recently reported that nfsd4_setclientid_confirm() did not check the return value from get_client_locked(). a SETCLIENTID_CONFIRM could race with a confirmed client expiring and fail to get a reference. That could later lead to a UAF. Fix this by getting a reference early in the case where there is an extant confirmed client. If that fails then treat it as if there were no confirmed client found at all. In the case where the unconfirmed client is expiring, just fail and return the result from get_client_locked().
Severity
HIGH
CVSS score
7.8
(v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-09-04 16:15:42.273000
Last modified
2026-10-19 21:10:00.160000
View original CVE JSON
{
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"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-09-04T16:15:42.273",
"lastModified": "2026-10-19T21:10:00.160",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: handle get_client_locked() failure in nfsd4_setclientid_confirm()\n\nLei Lu recently reported that nfsd4_setclientid_confirm() did not check\nthe return value from get_client_locked(). a SETCLIENTID_CONFIRM could\nrace with a confirmed client expiring and fail to get a reference. That\ncould later lead to a UAF.\n\nFix this by getting a reference early in the case where there is an\nextant confirmed client. If that fails then treat it as if there were no\nconfirmed client found at all.\n\nIn the case where the unconfirmed client is expiring, just fail and\nreturn the result from get_client_locked()."
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"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnfsd: manejar el fallo de get_client_locked() en nfsd4_setclientid_confirm()\n\nLei Lu informó recientemente que nfsd4_setclientid_confirm() no comprobaba el valor de retorno de get_client_locked(). Un SETCLIENTID_CONFIRM podría entrar en condición de carrera con un cliente confirmado que expira y fallar al obtener una referencia. Eso podría llevar más tarde a un UAF.\n\nSolucionar esto obteniendo una referencia temprano en el caso donde hay un cliente confirmado existente. Si eso falla, entonces tratarlo como si no se hubiera encontrado ningún cliente confirmado en absoluto.\n\nEn el caso donde el cliente no confirmado está expirando, simplemente fallar y devolver el resultado de get_client_locked()."
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