CVE-2025-38724
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-09-04

Last updated on: 2025-11-03

Assigner: kernel.org

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().
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Meta Information
Published
2025-09-04
Last Modified
2025-11-03
Generated
2026-05-07
AI Q&A
2025-09-04
EPSS Evaluated
2026-05-05
NVD
CVE-2025-38724
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
linux linux_kernel 6.1.153-1
linux linux_kernel 5.10.244-1
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-UNKNOWN
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?

This vulnerability occurs in the Linux kernel's NFS server code, specifically in the function nfsd4_setclientid_confirm(). The function did not properly check the return value from get_client_locked(), which could lead to a race condition where a SETCLIENTID_CONFIRM request races with a confirmed client expiring. This race could cause a failure to get a reference to the client, potentially leading to a use-after-free (UAF) condition. The fix involves obtaining a reference early when there is an existing confirmed client and handling failure cases appropriately to avoid the UAF.


How can this vulnerability impact me? :

This vulnerability can lead to a use-after-free condition in the Linux kernel's NFS server, which may cause system instability, crashes, or potentially allow an attacker to execute arbitrary code or escalate privileges on the affected system.


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