Bug 2400591 (CVE-2025-39912)

Summary: CVE-2025-39912 kernel: nfs/localio: restore creds before releasing pageio data
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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Description OSIDB Bzimport 2025-10-01 08:01:14 UTC 
In the Linux kernel, the following vulnerability has been resolved:

nfs/localio: restore creds before releasing pageio data

Otherwise if the nfsd filecache code releases the nfsd_file
immediately, it can trigger the BUG_ON(cred == current->cred) in
__put_cred() when it puts the nfsd_file->nf_file->f-cred.
Comment 1 Alexander B 2025-10-02 10:20:24 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025100110-CVE-2025-39912-13cf@gregkh/T