linux-cve-announce - CVE-2025-39912: nfs/localio: restore creds before releasing pageio data

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Message-ID: <2025100110-CVE-2025-39912-13cf@gregkh>
Date: Wed,  1 Oct 2025 09:47:17 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-39912: nfs/localio: restore creds before releasing pageio data

From: Greg Kroah-Hartman <gregkh@...nel.org>

Description
===========

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.

The Linux kernel CVE team has assigned CVE-2025-39912 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 6.12 with commit b9f5dd57f4a52990963eeb1f1b58d00f717ece69 and fixed in 6.12.48 with commit 57c1bb02b4fc8eec6eb01736e7fad26dffacf18c
	Issue introduced in 6.12 with commit b9f5dd57f4a52990963eeb1f1b58d00f717ece69 and fixed in 6.16.8 with commit c250be1d75bf80dc5ab46f0b434b746c1868a1ea
	Issue introduced in 6.12 with commit b9f5dd57f4a52990963eeb1f1b58d00f717ece69 and fixed in 6.17 with commit 992203a1fba51b025c60ec0c8b0d9223343dea95

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2025-39912
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	fs/nfs/localio.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/57c1bb02b4fc8eec6eb01736e7fad26dffacf18c
	https://git.kernel.org/stable/c/c250be1d75bf80dc5ab46f0b434b746c1868a1ea
	https://git.kernel.org/stable/c/992203a1fba51b025c60ec0c8b0d9223343dea95