linux-cve-announce - CVE-2025-38737: cifs: Fix oops due to uninitialised variable

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Message-ID: <2025090544-CVE-2025-38737-4cde@gregkh>
Date: Fri,  5 Sep 2025 19:20:46 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-38737: cifs: Fix oops due to uninitialised variable

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

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

In the Linux kernel, the following vulnerability has been resolved:

cifs: Fix oops due to uninitialised variable

Fix smb3_init_transform_rq() to initialise buffer to NULL before calling
netfs_alloc_folioq_buffer() as netfs assumes it can append to the buffer it
is given.  Setting it to NULL means it should start a fresh buffer, but the
value is currently undefined.

The Linux kernel CVE team has assigned CVE-2025-38737 to this issue.


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

	Issue introduced in 6.12 with commit a2906d3316fc19bf0ade84618bb73eab604c447e and fixed in 6.12.44 with commit 4931fe2dbe1cc0e7d350a4b51b0b330e43971d98
	Issue introduced in 6.12 with commit a2906d3316fc19bf0ade84618bb73eab604c447e and fixed in 6.16.4 with commit 6adaa9fae36f848afa7278945d725e197e33c496
	Issue introduced in 6.12 with commit a2906d3316fc19bf0ade84618bb73eab604c447e and fixed in 6.17-rc3 with commit 453a6d2a68e54a483d67233c6e1e24c4095ee4be

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-2025-38737
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/smb/client/smb2ops.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/4931fe2dbe1cc0e7d350a4b51b0b330e43971d98
	https://git.kernel.org/stable/c/6adaa9fae36f848afa7278945d725e197e33c496
	https://git.kernel.org/stable/c/453a6d2a68e54a483d67233c6e1e24c4095ee4be