linux-cve-announce - CVE-2025-39929: smb: client: fix smbdirect_recv_io leak in smbd

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Message-ID: <2025100414-CVE-2025-39929-4308@gregkh>
Date: Sat,  4 Oct 2025 09:33:14 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-39929: smb: client: fix smbdirect_recv_io leak in smbd_negotiate() error path

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

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

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

smb: client: fix smbdirect_recv_io leak in smbd_negotiate() error path

During tests of another unrelated patch I was able to trigger this
error: Objects remaining on __kmem_cache_shutdown()

The Linux kernel CVE team has assigned CVE-2025-39929 to this issue.


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

	Issue introduced in 4.16 with commit f198186aa9bbd60fae7a2061f4feec614d880299 and fixed in 6.1.154 with commit 3d7c075c878ac844e33c43e506c2fa27ac7e9689
	Issue introduced in 4.16 with commit f198186aa9bbd60fae7a2061f4feec614d880299 and fixed in 6.6.108 with commit e7b7a93879558e77d950f1ff9a6f3daa385b33df
	Issue introduced in 4.16 with commit f198186aa9bbd60fae7a2061f4feec614d880299 and fixed in 6.12.49 with commit 922338efaad63cfe30d459dfc59f9d69ff93ded4
	Issue introduced in 4.16 with commit f198186aa9bbd60fae7a2061f4feec614d880299 and fixed in 6.16.9 with commit 0991418bf98f191d0c320bd25245fcffa1998c7e
	Issue introduced in 4.16 with commit f198186aa9bbd60fae7a2061f4feec614d880299 and fixed in 6.17 with commit daac51c7032036a0ca5f1aa419ad1b0471d1c6e0

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-2025-39929
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/smbdirect.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/3d7c075c878ac844e33c43e506c2fa27ac7e9689
	https://git.kernel.org/stable/c/e7b7a93879558e77d950f1ff9a6f3daa385b33df
	https://git.kernel.org/stable/c/922338efaad63cfe30d459dfc59f9d69ff93ded4
	https://git.kernel.org/stable/c/0991418bf98f191d0c320bd25245fcffa1998c7e
	https://git.kernel.org/stable/c/daac51c7032036a0ca5f1aa419ad1b0471d1c6e0