linux-cve-announce - CVE-2025-38561: ksmbd: fix Preauh

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Message-ID: <2025081907-CVE-2025-38561-0f75@gregkh>
Date: Tue, 19 Aug 2025 19:18:08 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-38561: ksmbd: fix Preauh_HashValue race condition

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

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

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

ksmbd: fix Preauh_HashValue race condition

If client send multiple session setup requests to ksmbd,
Preauh_HashValue race condition could happen.
There is no need to free sess->Preauh_HashValue at session setup phase.
It can be freed together with session at connection termination phase.

The Linux kernel CVE team has assigned CVE-2025-38561 to this issue.


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

	Fixed in 6.1.148 with commit fbf5c0845ed15122a770bca9be1d9b60b470d3aa
	Fixed in 6.6.102 with commit b69fd87076daa66f3d186bd421a7b0ee0cb45829
	Fixed in 6.12.42 with commit edeecc7871e8fc0878d53ce286c75040a0e38f6c
	Fixed in 6.15.10 with commit 7d7c0c5304c88bcbd7a85e9bcd61d27e998ba5fc
	Fixed in 6.16.1 with commit 6613887da1d18dd2ecfd6c6148a873c4d903ebdc
	Fixed in 6.17-rc1 with commit 44a3059c4c8cc635a1fb2afd692d0730ca1ba4b6

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-2025-38561
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/server/smb2pdu.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/fbf5c0845ed15122a770bca9be1d9b60b470d3aa
	https://git.kernel.org/stable/c/b69fd87076daa66f3d186bd421a7b0ee0cb45829
	https://git.kernel.org/stable/c/edeecc7871e8fc0878d53ce286c75040a0e38f6c
	https://git.kernel.org/stable/c/7d7c0c5304c88bcbd7a85e9bcd61d27e998ba5fc
	https://git.kernel.org/stable/c/6613887da1d18dd2ecfd6c6148a873c4d903ebdc
	https://git.kernel.org/stable/c/44a3059c4c8cc635a1fb2afd692d0730ca1ba4b6