linux-cve-announce - CVE-2025-21748: ksmbd: fix integer overflows on 32 bit systems

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Message-ID: <2025022601-CVE-2025-21748-c980@gregkh>
Date: Wed, 26 Feb 2025 18:11:30 -0800
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2025-21748: ksmbd: fix integer overflows on 32 bit systems

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

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

ksmbd: fix integer overflows on 32 bit systems

On 32bit systems the addition operations in ipc_msg_alloc() can
potentially overflow leading to memory corruption.
Add bounds checking using KSMBD_IPC_MAX_PAYLOAD to avoid overflow.

The Linux kernel CVE team has assigned CVE-2025-21748 to this issue.


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

	Issue introduced in 5.15 with commit 0626e6641f6b467447c81dd7678a69c66f7746cf and fixed in 6.1.129 with commit 760568c1f62ea874e8fb492f9cfa4f47b4b8391e
	Issue introduced in 5.15 with commit 0626e6641f6b467447c81dd7678a69c66f7746cf and fixed in 6.6.78 with commit 82f59d64e6297f270311b16b5dcf65be406d1ea3
	Issue introduced in 5.15 with commit 0626e6641f6b467447c81dd7678a69c66f7746cf and fixed in 6.12.14 with commit b4b902737746c490258de5cb55cab39e79927a67
	Issue introduced in 5.15 with commit 0626e6641f6b467447c81dd7678a69c66f7746cf and fixed in 6.13.3 with commit ecb9947fa7c99a77b04d43404c6988a0d326e4a0
	Issue introduced in 5.15 with commit 0626e6641f6b467447c81dd7678a69c66f7746cf and fixed in 6.14-rc1 with commit aab98e2dbd648510f8f51b83fbf4721206ccae45

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-2025-21748
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/transport_ipc.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/760568c1f62ea874e8fb492f9cfa4f47b4b8391e
	https://git.kernel.org/stable/c/82f59d64e6297f270311b16b5dcf65be406d1ea3
	https://git.kernel.org/stable/c/b4b902737746c490258de5cb55cab39e79927a67
	https://git.kernel.org/stable/c/ecb9947fa7c99a77b04d43404c6988a0d326e4a0
	https://git.kernel.org/stable/c/aab98e2dbd648510f8f51b83fbf4721206ccae45