linux-cve-announce - CVE-2025-22039: ksmbd: fix overflow in dacloffset bounds check

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Message-ID: <2025041659-CVE-2025-22039-2a63@gregkh>
Date: Wed, 16 Apr 2025 16:12:10 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2025-22039: ksmbd: fix overflow in dacloffset bounds check

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

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

ksmbd: fix overflow in dacloffset bounds check

The dacloffset field was originally typed as int and used in an
unchecked addition, which could overflow and bypass the existing
bounds check in both smb_check_perm_dacl() and smb_inherit_dacl().

This could result in out-of-bounds memory access and a kernel crash
when dereferencing the DACL pointer.

This patch converts dacloffset to unsigned int and uses
check_add_overflow() to validate access to the DACL.

The Linux kernel CVE team has assigned CVE-2025-22039 to this issue.


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

	Fixed in 6.12.23 with commit 6a9cd9ff0fa2bcc30b2bfb8bdb161eb20e44b9dc
	Fixed in 6.13.11 with commit 6b8d379048b168a0dff5ab1acb975b933f368514
	Fixed in 6.14.2 with commit 443b373a4df5a2cb9f7b8c4658b2afedeb16397f
	Fixed in 6.15-rc1 with commit beff0bc9d69bc8e733f9bca28e2d3df5b3e10e42

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-2025-22039
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/smbacl.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/6a9cd9ff0fa2bcc30b2bfb8bdb161eb20e44b9dc
	https://git.kernel.org/stable/c/6b8d379048b168a0dff5ab1acb975b933f368514
	https://git.kernel.org/stable/c/443b373a4df5a2cb9f7b8c4658b2afedeb16397f
	https://git.kernel.org/stable/c/beff0bc9d69bc8e733f9bca28e2d3df5b3e10e42