linux-cve-announce - CVE-2025-21944: ksmbd: fix bug on trap in smb2

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Message-ID: <2025040135-CVE-2025-21944-d6eb@gregkh>
Date: Tue,  1 Apr 2025 16:40:08 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2025-21944: ksmbd: fix bug on trap in smb2_lock

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

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

ksmbd: fix bug on trap in smb2_lock

If lock count is greater than 1, flags could be old value.
It should be checked with flags of smb_lock, not flags.
It will cause bug-on trap from locks_free_lock in error handling
routine.

The Linux kernel CVE team has assigned CVE-2025-21944 to this issue.


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

	Fixed in 6.1.131 with commit 11e0e74e14f1832a95092f2c98ed3b99f57797ee
	Fixed in 6.6.83 with commit 8994f0ce8259f812b4f4a681d8298c6ff682efaa
	Fixed in 6.12.19 with commit dbcd7fdd86f77529210fe8978154a81cd479844c
	Fixed in 6.13.7 with commit 2b70e3ac79eacbdf32571f7af48dd81cdd957ca8
	Fixed in 6.14 with commit e26e2d2e15daf1ab33e0135caf2304a0cfa2744b

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-2025-21944
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/11e0e74e14f1832a95092f2c98ed3b99f57797ee
	https://git.kernel.org/stable/c/8994f0ce8259f812b4f4a681d8298c6ff682efaa
	https://git.kernel.org/stable/c/dbcd7fdd86f77529210fe8978154a81cd479844c
	https://git.kernel.org/stable/c/2b70e3ac79eacbdf32571f7af48dd81cdd957ca8
	https://git.kernel.org/stable/c/e26e2d2e15daf1ab33e0135caf2304a0cfa2744b