linux-cve-announce - CVE-2025-39720: ksmbd: fix refcount leak causing resource not released

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Message-ID: <2025090551-CVE-2025-39720-3cbf@gregkh>
Date: Fri,  5 Sep 2025 19:21:33 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-39720: ksmbd: fix refcount leak causing resource not released

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

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

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

ksmbd: fix refcount leak causing resource not released

When ksmbd_conn_releasing(opinfo->conn) returns true,the refcount was not
decremented properly, causing a refcount leak that prevents the count from
reaching zero and the memory from being released.

The Linux kernel CVE team has assigned CVE-2025-39720 to this issue.


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

	Fixed in 6.6.103 with commit a1d2bab4d53368a526c97aba92671dd71814f95a
	Fixed in 6.12.44 with commit 36e010bb865fbaa1202fe9bcce3fd486d6db7606
	Fixed in 6.16.4 with commit 9a7abce6e8c0e2145b346a6d4abf0d9655e9b0e8
	Fixed in 6.17-rc3 with commit 89bb430f621124af39bb31763c4a8b504c9651e2

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-2025-39720
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/oplock.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/a1d2bab4d53368a526c97aba92671dd71814f95a
	https://git.kernel.org/stable/c/36e010bb865fbaa1202fe9bcce3fd486d6db7606
	https://git.kernel.org/stable/c/9a7abce6e8c0e2145b346a6d4abf0d9655e9b0e8
	https://git.kernel.org/stable/c/89bb430f621124af39bb31763c4a8b504c9651e2