linux-cve-announce - CVE-2026-23228: smb: server: fix leak of active_num_conn in ksmbd_tcp_new

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <2026021807-CVE-2026-23228-647c@gregkh>
Date: Wed, 18 Feb 2026 15:54:17 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2026-23228: smb: server: fix leak of active_num_conn in ksmbd_tcp_new_connection()

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

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

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

smb: server: fix leak of active_num_conn in ksmbd_tcp_new_connection()

On kthread_run() failure in ksmbd_tcp_new_connection(), the transport is
freed via free_transport(), which does not decrement active_num_conn,
leaking this counter.

Replace free_transport() with ksmbd_tcp_disconnect().

The Linux kernel CVE team has assigned CVE-2026-23228 to this issue.


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

	Fixed in 6.6.125 with commit 787769c8cc50416af7b8b1a36e6bcd6aaa7680aa
	Fixed in 6.12.72 with commit baf664fc90a6139a39a58333e4aaa390c10d45dc
	Fixed in 6.18.11 with commit cd25e0d809531a67e9dd53b19012d27d2b13425f
	Fixed in 6.19.1 with commit 599271110c35f6b16e2e4e45b9fbd47ed378c982

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-2026-23228
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_tcp.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/787769c8cc50416af7b8b1a36e6bcd6aaa7680aa
	https://git.kernel.org/stable/c/baf664fc90a6139a39a58333e4aaa390c10d45dc
	https://git.kernel.org/stable/c/cd25e0d809531a67e9dd53b19012d27d2b13425f
	https://git.kernel.org/stable/c/599271110c35f6b16e2e4e45b9fbd47ed378c982
	https://git.kernel.org/stable/c/77ffbcac4e569566d0092d5f22627dfc0896b553