linux-cve-announce - CVE-2024-50286: ksmbd: fix slab-use-after-free in ksmbd_smb2_session

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Message-ID: <2024111948-CVE-2024-50286-85e9@gregkh>
Date: Tue, 19 Nov 2024 02:32:41 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-50286: ksmbd: fix slab-use-after-free in ksmbd_smb2_session_create

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

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

ksmbd: fix slab-use-after-free in ksmbd_smb2_session_create

There is a race condition between ksmbd_smb2_session_create and
ksmbd_expire_session. This patch add missing sessions_table_lock
while adding/deleting session from global session table.

The Linux kernel CVE team has assigned CVE-2024-50286 to this issue.


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

	Fixed in 6.1.117 with commit f56446ba5378
	Fixed in 6.6.61 with commit e923503a56b3
	Fixed in 6.11.8 with commit e7a2ad204437
	Fixed in 6.12 with commit 0a77715db226

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-2024-50286
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/mgmt/user_session.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/f56446ba5378d19e31040b548a14ee9a8f1500ea
	https://git.kernel.org/stable/c/e923503a56b3385b64ae492e3225e4623f560c5b
	https://git.kernel.org/stable/c/e7a2ad2044377853cf8c59528dac808a08a99c72
	https://git.kernel.org/stable/c/0a77715db22611df50b178374c51e2ba0d58866e