linux-cve-announce - CVE-2024-50285: ksmbd: check outstanding simultaneous SMB operations

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Message-ID: <2024111946-CVE-2024-50285-6013@gregkh>
Date: Tue, 19 Nov 2024 02:32:40 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-50285: ksmbd: check outstanding simultaneous SMB operations

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

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

ksmbd: check outstanding simultaneous SMB operations

If Client send simultaneous SMB operations to ksmbd, It exhausts too much
memory through the "ksmbd_work_cache”. It will cause OOM issue.
ksmbd has a credit mechanism but it can't handle this problem. This patch
add the check if it exceeds max credits to prevent this problem by assuming
that one smb request consumes at least one credit.

The Linux kernel CVE team has assigned CVE-2024-50285 to this issue.


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

	Fixed in 6.6.61 with commit 1f993777275c
	Fixed in 6.11.8 with commit e257ac6fe138
	Fixed in 6.12 with commit 0a77d947f599

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-2024-50285
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/connection.c
	fs/smb/server/connection.h
	fs/smb/server/server.c
	fs/smb/server/smb_common.c
	fs/smb/server/smb_common.h


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/1f993777275cbd8f74765c4f9d9285cb907c9be5
	https://git.kernel.org/stable/c/e257ac6fe138623cf59fca8898abdf659dbc8356
	https://git.kernel.org/stable/c/0a77d947f599b1f39065015bec99390d0c0022ee