linux-cve-announce - CVE-2025-37776: ksmbd: fix use-after-free in smb_break_all_levII

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Message-ID: <2025050115-CVE-2025-37776-9bfb@gregkh>
Date: Thu,  1 May 2025 15:07:24 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-37776: ksmbd: fix use-after-free in smb_break_all_levII_oplock()

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

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

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

ksmbd: fix use-after-free in smb_break_all_levII_oplock()

There is a room in smb_break_all_levII_oplock that can cause racy issues
when unlocking in the middle of the loop. This patch use read lock
to protect whole loop.

The Linux kernel CVE team has assigned CVE-2025-37776 to this issue.


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

	Fixed in 6.6.88 with commit 296cb5457cc6f4a754c4ae29855f8a253d52bcc6
	Fixed in 6.12.25 with commit d54ab1520d43e95f9b2e22d7a05fc9614192e5a5
	Fixed in 6.14.4 with commit d73686367ad68534257cd88a36ca3c52cb8b81d8
	Fixed in 6.15-rc3 with commit 18b4fac5ef17f77fed9417d22210ceafd6525fc7

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-2025-37776
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
	fs/smb/server/oplock.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/296cb5457cc6f4a754c4ae29855f8a253d52bcc6
	https://git.kernel.org/stable/c/d54ab1520d43e95f9b2e22d7a05fc9614192e5a5
	https://git.kernel.org/stable/c/d73686367ad68534257cd88a36ca3c52cb8b81d8
	https://git.kernel.org/stable/c/18b4fac5ef17f77fed9417d22210ceafd6525fc7