linux-cve-announce - CVE-2025-21945: ksmbd: fix use-after-free in smb2

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Message-ID: <2025040136-CVE-2025-21945-d791@gregkh>
Date: Tue,  1 Apr 2025 16:40:09 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2025-21945: ksmbd: fix use-after-free in smb2_lock

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

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

ksmbd: fix use-after-free in smb2_lock

If smb_lock->zero_len has value, ->llist of smb_lock is not delete and
flock is old one. It will cause use-after-free on error handling
routine.

The Linux kernel CVE team has assigned CVE-2025-21945 to this issue.


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

	Fixed in 6.1.131 with commit 410ce35a2ed6d0e114132bba29af49b69880c8c7
	Fixed in 6.6.83 with commit 8573571060ca466cbef2c6f03306b2cc7b883506
	Fixed in 6.12.19 with commit a0609097fd10d618aed4864038393dd75131289e
	Fixed in 6.13.7 with commit 636e021646cf9b52ddfea7c809b018e91f2188cb
	Fixed in 6.14 with commit 84d2d1641b71dec326e8736a749b7ee76a9599fc

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-2025-21945
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/smb2pdu.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/410ce35a2ed6d0e114132bba29af49b69880c8c7
	https://git.kernel.org/stable/c/8573571060ca466cbef2c6f03306b2cc7b883506
	https://git.kernel.org/stable/c/a0609097fd10d618aed4864038393dd75131289e
	https://git.kernel.org/stable/c/636e021646cf9b52ddfea7c809b018e91f2188cb
	https://git.kernel.org/stable/c/84d2d1641b71dec326e8736a749b7ee76a9599fc