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Message-ID: <2025121632-CVE-2025-68218-4aee@gregkh>
Date: Tue, 16 Dec 2025 14:57:37 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-68218: nvme-multipath: fix lockdep WARN due to partition scan work

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

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

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

nvme-multipath: fix lockdep WARN due to partition scan work

Blktests test cases nvme/014, 057 and 058 fail occasionally due to a
lockdep WARN. As reported in the Closes tag URL, the WARN indicates that
a deadlock can happen due to the dependency among disk->open_mutex,
kblockd workqueue completion and partition_scan_work completion.

To avoid the lockdep WARN and the potential deadlock, cut the dependency
by running the partition_scan_work not by kblockd workqueue but by
nvme_wq.

The Linux kernel CVE team has assigned CVE-2025-68218 to this issue.


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

	Issue introduced in 6.1.118 with commit 60de2e03f984cfbcdc12fa552f95087c35a05a98 and fixed in 6.1.159 with commit 89456dab7ba5ab63d60945440926673a3205e829
	Issue introduced in 6.6.62 with commit 4a57f42e5ed42cb8f1beb262c4f6d3e698939e4e and fixed in 6.6.118 with commit e2a897ad5f538d314955c747a0a2edb184fcdecd
	Issue introduced in 6.12 with commit 1f021341eef41e77a633186e9be5223de2ce5d48 and fixed in 6.12.60 with commit ef4ab2a8abe554379e10303ae86f7c501336ba0d
	Issue introduced in 6.12 with commit 1f021341eef41e77a633186e9be5223de2ce5d48 and fixed in 6.17.10 with commit b03eb63288a8ffe3adfb34e68309c8e2edb06d0b
	Issue introduced in 6.12 with commit 1f021341eef41e77a633186e9be5223de2ce5d48 and fixed in 6.18 with commit 6d87cd5335784351280f82c47cc8a657271929c3
	Issue introduced in 6.11.9 with commit a91b7eddf45afeeb9c5ece11dddff5de0921b00f

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-2025-68218
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:
	drivers/nvme/host/multipath.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/89456dab7ba5ab63d60945440926673a3205e829
	https://git.kernel.org/stable/c/e2a897ad5f538d314955c747a0a2edb184fcdecd
	https://git.kernel.org/stable/c/ef4ab2a8abe554379e10303ae86f7c501336ba0d
	https://git.kernel.org/stable/c/b03eb63288a8ffe3adfb34e68309c8e2edb06d0b
	https://git.kernel.org/stable/c/6d87cd5335784351280f82c47cc8a657271929c3

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