linux-cve-announce - CVE-2022-50712: devlink: hold region lock when flushing snapshots

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Message-ID: <2025122412-CVE-2022-50712-6c0d@gregkh>
Date: Wed, 24 Dec 2025 13:26:11 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50712: devlink: hold region lock when flushing snapshots

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

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

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

devlink: hold region lock when flushing snapshots

Netdevsim triggers a splat on reload, when it destroys regions
with snapshots pending:

  WARNING: CPU: 1 PID: 787 at net/core/devlink.c:6291 devlink_region_snapshot_del+0x12e/0x140
  CPU: 1 PID: 787 Comm: devlink Not tainted 6.1.0-07460-g7ae9888d6e1c #580
  RIP: 0010:devlink_region_snapshot_del+0x12e/0x140
  Call Trace:
   <TASK>
   devl_region_destroy+0x70/0x140
   nsim_dev_reload_down+0x2f/0x60 [netdevsim]
   devlink_reload+0x1f7/0x360
   devlink_nl_cmd_reload+0x6ce/0x860
   genl_family_rcv_msg_doit.isra.0+0x145/0x1c0

This is the locking assert in devlink_region_snapshot_del(),
we're supposed to be holding the region->snapshot_lock here.

The Linux kernel CVE team has assigned CVE-2022-50712 to this issue.


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

	Issue introduced in 6.0 with commit 2dec18ad826f52658f7781ee995d236cc449b678 and fixed in 6.0.16 with commit 49383d4e59bb704341aaa1d51440ccce58270e61
	Issue introduced in 6.0 with commit 2dec18ad826f52658f7781ee995d236cc449b678 and fixed in 6.1.2 with commit 6298cab4d80bfdb6fe01fe31fd9f0ba26317fdae
	Issue introduced in 6.0 with commit 2dec18ad826f52658f7781ee995d236cc449b678 and fixed in 6.2 with commit b4cafb3d2c740f8d1b1234b43ac4a60e5291c960

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-2022-50712
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:
	net/core/devlink.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/49383d4e59bb704341aaa1d51440ccce58270e61
	https://git.kernel.org/stable/c/6298cab4d80bfdb6fe01fe31fd9f0ba26317fdae
	https://git.kernel.org/stable/c/b4cafb3d2c740f8d1b1234b43ac4a60e5291c960