linux-cve-announce - CVE-2025-39733: team: replace team lock with rtnl lock

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Message-ID: <2025090730-CVE-2025-39733-0de4@gregkh>
Date: Sun,  7 Sep 2025 17:16:34 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-39733: team: replace team lock with rtnl lock

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

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

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

team: replace team lock with rtnl lock

syszbot reports various ordering issues for lower instance locks and
team lock. Switch to using rtnl lock for protecting team device,
similar to bonding. Based on the patch by Tetsuo Handa.

The Linux kernel CVE team has assigned CVE-2025-39733 to this issue.


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

	Issue introduced in 6.15 with commit 6b1d3c5f675cc794a015138b115afff172fb4c58 and fixed in 6.15.10 with commit 556a4337ba3e9a70e1e3a428e8465c3ea3c4aa41
	Issue introduced in 6.15 with commit 6b1d3c5f675cc794a015138b115afff172fb4c58 and fixed in 6.16.1 with commit 53edc761c9911f597b6d701e846f6e84f15eaa6d
	Issue introduced in 6.15 with commit 6b1d3c5f675cc794a015138b115afff172fb4c58 and fixed in 6.17-rc1 with commit bfb4fb77f9a8ce33ce357224569eae5564eec573

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-2025-39733
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/net/team/team_core.c
	drivers/net/team/team_mode_activebackup.c
	drivers/net/team/team_mode_loadbalance.c
	include/linux/if_team.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/556a4337ba3e9a70e1e3a428e8465c3ea3c4aa41
	https://git.kernel.org/stable/c/53edc761c9911f597b6d701e846f6e84f15eaa6d
	https://git.kernel.org/stable/c/bfb4fb77f9a8ce33ce357224569eae5564eec573