linux-cve-announce - CVE-2025-40149: tls: Use __sk_dst_get() and dst_dev_rcu() in get_netdev_for

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Message-ID: <2025111257-CVE-2025-40149-2c48@gregkh>
Date: Wed, 12 Nov 2025 19:24:25 +0900
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-40149: tls: Use __sk_dst_get() and dst_dev_rcu() in get_netdev_for_sock().

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

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

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

tls: Use __sk_dst_get() and dst_dev_rcu() in get_netdev_for_sock().

get_netdev_for_sock() is called during setsockopt(),
so not under RCU.

Using sk_dst_get(sk)->dev could trigger UAF.

Let's use __sk_dst_get() and dst_dev_rcu().

Note that the only ->ndo_sk_get_lower_dev() user is
bond_sk_get_lower_dev(), which uses RCU.

The Linux kernel CVE team has assigned CVE-2025-40149 to this issue.

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

	Issue introduced in 4.18 with commit e8f69799810c32dd40c6724d829eccc70baad07f and fixed in 6.17.3 with commit feb474ddbf26b51f462ae2e60a12013bdcfc5407
	Issue introduced in 4.18 with commit e8f69799810c32dd40c6724d829eccc70baad07f and fixed in 6.18-rc1 with commit c65f27b9c3be2269918e1cbad6d8884741f835c5

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-2025-40149
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/tls/tls_device.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/feb474ddbf26b51f462ae2e60a12013bdcfc5407
	https://git.kernel.org/stable/c/c65f27b9c3be2269918e1cbad6d8884741f835c5