linux-cve-announce - CVE-2025-38460: atm: clip: Fix potential null-ptr-deref in to

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <2025072507-CVE-2025-38460-40fb@gregkh>
Date: Fri, 25 Jul 2025 17:28:22 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-38460: atm: clip: Fix potential null-ptr-deref in to_atmarpd().

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

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

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

atm: clip: Fix potential null-ptr-deref in to_atmarpd().

atmarpd is protected by RTNL since commit f3a0592b37b8 ("[ATM]: clip
causes unregister hang").

However, it is not enough because to_atmarpd() is called without RTNL,
especially clip_neigh_solicit() / neigh_ops->solicit() is unsleepable.

Also, there is no RTNL dependency around atmarpd.

Let's use a private mutex and RCU to protect access to atmarpd in
to_atmarpd().

The Linux kernel CVE team has assigned CVE-2025-38460 to this issue.


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

	Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 5.4.296 with commit a4c5785feb979cd996a99cfaad8bf353b2e79301
	Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 5.10.240 with commit 70eac9ba7ce25d99c1d99bbf4ddb058940f631f9
	Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 5.15.189 with commit 3251ce3979f41bd228f77a7615f9dd616d06a110
	Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.1.146 with commit ee4d9e4ddf3f9c4ee2ec0a3aad6196ee36d30e57
	Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.6.99 with commit 06935c50cfa3ac57cce80bba67b6d38ec1406e92
	Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.12.39 with commit 36caab990b69ef4eec1d81c52a19f080b7daa059
	Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.15.7 with commit f58e4270c73e7f086322978d585ea67c8076ce49
	Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.16-rc6 with commit 706cc36477139c1616a9b2b96610a8bb520b7119

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-2025-38460
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/atm/clip.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/a4c5785feb979cd996a99cfaad8bf353b2e79301
	https://git.kernel.org/stable/c/70eac9ba7ce25d99c1d99bbf4ddb058940f631f9
	https://git.kernel.org/stable/c/3251ce3979f41bd228f77a7615f9dd616d06a110
	https://git.kernel.org/stable/c/ee4d9e4ddf3f9c4ee2ec0a3aad6196ee36d30e57
	https://git.kernel.org/stable/c/06935c50cfa3ac57cce80bba67b6d38ec1406e92
	https://git.kernel.org/stable/c/36caab990b69ef4eec1d81c52a19f080b7daa059
	https://git.kernel.org/stable/c/f58e4270c73e7f086322978d585ea67c8076ce49
	https://git.kernel.org/stable/c/706cc36477139c1616a9b2b96610a8bb520b7119