linux-cve-announce - CVE-2025-38546: atm: clip: Fix memory leak of struct clip

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Message-ID: <2025081627-CVE-2025-38546-f8fa@gregkh>
Date: Sat, 16 Aug 2025 13:22:32 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-38546: atm: clip: Fix memory leak of struct clip_vcc.

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

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

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

atm: clip: Fix memory leak of struct clip_vcc.

ioctl(ATMARP_MKIP) allocates struct clip_vcc and set it to
vcc->user_back.

The code assumes that vcc_destroy_socket() passes NULL skb
to vcc->push() when the socket is close()d, and then clip_push()
frees clip_vcc.

However, ioctl(ATMARPD_CTRL) sets NULL to vcc->push() in
atm_init_atmarp(), resulting in memory leak.

Let's serialise two ioctl() by lock_sock() and check vcc->push()
in atm_init_atmarp() to prevent memleak.

The Linux kernel CVE team has assigned CVE-2025-38546 to this issue.


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

	Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 5.4.296 with commit 2fb37ab3226606cbfc9b2b6f9e301b0b735734c5
	Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 5.10.240 with commit 9e4dbeee56f614e3f1e166e5d0655a999ea185ef
	Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 5.15.189 with commit 1c075e88d5859a2c6b43b27e0e46fb281cef8039
	Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.1.146 with commit 0c17ff462d98c997d707ee5cf4e4a9b1b52b9d90
	Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.6.99 with commit 1fb9fb5a4b5cec2d56e26525ef8c519de858fa60
	Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.12.39 with commit 9f771816f14da6d6157a8c30069091abf6b566fb
	Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.15.7 with commit cb2e4a2f8f268d8fba6662f663a2e57846f14a8d
	Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.16 with commit 62dba28275a9a3104d4e33595c7b3328d4032d8d

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-2025-38546
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/2fb37ab3226606cbfc9b2b6f9e301b0b735734c5
	https://git.kernel.org/stable/c/9e4dbeee56f614e3f1e166e5d0655a999ea185ef
	https://git.kernel.org/stable/c/1c075e88d5859a2c6b43b27e0e46fb281cef8039
	https://git.kernel.org/stable/c/0c17ff462d98c997d707ee5cf4e4a9b1b52b9d90
	https://git.kernel.org/stable/c/1fb9fb5a4b5cec2d56e26525ef8c519de858fa60
	https://git.kernel.org/stable/c/9f771816f14da6d6157a8c30069091abf6b566fb
	https://git.kernel.org/stable/c/cb2e4a2f8f268d8fba6662f663a2e57846f14a8d
	https://git.kernel.org/stable/c/62dba28275a9a3104d4e33595c7b3328d4032d8d