linux-cve-announce - CVE-2025-38550: ipv6: mcast: Delay put pmc->idev in mld_del

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Message-ID: <2025081628-CVE-2025-38550-9bfd@gregkh>
Date: Sat, 16 Aug 2025 13:34:27 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-38550: ipv6: mcast: Delay put pmc->idev in mld_del_delrec()

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

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

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

ipv6: mcast: Delay put pmc->idev in mld_del_delrec()

pmc->idev is still used in ip6_mc_clear_src(), so as mld_clear_delrec()
does, the reference should be put after ip6_mc_clear_src() return.

The Linux kernel CVE team has assigned CVE-2025-38550 to this issue.


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

	Issue introduced in 5.13 with commit 63ed8de4be81b699ca727e9f8e3344bd487806d7 and fixed in 6.1.147 with commit 728db00a14cacb37f36e9382ab5fad55caf890cc
	Issue introduced in 5.13 with commit 63ed8de4be81b699ca727e9f8e3344bd487806d7 and fixed in 6.6.100 with commit dcbc346f50a009d8b7f4e330f9f2e22d6442fa26
	Issue introduced in 5.13 with commit 63ed8de4be81b699ca727e9f8e3344bd487806d7 and fixed in 6.12.40 with commit 7929d27c747eafe8fca3eecd74a334503ee4c839
	Issue introduced in 5.13 with commit 63ed8de4be81b699ca727e9f8e3344bd487806d7 and fixed in 6.15.8 with commit 5f18e0130194550dff734e155029ae734378b5ea
	Issue introduced in 5.13 with commit 63ed8de4be81b699ca727e9f8e3344bd487806d7 and fixed in 6.16 with commit ae3264a25a4635531264728859dbe9c659fad554

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-2025-38550
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/ipv6/mcast.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/728db00a14cacb37f36e9382ab5fad55caf890cc
	https://git.kernel.org/stable/c/dcbc346f50a009d8b7f4e330f9f2e22d6442fa26
	https://git.kernel.org/stable/c/7929d27c747eafe8fca3eecd74a334503ee4c839
	https://git.kernel.org/stable/c/5f18e0130194550dff734e155029ae734378b5ea
	https://git.kernel.org/stable/c/ae3264a25a4635531264728859dbe9c659fad554