linux-cve-announce - CVE-2024-50024: net: Fix an unsafe loop on the list

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Message-ID: <2024102129-CVE-2024-50024-a052@gregkh>
Date: Mon, 21 Oct 2024 21:39:30 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-50024: net: Fix an unsafe loop on the list

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

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

net: Fix an unsafe loop on the list

The kernel may crash when deleting a genetlink family if there are still
listeners for that family:

Oops: Kernel access of bad area, sig: 11 [#1]
  ...
  NIP [c000000000c080bc] netlink_update_socket_mc+0x3c/0xc0
  LR [c000000000c0f764] __netlink_clear_multicast_users+0x74/0xc0
  Call Trace:
__netlink_clear_multicast_users+0x74/0xc0
genl_unregister_family+0xd4/0x2d0

Change the unsafe loop on the list to a safe one, because inside the
loop there is an element removal from this list.

The Linux kernel CVE team has assigned CVE-2024-50024 to this issue.


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

	Issue introduced in 2.6.32 with commit b8273570f802 and fixed in 5.10.227 with commit 68ad5da6ca63
	Issue introduced in 2.6.32 with commit b8273570f802 and fixed in 5.15.168 with commit 1cdec792b245
	Issue introduced in 2.6.32 with commit b8273570f802 and fixed in 6.1.113 with commit 5f03a7f601f3
	Issue introduced in 2.6.32 with commit b8273570f802 and fixed in 6.6.57 with commit 3be342e0332a
	Issue introduced in 2.6.32 with commit b8273570f802 and fixed in 6.11.4 with commit 49f9b726bf2b
	Issue introduced in 2.6.32 with commit b8273570f802 and fixed in 6.12-rc3 with commit 1dae9f118718

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-2024-50024
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:
	include/net/sock.h
	net/netlink/af_netlink.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/68ad5da6ca630a276f0a5c924179e57724d00013
	https://git.kernel.org/stable/c/1cdec792b2450105b1314c5123a9a0452cb2c2f0
	https://git.kernel.org/stable/c/5f03a7f601f33cda1f710611625235dc86fd8a9e
	https://git.kernel.org/stable/c/3be342e0332a7c83eb26fbb22bf156fdca467a5d
	https://git.kernel.org/stable/c/49f9b726bf2bf3dd2caf0d27cadf4bc1ccf7a7dd
	https://git.kernel.org/stable/c/1dae9f1187189bc09ff6d25ca97ead711f7e26f9