linux-cve-announce - CVE-2024-50298: net: enetc: allocate vf

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Message-ID: <2024111903-CVE-2024-50298-2ef7@gregkh>
Date: Tue, 19 Nov 2024 02:32:53 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-50298: net: enetc: allocate vf_state during PF probes

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

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

net: enetc: allocate vf_state during PF probes

In the previous implementation, vf_state is allocated memory only when VF
is enabled. However, net_device_ops::ndo_set_vf_mac() may be called before
VF is enabled to configure the MAC address of VF. If this is the case,
enetc_pf_set_vf_mac() will access vf_state, resulting in access to a null
pointer. The simplified error log is as follows.

root@...028ardb:~# ip link set eno0 vf 1 mac 00:0c:e7:66:77:89
[  173.543315] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000004
[  173.637254] pc : enetc_pf_set_vf_mac+0x3c/0x80 Message from sy
[  173.641973] lr : do_setlink+0x4a8/0xec8
[  173.732292] Call trace:
[  173.734740]  enetc_pf_set_vf_mac+0x3c/0x80
[  173.738847]  __rtnl_newlink+0x530/0x89c
[  173.742692]  rtnl_newlink+0x50/0x7c
[  173.746189]  rtnetlink_rcv_msg+0x128/0x390
[  173.750298]  netlink_rcv_skb+0x60/0x130
[  173.754145]  rtnetlink_rcv+0x18/0x24
[  173.757731]  netlink_unicast+0x318/0x380
[  173.761665]  netlink_sendmsg+0x17c/0x3c8

The Linux kernel CVE team has assigned CVE-2024-50298 to this issue.


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

	Issue introduced in 5.1 with commit d4fd0404c1c9 and fixed in 6.6.61 with commit ef0edfbe9eee
	Issue introduced in 5.1 with commit d4fd0404c1c9 and fixed in 6.11.8 with commit 7eb923f8d481
	Issue introduced in 5.1 with commit d4fd0404c1c9 and fixed in 6.12 with commit e15c5506dd39

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-2024-50298
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:
	drivers/net/ethernet/freescale/enetc/enetc_pf.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/ef0edfbe9eeed1fccad7cb705648af5222664944
	https://git.kernel.org/stable/c/7eb923f8d4819737c07d6a8d0daef0a4d7f99e0c
	https://git.kernel.org/stable/c/e15c5506dd39885cd047f811a64240e2e8ab401b