linux-cve-announce - CVE-2025-39814: ice: fix NULL pointer dereference in ice_unplug_aux

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Message-ID: <2025091614-CVE-2025-39814-1765@gregkh>
Date: Tue, 16 Sep 2025 15:00:20 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-39814: ice: fix NULL pointer dereference in ice_unplug_aux_dev() on reset

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

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

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

ice: fix NULL pointer dereference in ice_unplug_aux_dev() on reset

Issuing a reset when the driver is loaded without RDMA support, will
results in a crash as it attempts to remove RDMA's non-existent auxbus
device:
echo 1 > /sys/class/net/<if>/device/reset

BUG: kernel NULL pointer dereference, address: 0000000000000008
...
RIP: 0010:ice_unplug_aux_dev+0x29/0x70 [ice]
...
Call Trace:
<TASK>
ice_prepare_for_reset+0x77/0x260 [ice]
pci_dev_save_and_disable+0x2c/0x70
pci_reset_function+0x88/0x130
reset_store+0x5a/0xa0
kernfs_fop_write_iter+0x15e/0x210
vfs_write+0x273/0x520
ksys_write+0x6b/0xe0
do_syscall_64+0x79/0x3b0
entry_SYSCALL_64_after_hwframe+0x76/0x7e

ice_unplug_aux_dev() checks pf->cdev_info->adev for NULL pointer, but
pf->cdev_info will also be NULL, leading to the deref in the trace above.

Introduce a flag to be set when the creation of the auxbus device is
successful, to avoid multiple NULL pointer checks in ice_unplug_aux_dev().

The Linux kernel CVE team has assigned CVE-2025-39814 to this issue.

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

	Issue introduced in 6.16 with commit c24a65b6a27c78d8540409800886b6622ea86ebf and fixed in 6.16.5 with commit db783756a7d7cfaea039411971d0dc0a374e85cb
	Issue introduced in 6.16 with commit c24a65b6a27c78d8540409800886b6622ea86ebf and fixed in 6.17-rc4 with commit 60dfe2434eed13082f26eb7409665dfafb38fa51

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-2025-39814
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/intel/ice/ice.h
	drivers/net/ethernet/intel/ice/ice_idc.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/db783756a7d7cfaea039411971d0dc0a374e85cb
	https://git.kernel.org/stable/c/60dfe2434eed13082f26eb7409665dfafb38fa51