linux-cve-announce - CVE-2026-23104: ice: fix devlink reload call trace

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Message-ID: <2026020429-CVE-2026-23104-3802@gregkh>
Date: Wed,  4 Feb 2026 17:15:03 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2026-23104: ice: fix devlink reload call trace

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

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

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

ice: fix devlink reload call trace

Commit 4da71a77fc3b ("ice: read internal temperature sensor") introduced
internal temperature sensor reading via HWMON. ice_hwmon_init() was added
to ice_init_feature() and ice_hwmon_exit() was added to ice_remove(). As a
result if devlink reload is used to reinit the device and then the driver
is removed, a call trace can occur.

BUG: unable to handle page fault for address: ffffffffc0fd4b5d
Call Trace:
 string+0x48/0xe0
 vsnprintf+0x1f9/0x650
 sprintf+0x62/0x80
 name_show+0x1f/0x30
 dev_attr_show+0x19/0x60

The call trace repeats approximately every 10 minutes when system
monitoring tools (e.g., sadc) attempt to read the orphaned hwmon sysfs
attributes that reference freed module memory.

The sequence is:
1. Driver load, ice_hwmon_init() gets called from ice_init_feature()
2. Devlink reload down, flow does not call ice_remove()
3. Devlink reload up, ice_hwmon_init() gets called from
   ice_init_feature() resulting in a second instance
4. Driver unload, ice_hwmon_exit() called from ice_remove() leaving the
   first hwmon instance orphaned with dangling pointer

Fix this by moving ice_hwmon_exit() from ice_remove() to
ice_deinit_features() to ensure proper cleanup symmetry with
ice_hwmon_init().

The Linux kernel CVE team has assigned CVE-2026-23104 to this issue.

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

	Issue introduced in 6.8 with commit 4da71a77fc3be1fcb680c8d78e1a1fb8017905ad and fixed in 6.18.8 with commit 87c1dacca197cc64e06fedeb269e3dd6699bae60
	Issue introduced in 6.8 with commit 4da71a77fc3be1fcb680c8d78e1a1fb8017905ad and fixed in 6.19-rc7 with commit d3f867e7a04678640ebcbfb81893c59f4af48586

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-2026-23104
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_main.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/87c1dacca197cc64e06fedeb269e3dd6699bae60
	https://git.kernel.org/stable/c/d3f867e7a04678640ebcbfb81893c59f4af48586