linux-cve-announce - CVE-2025-40089: cxl/features: Add check for no entries in cxl_feature

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Message-ID: <2025103015-CVE-2025-40089-26ca@gregkh>
Date: Thu, 30 Oct 2025 10:48:16 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-40089: cxl/features: Add check for no entries in cxl_feature_info

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

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

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

cxl/features: Add check for no entries in cxl_feature_info

cxl EDAC calls cxl_feature_info() to get the feature information and
if the hardware has no Features support, cxlfs may be passed in as
NULL.

[   51.957498] BUG: kernel NULL pointer dereference, address: 0000000000000008
[   51.965571] #PF: supervisor read access in kernel mode
[   51.971559] #PF: error_code(0x0000) - not-present page
[   51.977542] PGD 17e4f6067 P4D 0
[   51.981384] Oops: Oops: 0000 [#1] SMP NOPTI
[   51.986300] CPU: 49 UID: 0 PID: 3782 Comm: systemd-udevd Not tainted 6.17.0dj
test+ #64 PREEMPT(voluntary)
[   51.997355] Hardware name: <removed>
[   52.009790] RIP: 0010:cxl_feature_info+0xa/0x80 [cxl_core]

Add a check for cxlfs before dereferencing it and return -EOPNOTSUPP if
there is no cxlfs created due to no hardware support.

The Linux kernel CVE team has assigned CVE-2025-40089 to this issue.


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

	Issue introduced in 6.15 with commit eb5dfcb9e36d0e46089fec777d911313c1876fa3 and fixed in 6.17.5 with commit b8a69e3b1a460bf5d96dd53cbd121aa2cd346886
	Issue introduced in 6.15 with commit eb5dfcb9e36d0e46089fec777d911313c1876fa3 and fixed in 6.18-rc2 with commit a375246fcf2bbdaeb1df7fa7ee5a8b884a89085e

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-2025-40089
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/cxl/core/features.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/b8a69e3b1a460bf5d96dd53cbd121aa2cd346886
	https://git.kernel.org/stable/c/a375246fcf2bbdaeb1df7fa7ee5a8b884a89085e