CVE-2025-40089

/// Technical 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.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References