CVE-2026-23348

/// Technical description

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

cxl: Fix race of nvdimm_bus object when creating nvdimm objects

Found issue during running of cxl-translate.sh unit test. Adding a 3s

sleep right before the test seems to make the issue reproduce fairly

consistently. The cxl_translate module has dependency on cxl_acpi and

causes orphaned nvdimm objects to reprobe after cxl_acpi is removed.

The nvdimm_bus object is registered by the cxl_nvb object when

cxl_acpi_probe() is called. With the nvdimm_bus object missing,

__nd_device_register() will trigger NULL pointer dereference when

accessing the dev->parent that points to &nvdimm_bus->dev.

[ 192.884510] BUG: kernel NULL pointer dereference, address: 000000000000006c

[ 192.895383] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS edk2-20250812-19.fc42 08/12/2025

[ 192.897721] Workqueue: cxl_port cxl_bus_rescan_queue [cxl_core]

[ 192.899459] RIP: 0010:kobject_get+0xc/0x90

[ 192.924871] Call Trace:

[ 192.9259

/// 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