CVE-2026-23348
Description
A flaw was found in the Linux kernel, specifically within the CXL (Compute Express Link) and NVDIMM (Non-Volatile Dual In-line Memory Module) subsystems. A race condition can occur when NVDIMM objects attempt to reprobe after the cxl_acpi module is removed, while the nvdimm_bus object is missing. This can lead to a null pointer dereference, causing the system to crash and resulting in a Denial of Service (DoS).
Statement
This flaw affects systems with CXL memory devices and NVDIMM support. The race occurs during module unload/reload sequences when orphaned nvdimm objects reprobe after cxl_acpi removal. The missing nvdimm_bus causes NULL dereference in __nd_device_register(). Primarily affects CXL-capable systems during module operations.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.5 | 4.7 | N/A |
| Attack Vector | Local | Local | N/A |
| Attack Complexity | Low | High | N/A |
| Privileges Required | Low | Low | N/A |
| User Interaction | None | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | None | None | N/A |
| Integrity Impact | None | None | N/A |
| Availability Impact | High | High | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Understanding the Weakness (CWE)
Integrity,Confidentiality,Other
Technical Impact: Modify Application Data; Read Application Data; Alter Execution Logic
Frequently Asked Questions
Not sure what something means? Check out our Security Glossary.
Want to get errata notifications? Sign up here.
