SB2026032594 - NULL Pointer Dereference in Linux kernel cxl driver

Description

This security bulletin contains information about 1 vulnerability.

1) NULL Pointer Dereference (CVE-ID: CVE-2026-23348)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a race condition in the nvdimm_bus object handling within the CXL (Compute Express Link) subsystem when creating nvdimm objects. A local user can trigger a NULL pointer dereference by exploiting the race condition during device probing, leading to a kernel crash.

The issue arises when the nvdimm_bus object is missing during device registration, causing an invalid access to a null parent pointer in __nd_device_register().

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/5b230daeee420833287cc77314439903e5312f10
• https://git.kernel.org/stable/c/5fc4e150c5ada5f7d20d8f9f1b351f10481fbdf7
• https://git.kernel.org/stable/c/96a1fd0d84b17360840f344826897fa71049870e