SB20260815205 - NULL pointer dereference in Linux kernel cxl core driver

Description

This security bulletin contains information about 1 vulnerability.

1) NULL pointer dereference (CVE-ID: CVE-2026-74274)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: 6.8 [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]

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

The vulnerability exists due to a null pointer dereference in the cxl region auto-discovery target array handling in drivers/cxl/core/region.c when attaching endpoint decoders to an auto-assembly region. A local user can trigger auto-discovery with a target array containing NULL holes to cause a denial of service.

The issue can occur when a removed endpoint decoder leaves a NULL hole in the target array instead of being the last element.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/6fde3fcdfec438ba0df26e25a8ac7c3707211799
• https://git.kernel.org/stable/c/aa8a76711c15041ec1e42c3a74c15c2df0bd31f6