CVE-2025-40157
Description
A flaw was found in the Linux kernel's i10nm_edac driver. A local user with elevated privileges could trigger a denial of service when the driver is loaded on systems where a memory controller is disabled by the BIOS due to unpopulated memory modules (DIMMs). This specific condition causes a shift-out-of-bounds error, leading to a system crash and making the system unavailable.
Statement
The i10nm_edac fix skips DIMM enumeration when a memory controller is disabled, preventing a UBSAN shift-out-of-bounds during driver init. This cannot be triggered remotely and requires privileged module loading plus a specific firmware state, so it’s low-risk (DoS-only) operational hardening rather than a meaningful security issue.
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 | 4.4 | N/A | N/A |
| Attack Vector | Local | N/A | N/A |
| Attack Complexity | Low | N/A | N/A |
| Privileges Required | High | N/A | N/A |
| User Interaction | None | N/A | N/A |
| Scope | Unchanged | N/A | N/A |
| Confidentiality | None | N/A | N/A |
| Integrity Impact | None | N/A | N/A |
| Availability Impact | High | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Understanding the Weakness (CWE)
Availability,Integrity
Technical Impact: Unexpected State; DoS: Crash, Exit, or Restart
An unexpected return value could place the system in a state that could lead to a crash or other unintended behaviors.
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