CVE-2025-40336
Description
A flaw was found in the Linux kernel's GPU shared virtual memory (gpusvm) subsystem. When handling HMM (Heterogeneous Memory Management) ranges that partially cover a huge page (such as 2MB pages), the hmm_pfn_to_map_order() function may incorrectly map memory outside the intended range. This could result in mapping memory that is not mapped by the process's memory management, potentially exposing unauthorized memory regions or causing memory corruption.
Statement
This vulnerability affects systems using GPU drivers that utilize the gpusvm subsystem for shared virtual memory between CPU and GPU. Exploitation requires local access and the ability to use GPU memory mapping features. The impact includes potential information disclosure or memory corruption.
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 | 6.5 | N/A | 8.8 |
| Attack Vector | Local | N/A | Local |
| Attack Complexity | High | N/A | Low |
| Privileges Required | Low | N/A | Low |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Changed |
| Confidentiality | Low | N/A | High |
| Integrity Impact | High | N/A | High |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:H
cve.org: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
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