CVE-2025-40057
Description
A flaw was found in the Linux kernel's PTP (Precision Time Protocol) subsystem. In max_vclocks_store(), when a user provides an excessively large value for the maximum number of virtual clocks, the subsequent kcalloc() call cannot handle the allocation request, triggering a kernel WARNING. A local user with access to the PTP sysfs interface could exploit this to cause a denial of service.
Statement
This vulnerability requires local access and permissions to write to PTP sysfs attributes. The impact is limited to triggering a kernel warning and potential denial of service. Systems not using PTP virtual clocks are not affected.
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 | N/A | N/A |
| Attack Vector | Local | N/A | N/A |
| Attack Complexity | Low | N/A | N/A |
| Privileges Required | Low | 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:L/UI:N/S:U/C:N/I:N/A:H
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