CVE-2025-71108
Description
A firmware compatibility issue was found in the Linux kernel's USB Type-C UCSI driver. The UCSI specification defines num_connectors as a 7-bit field with the 8th bit reserved. Some buggy firmware incorrectly sets this reserved bit, causing the driver to interpret an invalid connector count. This can prevent the system from booting properly when the UCSI driver is loaded.
Statement
This issue was discovered on Lenovo P1 G8 hardware during Linux enablement. It affects systems with non-compliant UCSI firmware that sets the reserved bit in the num_connectors capability field. The kernel fix auto-corrects the value to allow proper system boot. This is primarily a firmware bug that the kernel now works around rather than a security vulnerability.
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 | 3.3 | 5.5 | N/A |
| Attack Vector | Local | Local | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | Low | Low | N/A |
| User Interaction | None | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | None | None | N/A |
| Integrity Impact | None | None | N/A |
| Availability Impact | Low | High | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
NVD: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Understanding the Weakness (CWE)
Other
Technical Impact: Varies by Context
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