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Unrated severityNVD Advisory· Published Jan 14, 2026· Updated Feb 9, 2026

usb: typec: ucsi: Handle incorrect num_connectors capability

CVE-2025-71108

Description

In the Linux kernel, the following vulnerability has been resolved:

usb: typec: ucsi: Handle incorrect num_connectors capability

The UCSI spec states that the num_connectors field is 7 bits, and the 8th bit is reserved and should be set to zero. Some buggy FW has been known to set this bit, and it can lead to a system not booting. Flag that the FW is not behaving correctly, and auto-fix the value so that the system boots correctly.

Found on Lenovo P1 G8 during Linux enablement program. The FW will be fixed, but seemed worth addressing in case it hit platforms that aren't officially Linux supported.

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Affected products

83

Patches

Vulnerability mechanics

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