CVE-2025-71108

MEDIUM

Linux Kernel - Denial of Service via UCSI num_connectors Capability Handling

Title source: llm
STIX 2.1

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.

Scores

CVSS v3 5.5
EPSS 0.0003
EPSS Percentile 9.8%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Details

Status published
Products (25)
linux/Kernel 4.13.0 - 5.10.248linux
linux/Kernel 5.11.0 - 5.15.198linux
linux/Kernel 5.16.0 - 6.1.160linux
linux/Kernel 6.13.0 - 6.18.3linux
linux/Kernel 6.2.0 - 6.6.120linux
linux/Kernel 6.7.0 - 6.12.64linux
Linux/Linux < 4.13
Linux/Linux 4.13
Linux/Linux 5.10.248 - 5.10.*
Linux/Linux 5.15.198 - 5.15.*
... and 15 more
Published Jan 14, 2026
Tracked Since Feb 18, 2026