Bug 2429612 (CVE-2025-71108) - CVE-2025-71108 kernel: usb: typec: ucsi: Handle incorrect num_connectors capability
Summary: CVE-2025-71108 kernel: usb: typec: ucsi: Handle incorrect num_connectors capa...
Keywords:
Status: NEW
Alias: CVE-2025-71108
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-01-14 16:04 UTC by OSIDB Bzimport
Modified: 2026-01-14 18:26 UTC (History)
0 users

Fixed In Version:
Clone Of:
Environment:
Last Closed:
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Description OSIDB Bzimport 2026-01-14 16:04:38 UTC
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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