linux-cve-announce - CVE-2025-71108: usb: typec: ucsi: Handle incorrect num

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Message-ID: <2026011411-CVE-2025-71108-2969@gregkh>
Date: Wed, 14 Jan 2026 16:06:13 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-71108: usb: typec: ucsi: Handle incorrect num_connectors capability

From: Greg Kroah-Hartman <gregkh@...nel.org>

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.

The Linux kernel CVE team has assigned CVE-2025-71108 to this issue.


Affected and fixed versions
===========================

	Fixed in 6.1.160 with commit f72f97d0aee4a993a35f2496bca5efd24827235d
	Fixed in 6.6.120 with commit 914605b0de8128434eafc9582445306830748b93
	Fixed in 6.12.64 with commit 3042a57a8e8bce4a3100c3f6f03dc372aab24943
	Fixed in 6.18.3 with commit 132fe187e0d940f388f839fe2cde9b84106ad20d
	Fixed in 6.19-rc1 with commit 30cd2cb1abf4c4acdb1ddb468c946f68939819fb

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2025-71108
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	drivers/usb/typec/ucsi/ucsi.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/f72f97d0aee4a993a35f2496bca5efd24827235d
	https://git.kernel.org/stable/c/914605b0de8128434eafc9582445306830748b93
	https://git.kernel.org/stable/c/3042a57a8e8bce4a3100c3f6f03dc372aab24943
	https://git.kernel.org/stable/c/132fe187e0d940f388f839fe2cde9b84106ad20d
	https://git.kernel.org/stable/c/30cd2cb1abf4c4acdb1ddb468c946f68939819fb