linux-cve-announce - CVE-2025-21918: usb: typec: ucsi: Fix NULL pointer access

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Message-ID: <2025040131-CVE-2025-21918-dc4c@gregkh>
Date: Tue,  1 Apr 2025 16:39:42 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2025-21918: usb: typec: ucsi: Fix NULL pointer access

Description
===========

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

usb: typec: ucsi: Fix NULL pointer access

Resources should be released only after all threads that utilize them
have been destroyed.
This commit ensures that resources are not released prematurely by waiting
for the associated workqueue to complete before deallocating them.

The Linux kernel CVE team has assigned CVE-2025-21918 to this issue.


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

	Issue introduced in 5.16 with commit b9aa02ca39a49740926c2c450a1505a4a0f8954a and fixed in 6.6.83 with commit 46fba7be161bb89068958138ea64ec33c0b446d4
	Issue introduced in 5.16 with commit b9aa02ca39a49740926c2c450a1505a4a0f8954a and fixed in 6.12.19 with commit 079a3e52f3e751bb8f5937195bdf25c5d14fdff0
	Issue introduced in 5.16 with commit b9aa02ca39a49740926c2c450a1505a4a0f8954a and fixed in 6.13.7 with commit 592a0327d026a122e97e8e8bb7c60cbbe7697344
	Issue introduced in 5.16 with commit b9aa02ca39a49740926c2c450a1505a4a0f8954a and fixed in 6.14 with commit b13abcb7ddd8d38de769486db5bd917537b32ab1

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-2025-21918
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/46fba7be161bb89068958138ea64ec33c0b446d4
	https://git.kernel.org/stable/c/079a3e52f3e751bb8f5937195bdf25c5d14fdff0
	https://git.kernel.org/stable/c/592a0327d026a122e97e8e8bb7c60cbbe7697344
	https://git.kernel.org/stable/c/b13abcb7ddd8d38de769486db5bd917537b32ab1