linux-cve-announce - CVE-2022-50642: platform/chrome: cros_ec

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Message-ID: <2025120936-CVE-2022-50642-6975@gregkh>
Date: Tue,  9 Dec 2025 09:01:43 +0900
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50642: platform/chrome: cros_ec_typec: zero out stale pointers

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

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

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

platform/chrome: cros_ec_typec: zero out stale pointers

`cros_typec_get_switch_handles` allocates four pointers when obtaining
type-c switch handles. These pointers are all freed if failing to obtain
any of them; therefore, pointers in `port` become stale. The stale
pointers eventually cause use-after-free or double free in later code
paths. Zeroing out all pointer fields after freeing to eliminate these
stale pointers.

The Linux kernel CVE team has assigned CVE-2022-50642 to this issue.


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

	Issue introduced in 5.9 with commit f28adb41dab4a2795fd959750df57adffd2bb0be and fixed in 5.15.86 with commit 0ceadb5a3e45f1b81cf54bd496b40a5e50b6bd40
	Issue introduced in 5.9 with commit f28adb41dab4a2795fd959750df57adffd2bb0be and fixed in 6.0.16 with commit b610758bb3e0674644c1255cdafc2f46b7e05ff9
	Issue introduced in 5.9 with commit f28adb41dab4a2795fd959750df57adffd2bb0be and fixed in 6.1.2 with commit 6613f36a2fa5c69e528bccba8b3d831f759dad2f
	Issue introduced in 5.9 with commit f28adb41dab4a2795fd959750df57adffd2bb0be and fixed in 6.2 with commit 9a8aadcf0b459c1257b9477fd6402e1d5952ae07

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-2022-50642
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/platform/chrome/cros_ec_typec.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/0ceadb5a3e45f1b81cf54bd496b40a5e50b6bd40
	https://git.kernel.org/stable/c/b610758bb3e0674644c1255cdafc2f46b7e05ff9
	https://git.kernel.org/stable/c/6613f36a2fa5c69e528bccba8b3d831f759dad2f
	https://git.kernel.org/stable/c/9a8aadcf0b459c1257b9477fd6402e1d5952ae07