Bug 2420291 (CVE-2022-50642)

Summary:	CVE-2022-50642 kernel: platform/chrome: cros_ec_typec: zero out stale pointers
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	rhel-process-autobot, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A use-after-free vulnerability exists in the Chrome EC Type-C driver in the Linux kernel. When cros_typec_get_switch_handles() fails to obtain switch handles, it frees allocated pointers but doesn't zero them out. These stale pointers can later be dereferenced, causing use-after-free or double-free conditions.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2025-12-09 01:06:19 UTC

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.

Comment 1 Alexander B 2025-12-10 03:39:05 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025120936-CVE-2022-50642-6975@gregkh/T