Bug 1935170 (CVE-2020-0423)

Summary:	CVE-2020-0423 kernel: use-after-free in binder_release_work of binder.c due to improper locking may lead to local escalation of privilege
Product:	[Other] Security Response	Reporter:	Marian Rehak <mrehak>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	acaringi, adscvr, airlied, alciregi, bdettelb, bhu, blc, bmasney, brdeoliv, bskeggs, chwhite, dhoward, dvlasenk, fhrbata, hdegoede, hkrzesin, jarodwilson, jeremy, jforbes, jglisse, jlelli, jonathan, josef, jshortt, jstancek, jwboyer, kcarcia, kernel-maint, kernel-mgr, lgoncalv, linville, masami256, mchehab, mlangsdo, nmurray, ptalbert, qzhao, rvrbovsk, steved, tomckay, walters, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	A use-after-free flaw was found in the binder_release_work of binder.c due to improper locking. This flaw can lead to the local escalation of privileges in the kernel where no additional execution privileges are needed. User interaction is not needed for exploitation. The highest threat to this vulnerability is to confidentiality, integrity, as well as system availability.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-03-04 14:20:15 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1935171
Bug Blocks:	1935173

Description Marian Rehak 2021-03-04 13:40:15 UTC

In binder_release_work of binder.c, there is a possible use-after-free due to improper locking. This could lead to local escalation of privilege in the kernel with no additional execution privileges needed. User interaction is not needed for exploitation.

References:

https://source.android.com/security/bulletin/2020-10-01

Comment 1 Marian Rehak 2021-03-04 13:41:41 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1935171]

Comment 2 RaTasha Tillery-Smith 2021-03-04 14:04:11 UTC

External References:

https://source.android.com/security/bulletin/2020-10-01

Comment 3 Justin M. Forbes 2021-03-04 15:21:34 UTC

The android platform drivers are not enabled on Fedora.