Bug 2018212 (CVE-2021-0938)

Summary:	CVE-2021-0938 kernel: possible bypass of defense in depth due to uninitialized data in memzero_explicit() of compiler-clang.h
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	acaringi, adscvr, airlied, alciregi, bdettelb, bhu, blc, brdeoliv, bskeggs, chwhite, crwood, dhoward, dvlasenk, fhrbata, fpacheco, hdegoede, hkrzesin, jarod, jarodwilson, jburrell, jeremy, jforbes, jglisse, jlelli, jonathan, josef, jshortt, jstancek, jwboyer, kcarcia, kernel-maint, kernel-mgr, lgoncalv, linville, masami256, mchehab, mlangsdo, nmurray, ptalbert, qzhao, rvrbovsk, steved, vkumar, 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:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-11-02 16:34:53 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:	2018213
Bug Blocks:	2018214

Description Guilherme de Almeida Suckevicz 2021-10-28 14:13:49 UTC

In memzero_explicit of compiler-clang.h, there is a possible bypass of defense in depth due to uninitialized data. This could lead to local information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-171418586References: Upstream kernel.

References:
https://source.android.com/security/bulletin/pixel/2021-10-01
https://android.googlesource.com/kernel/common/+/b207caff4176

Comment 1 Guilherme de Almeida Suckevicz 2021-10-28 14:14:37 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2018213]

Comment 2 Justin M. Forbes 2021-11-02 21:03:02 UTC

This was fixed for Fedora with the 5.9.15 stable kernel updates.