Bug 1995570 (CVE-2021-3736)

Summary:	CVE-2021-3736 kernel: uninitialized kernel stack may lead to information disclosure
Product:	[Other] Security Response	Reporter:	Marian Rehak <mrehak>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	acaringi, adscvr, airlied, alciregi, bhu, blc, brdeoliv, bskeggs, carnil, 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, rkeshri, rvrbovsk, security-response-team, steved, tuxmealux+redhatbz, 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:	A flaw was found in the Linux kernel. A memory leak problem was found in mbochs_ioctl in samples/vfio-mdev/mbochs.c in Virtual Function I/O (VFIO) Mediated devices. This flaw could allow a local attacker to leak internal kernel information.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-09-03 11:50:12 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:	2019859
Bug Blocks:	1986387

Description Marian Rehak 2021-08-19 12:35:45 UTC

A memory leak problem was found in mbochs_ioctl in samples/vfio-mdev/mbochs.c in Virtual Function I/O (VFIO) Mediated devices.  This flaw could allow a local attacker to leak internal kernel information.

Comment 4 Rohit Keshri 2021-11-03 13:59:06 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2019859]

Comment 5 Justin M. Forbes 2021-11-05 15:48:24 UTC

This was fixed for Fedora with the 5.14.6 stable kernel updates.

Comment 6 Gianluca Gabrielli 2021-11-09 11:00:41 UTC

Could you confirm if the fixing commit is de5494af4815a4c9328536c72741229b7de88e7f ?

Comment 7 Justin M. Forbes 2021-11-28 14:18:17 UTC

Yes, that is the correct commit from linus' tree.