Bug 1791954 (CVE-2019-20095)

Summary:	CVE-2019-20095 kernel: memory leak in mwifiex_tm_cmd in drivers/net/wireless/marvell/mwifiex/cfg80211.c
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	acaringi, airlied, bdettelb, bhu, blc, brdeoliv, bskeggs, dhoward, dvlasenk, esammons, fhrbata, hdegoede, hkrzesin, iboverma, ichavero, itamar, jarodwilson, jeremy, jforbes, jglisse, jlelli, john.j5live, jonathan, josef, jross, jschorr, jshortt, jstancek, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, linville, masami256, matt, mchehab, mcressma, mjg59, mlangsdo, nmurray, qzhao, rt-maint, rvrbovsk, steved, williams, wmealing
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's mwifiex driver implementation when connecting to other WiFi devices in "Test Mode." A kernel memory leak can occur if an error condition is met during the parameter negotiation. This issue can lead to a denial of service if multiple error conditions meeting the repeated connection attempts are attempted.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-04-16 16:32:10 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:	1791955, 1804971, 1804972, 1804973, 1804974, 1804975
Bug Blocks:	1791956

Description Guilherme de Almeida Suckevicz 2020-01-16 19:00:50 UTC

The Mwifiex driver implementation in the Linux kernel has a memory leak on the error condition when encountering an error condition when in 'Wifi test mode'. 

Wifi test mode is a 'region' mode that wireless devices can use that allows for full use of the wifi spectrum disregarding regional laws that prohibit broadcasting in certain ranges.

This requires a connection to another wifi device in "test mode" to create the error condition.

Reference and upstream commit:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=003b686ace820ce2d635a83f10f2d7f9c147dabc

Comment 1 Guilherme de Almeida Suckevicz 2020-01-16 19:03:09 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1791955]

Comment 2 Justin M. Forbes 2020-01-16 21:00:27 UTC

This was fixed for Fedora in the 5.1.6 stable kernel updates.

Comment 7 Wade Mealing 2020-02-20 02:29:09 UTC

Mitigation:

As connecting to a wireless device is not automatic and initiated by a user, not connecting to rogue access points would prevent this flaw from being abused.

Comment 8 errata-xmlrpc 2020-04-16 14:38:52 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:1493 https://access.redhat.com/errata/RHSA-2020:1493

Comment 9 Product Security DevOps Team 2020-04-16 16:32:10 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2019-20095

Comment 10 errata-xmlrpc 2020-09-29 18:59:04 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:4062 https://access.redhat.com/errata/RHSA-2020:4062

Comment 11 errata-xmlrpc 2020-09-29 20:53:03 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:4060 https://access.redhat.com/errata/RHSA-2020:4060