Bug 1760441 (CVE-2019-16234)

Summary:	CVE-2019-16234 kernel: null pointer dereference in drivers/net/wireless/intel/iwlwifi/pcie/trans.c
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	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, plougher, rt-maint, rvrbovsk, steved, 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 check was not done on the alloc_workqueue return value of the iwl_trans_pcie_alloc function potentially leading to a NULL pointer dereference. This error condition could lead to a denial of service. The highest threat from this vulnerability is to system availability.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-04-30 17:10:15 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:	1760442
Bug Blocks:	1760443

Description Guilherme de Almeida Suckevicz 2019-10-10 14:38:48 UTC

drivers/net/wireless/intel/iwlwifi/pcie/trans.c in the Linux kernel 5.2.14 does not check the alloc_workqueue return value, leading to a NULL pointer dereference.

Reference:
https://lkml.org/lkml/2019/9/9/487

Comment 1 Guilherme de Almeida Suckevicz 2019-10-10 14:39:11 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1760442]

Comment 2 Justin M. Forbes 2020-03-19 21:46:34 UTC

This was fixed for Fedora with the 5.4 kernel rebases.

Comment 3 Petr Matousek 2020-04-30 16:47:28 UTC

Upstream fix:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8188a18ee2e48c9a7461139838048363bfce3fef

Comment 4 Petr Matousek 2020-04-30 17:07:07 UTC

Statement:

This issue is rated as having Low impact because of the preconditions needed to trigger the error/resource cleanup code path (system-wide out-of-memory condition, high privileges or physical access). The attacker would have to be able to induce system-wide out-of-memory condition which itself could be seen as a local denial of service. It could be argued that having such privileges has the same impact as the flaw itself.

Comment 5 Petr Matousek 2020-04-30 17:07:11 UTC

Mitigation:

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Comment 6 Eric Christensen 2020-05-04 18:05:58 UTC

External References:

https://lkml.org/lkml/2019/9/9/487