Bug 1775047 (CVE-2019-19058)

Summary:	CVE-2019-19058 kernel: A memory leak in the alloc_sgtable() function in drivers/net/wireless/intel/iwlwifi/fw/dbg.c allows for a DoS
Product:	[Other] Security Response	Reporter:	Marian Rehak <mrehak>
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, jshortt, jstancek, jwboyer, kernel-maint, kernel-mgr, lgoncalv, linville, masami256, matt, mchehab, mcressma, mjg59, mlangsdo, nmurray, qzhao, 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. The Intel Wireless WiFi MVM Firmware driver mishandles resource cleanup during device coredump. An attacker able to trigger the device coredump and system-wide out of memory conditions at the same time could use this flaw to crash the system. The highest threat from this vulnerability is to system availability.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-09-29 21:59:01 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:	1775048, 1776606, 1829371, 1829372, 1829373, 1829374, 1829375
Bug Blocks:	1775049

Description Marian Rehak 2019-11-21 11:37:49 UTC

A memory leak in the alloc_sgtable() function in drivers/net/wireless/intel/iwlwifi/fw/dbg.c in the Linux kernel through 5.3.11 allows attackers to cause a denial of service (memory consumption) by triggering alloc_page() failures.

Upstream Issue:

https://github.com/torvalds/linux/commit/b4b814fec1a5a849383f7b3886b654a13abbda7d

Comment 1 Marian Rehak 2019-11-21 11:38:09 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1775048]

Comment 3 Petr Matousek 2020-04-29 13:15:20 UTC

Statement:

This issue is rated as having Low impact because of the preconditions needed to trigger the resource cleanup code path (system-wide out-of-memory condition).

Comment 4 Petr Matousek 2020-04-29 13:15:24 UTC

Mitigation:

In order to mitigate this issue it is possible to prevent the affected code from being loaded by blacklisting the kernel module iwlmvm. For instructions relating to how to blacklist a kernel module refer to: https://access.redhat.com/solutions/41278 .

Comment 6 errata-xmlrpc 2020-09-29 18:58:22 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 7 errata-xmlrpc 2020-09-29 20:52:09 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

Comment 8 Product Security DevOps Team 2020-09-29 21:59:01 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-2019-19058