Bug 1749976 (CVE-2019-15223)

Summary:	CVE-2019-15223 kernel: Null pointer dereference in the sound/usb/line6/driver.c
Product:	[Other] Security Response	Reporter:	Pedro Sampaio <psampaio>
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, jlelli, john.j5live, jonathan, josef, jross, jshortt, jstancek, jwboyer, kernel-maint, kernel-mgr, lgoncalv, linville, masami256, mchehab, mcressma, mjg59, mlangsdo, nmurray, 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 NULL pointer dereference flaw was found in the way the Line 6 POD USB driver in the Linux kernel handled disconnection. This flaw allows an attacker with physical access to the system to crash the system.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-10-25 09:53:17 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Bug Depends On:	1738610, 1749987, 1820447, 1820448
Bug Blocks:	1749989

Description Pedro Sampaio 2019-09-07 01:21:05 UTC

An issue was discovered in the Linux kernel before 5.1.8. There is a NULL pointer dereference caused by a malicious USB device in the sound/usb/line6/driver.c driver.

Upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0b074ab7fc0d575247b9cc9f93bb7e007ca38840

References:

https://syzkaller.appspot.com/bug?id=0c1e517c657d3de2361cb0cc2d3a8663c25039a7
http://www.openwall.com/lists/oss-security/2019/08/20/2

Comment 1 Pedro Sampaio 2019-09-07 02:33:30 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1749987]

Comment 2 Justin M. Forbes 2019-09-09 08:17:06 UTC

This was fixed for Fedora with the 5.1.8 stable kernel updates.

Comment 3 Petr Matousek 2020-04-03 06:11:03 UTC

Statement:

This issue is rated as having Low impact because of the physical access needed to trigger this issue.

Comment 4 Petr Matousek 2020-04-03 06:11:07 UTC

Mitigation:

To mitigate this issue, prevent module snd-usb-line6 from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.