Bug 1794399 (CVE-2019-19966)

Summary:	CVE-2019-19966 kernel: use-after-free in cpia2_exit in drivers/media/usb/cpia2/cpia2_v4l.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, 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, labbott, 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 use-after-free flaw was found in the Linux kernel module, cpia2, in how it handled camera connections. This flaw allows an attacker with physical access to crash the system.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-02-18 13:54:45 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:	1794400
Bug Blocks:	1794401

Description Guilherme de Almeida Suckevicz 2020-01-23 14:04:47 UTC

In the Linux kernel before 5.1.6, there is a use-after-free in cpia2_exit() in drivers/media/usb/cpia2/cpia2_v4l.c that will cause denial of service.

Reference and upstream commit:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=dea37a97265588da604c6ba80160a287b72c7bfd

Comment 1 Guilherme de Almeida Suckevicz 2020-01-23 14:07:16 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1794400]

Comment 2 Justin M. Forbes 2020-01-23 19:11:23 UTC

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

Comment 3 Alex 2020-02-18 13:45:04 UTC

Mitigation:

To mitigate this issue, prevent module cpia2 from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.