Bug 1531142 (CVE-2017-17975)

Summary:	CVE-2017-17975 kernel: use-after-free in the usbtv_probe function in drivers/media/usb/usbtv/usbtv-core.c
Product:	[Other] Security Response	Reporter:	Laura Pardo <lpardo>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	airlied, ajax, aquini, bhu, blc, bskeggs, dhoward, esammons, ewk, fhrbata, hdegoede, hkrzesin, hwkernel-mgr, iboverma, ichavero, itamar, jarodwilson, jforbes, jglisse, jkacur, john.j5live, jonathan, josef, jross, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, linville, lpardo, lwang, matt, mchehab, mcressma, mguzik, mjg59, mlangsdo, nmurray, plougher, rvrbovsk, skozina, steved, vdronov, williams, wmealing, yozone
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	A use-after-free fault in the Linux kernel's usbtv driver could allow an attacker to cause a denial of service (system crash), or have unspecified other impacts, by triggering failure of audio registration of USB hardware using the usbtv kernel module.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2018-02-12 11:11:23 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:	1538929
Bug Blocks:	1538932

Description Laura Pardo 2018-01-04 16:25:49 UTC

There is a use-after-free in the usbtv driver, on an error path of the usbtv_probe function in drivers/media/usb/usbtv/usbtv-core.c in the Linux kernel through 4.14.10. This allows an attacker to cause a denial of service (system crash) or possibly have unspecified other impact by triggering failure of audio registration, because a kfree of the usbtv data structure occurs during a usbtv_video_free call, but the usbtv_video_fail label's code attempts to both access and free this data structure.

Comment 1 Laura Pardo 2018-01-04 16:53:06 UTC

References:
http://linuxtesting.org/pipermail/ldv-project/2017-November/001008.html

Comment 3 Adam Mariš 2018-01-26 07:50:40 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1538929]

Comment 5 Wade Mealing 2018-02-07 05:38:57 UTC

Statement:

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6, 7, MRG-2 and real time kernels as the code which can trigger the flaw is not present in the products listed.

Comment 7 Justin M. Forbes 2018-05-04 17:05:54 UTC

This was fixed for Fedora with the 4.15.16 stable updates.