Bug 1516257 (CVE-2017-16648)

Summary:	CVE-2017-16648 kernel: Use-after-free in drivers/media/dvb-core/dvb_frontend.c
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	agordeev, airlied, ajax, aquini, bhu, blc, bskeggs, dhoward, ewk, fhrbata, hdegoede, hkrzesin, hwkernel-mgr, iboverma, ichavero, itamar, jarodwilson, jeremy, jforbes, jkacur, john.j5live, jonathan, josef, jross, jwboyer, kernel-maint, kernel-mgr, lgoncalv, linville, mchehab, mcressma, mjg59, mlangsdo, nmurray, rt-maint, rvrbovsk, skozina, steved, vdronov, williams, wmealing
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	kernel 4.14	Doc Type:	If docs needed, set a value
Doc Text:	The dvb frontend management subsystem in the Linux kernel contains a use-after-free which can allow a malicious user to write to memory that may be assigned to another kernel structure. This could create memory corruption, panic, or possibly other side affects.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-10-27 10:53:40 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:	1516274, 1546036, 1546037, 1546038
Bug Blocks:	1516259

Description Andrej Nemec 2017-11-22 11:27:22 UTC

The dvb_frontend_free function in drivers/media/dvb-core/dvb_frontend.c in the Linux kernel through 4.13.11 allows local users to cause a denial of service (use-after-free and system crash) or possibly have unspecified other impact via a crafted USB device. NOTE: the function was later renamed __dvb_frontend_free.

References:

https://groups.google.com/forum/#!msg/syzkaller/0HJQqTm0G_g/T931ItskBAAJ

https://patchwork.kernel.org/patch/10046189/

Upstream Fixes:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b1cb7372fa822af6c06c8045963571d13ad6348b

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b1728ff617f88a1f7a5d8c8f21fe17a2f6af5d16

Comment 1 Andrej Nemec 2017-11-22 11:53:03 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1516274]

Comment 6 Eric Christensen 2018-02-19 15:20:04 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.

This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux kernel-alt package.

Future Linux kernel updates for the respective releases may address this issue.

Comment 7 errata-xmlrpc 2018-10-30 08:56:30 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:2948 https://access.redhat.com/errata/RHSA-2018:2948