Bug 1743502 (CVE-2018-20961)

Summary:	CVE-2018-20961 kernel: double free vulnerability in function f_midi_set_alt in drivers/usb/gadget/function/f_midi.c causing denial of service
Product:	[Other] Security Response	Reporter:	Dhananjay Arunesh <darunesh>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
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, plougher, rt-maint, rvrbovsk, steved, williams, yozone
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 vulnerability was found in the Linux kernel’s implementation of generic USB MIDI device handling. Some USB gadgets have multiple 'modes' devices that can switch between modes and possibly cause a double-free flaw. An attacker could use this flaw to cause a denial of service and possible memory corruption or privilege escalation.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-02-20 14:09:35 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:	1743503
Bug Blocks:	1743511

Description Dhananjay Arunesh 2019-08-20 07:07:28 UTC

A vulnerability was found in the Linux kernel, a double free vulnerability in the f_midi_set_alt function of drivers/usb/gadget/function/f_midi.c in the f_midi driver may allow attackers to cause a denial of service or possibly have unspecified other impact.

Reference:
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.16.4

Upstream commit:
https://github.com/torvalds/linux/commit/7fafcfdf6377b18b2a726ea554d6e593ba44349f
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=7fafcfdf6377b18b2a726ea554d6e593ba44349f

Comment 1 Dhananjay Arunesh 2019-08-20 07:07:45 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1743503]

Comment 2 Justin M. Forbes 2019-08-20 12:37:57 UTC

This was fixed for Fedora in the 4.16.4 stable updates.

Comment 4 Rohit Keshri 2020-02-20 09:50:29 UTC

Mitigation:

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Comment 5 Rohit Keshri 2020-02-20 09:51:33 UTC

Reproducer: 
No reproducer exists at this time.

Comment 6 Product Security DevOps Team 2020-02-20 14:09:35 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-2018-20961