Bug 1311568 (CVE-2016-2548)

Summary:	CVE-2016-2548 kernel: sound: linked lists of slave instances not unlinked immediately
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED DUPLICATE	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	agordeev, aquini, arm-mgr, bhu, dhoward, esammons, fhrbata, gansalmon, iboverma, itamar, jforbes, jkacur, joelsmith, jonathan, jross, jwboyer, kernel-maint, kernel-mgr, kstutsma, lgoncalv, lwang, madhu.chinakonda, matt, mchehab, mcressma, mguzik, nmurray, pholasek, plougher, rt-maint, rvrbovsk, vdronov, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-03-11 17:55:26 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:	1311573
Bug Blocks:	1311575

Description Andrej Nemec 2016-02-24 13:31:04 UTC

Some linked lists (active_list and ack_list) of slave instances
aren't unlinked immediately at stopping or closing, and this may lead
to unexpected accesses.

Upstream patch:

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b5a663aa426f4884c71cd8580adae73f33570f0d

External references:

http://seclists.org/oss-sec/2016/q1/133

Comment 1 Josh Boyer 2016-02-24 14:03:58 UTC

This is an identical fix to bug 1311566

This was fixed in 4.3.5 with:

commit ea7f3d59628930dc29482a292e2a55c81cac52a4
Author: Takashi Iwai <tiwai>
Date:   Thu Jan 14 16:30:58 2016 +0100

    ALSA: timer: Harden slave timer list handling
    
    commit b5a663aa426f4884c71cd8580adae73f33570f0d upstream.
    

and in 4.4.1 with:

commit 8eff3aa0a9bbb593dce0ec0344ec1961318e44c8
Author: Takashi Iwai <tiwai>
Date:   Thu Jan 14 16:30:58 2016 +0100

    ALSA: timer: Harden slave timer list handling
    
    commit b5a663aa426f4884c71cd8580adae73f33570f0d upstream.

All Fedora branches are on those or newer.  This issue is fixed in Fedora.

Comment 2 Vladis Dronov 2016-03-11 17:55:26 UTC


*** This bug has been marked as a duplicate of bug 1311566 ***

Comment 3 Doran Moppert 2020-02-10 04:31:22 UTC

Statement:

This flaw was found to be a duplicate of CVE-2016-2547. Please see https://access.redhat.com/security/cve/CVE-2016-2547 for information about affected products and security errata.