Bug 1432429 (CVE-2017-6874)

Summary:	CVE-2017-6874 kernel: Race condition in kernel/ucount.c
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	agordeev, aquini, bhu, dhoward, esammons, fhrbata, gansalmon, hwkernel-mgr, iboverma, ichavero, itamar, jforbes, jkacur, jkastner, jonathan, jross, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, lwang, madhu.chinakonda, matt, mchehab, mcressma, mguzik, nmurray, pholasek, plougher, rt-maint, rvrbovsk, 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:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-03-15 11:34:21 UTC	Type:	---
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Documentation:	---	CRM:
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1432430
Bug Blocks:

Description Andrej Nemec 2017-03-15 11:30:18 UTC

Race condition in kernel/ucount.c in the Linux kernel allows local users to cause a denial of service (use-after-free and system crash) or possibly have unspecified other impact via crafted system calls that leverage certain decrement behavior that causes incorrect interaction between put_ucounts and get_ucounts.

Upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=040757f738e13caaa9c5078bca79aa97e11dde88

Comment 1 Andrej Nemec 2017-03-15 11:31:07 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1432430]

Comment 2 Andrej Nemec 2017-03-15 11:34:21 UTC

Statement:

This issue did not affect the versions of the Linux kernel as shipped with Red Hat Enterprise Linux and Red Hat Enterprise MRG as they did not include the vulnerable code.

Comment 3 Fedora Update System 2017-03-28 23:53:20 UTC

kernel-4.9.17-100.fc24 has been pushed to the Fedora 24 stable repository. If problems still persist, please make note of it in this bug report.