Bug 1507539 (CVE-2017-15951)

Summary:	CVE-2017-15951 kernel: Race condition in the KEYS subsystem
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, airlied, ajax, aquini, bhu, blc, bskeggs, dhoward, esammons, ewk, fhrbata, hdegoede, hkrzesin, hwkernel-mgr, iboverma, ichavero, itamar, jarodwilson, jeremy, jforbes, jglisse, jkacur, john.j5live, jonathan, josef, jross, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, linville, lwang, matt, mchehab, mcressma, mguzik, mjg59, mlangsdo, nmurray, plougher, rt-maint, rvrbovsk, slawomir, steved, vdronov, williams, yozone
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	kernel 4.13.10	Doc Type:	Bug Fix
Doc Text:	The KEYS subsystem in the Linux kernel before 4.13.10 does not correctly synchronize the actions of updating versus finding a key in the "negative" state to avoid a race condition, which allows local users to cause a denial of service or possibly have unspecified other impact via crafted system calls.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-11-16 13:41:44 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:	1514003
Bug Blocks:	1507540

Description Andrej Nemec 2017-10-30 14:19:33 UTC

The KEYS subsystem in the Linux kernel before 4.13.10 does not correctly synchronize the actions of updating versus finding a key in the "negative" state to avoid a race condition, which allows local users to cause a denial of service or possibly have unspecified other impact via crafted system calls.

References:

https://bugzilla.suse.com/show_bug.cgi?id=1065615

Upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=363b02dab09b3226f3bd1420dad9c72b79a42a76

Comment 1 Vladis Dronov 2017-11-16 13:19:49 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1514003]

Comment 4 Vladis Dronov 2017-11-16 13:41:44 UTC

Statement:

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6, 7 and MRG 2 as a code with the flaw is not present in the products listed.

Comment 5 Justin M. Forbes 2018-01-29 16:58:49 UTC

This was fixed for Fedora with the 4.13.10 stable updates.