Bug 1291197 (CVE-2015-7550)

Summary:	CVE-2015-7550 kernel: User triggerable crash from race between key read and rey revoke
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	aquini, arm-mgr, bhu, blc, carnil, dhoward, fhrbata, gansalmon, iboverma, itamar, jforbes, jkacur, joelsmith, jonathan, jross, jwboyer, kernel-maint, kernel-mgr, kstutsma, lgoncalv, madhu.chinakonda, matt, mchehab, mcressma, mlangsdo, mrg-program-list, nmurray, osoukup, plougher, rt-maint, rvrbovsk, slawomir, slong, williams, wmealing
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	A NULL-pointer dereference flaw was found in the kernel, which is caused by a race between revoking a user-type key and reading from it. The issue could be triggered by an unprivileged user with a local account, causing the kernel to crash (denial of service).	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-08 02:46:23 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:	1290370, 1291198, 1293401, 1293402
Bug Blocks:	1291199

Description Adam Mariš 2015-12-14 09:33:45 UTC

A race between revoking a user-type key and reading from it was found causing a null pointer dereference and the kernel to crash. This condition can be triggered by unprivileged user with a local account.


Proposed patch:

https://bugzilla.redhat.com/attachment.cgi?id=1104753&action=diff
http://marc.info/?l=linux-kernel&m=145040247605360

Comment 1 Adam Mariš 2015-12-14 09:34:24 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1291198]

Comment 5 Fedora Update System 2015-12-22 07:20:36 UTC

kernel-4.2.8-200.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.

Comment 6 Fedora Update System 2015-12-22 22:01:49 UTC

kernel-4.2.8-300.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.

Comment 7 Wade Mealing 2016-01-18 02:30:38 UTC

Statement:

This issue affects the Linux kernels as shipped with Red Hat Enterprise Linux 5,6 and 7 and may be addressed in a future update.