Bug 1170691 (CVE-2014-9090)

Summary:	CVE-2014-9090 kernel: espfix64: local DoS via do_double_fault() due to improper handling of faults associated with SS segment register
Product:	[Other] Security Response	Reporter:	Vincent Danen <vdanen>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	aquini, bhu, carnil, dhoward, fhrbata, gansalmon, iboverma, itamar, jforbes, jkacur, jonathan, jross, jwboyer, kernel-maint, kernel-mgr, lgoncalv, madhu.chinakonda, matt, mchehab, mcressma, nmurray, plougher, pmatouse, rt-maint, rvrbovsk, williams, yoguma
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:	2019-06-08 02:37:02 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:
Bug Blocks:	1170693

Description Vincent Danen 2014-12-04 15:46:12 UTC

Common Vulnerabilities and Exposures assigned an identifier CVE-2014-9090 to
the following vulnerability:

Name: CVE-2014-9090
URL: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-9090
Assigned: 20141126
Reference: http://www.openwall.com/lists/oss-security/2014/11/26/5
Reference: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=6f442be2fb22be02cafa606f1769fa1e6f894441
Reference: https://github.com/torvalds/linux/commit/6f442be2fb22be02cafa606f1769fa1e6f894441

The do_double_fault function in arch/x86/kernel/traps.c in the Linux
kernel through 3.17.4 does not properly handle faults associated with
the Stack Segment (SS) segment register when espfix64 is involved,
which allows local users to cause a denial of service (panic) via a
modify_ldt system call, as demonstrated by sigreturn_32 in the
linux-clock-tests test suite.

Comment 4 Petr Matousek 2014-12-10 15:43:56 UTC

Statement:

Not vulnerable.

This issue did not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6, 7 and Red Hat Enterprise Linux MRG 2 because they do not have support for the x86-64 version of ESPfix functionality.

Comment 5 Fedora Update System 2014-12-12 04:06:54 UTC

kernel-3.17.4-302.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 6 Fedora Update System 2014-12-13 09:52:44 UTC

kernel-3.17.6-200.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 9 Fedora Update System 2015-01-05 07:34:51 UTC

kernel-3.14.27-100.fc19 has been pushed to the Fedora 19 stable repository.  If problems still persist, please make note of it in this bug report.