Bug 1696015 (CVE-2019-3892)

Summary:	CVE-2019-3892 kernel: fix race condition between mmget_not_zero()/get_task_mm() and core dumping
Product:	[Other] Security Response	Reporter:	Wade Mealing <wmealing>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED DUPLICATE	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	aarcange, acaringi, airlied, bhu, blc, brdeoliv, bskeggs, dhoward, dvlasenk, esammons, fhrbata, hdegoede, hkrzesin, iboverma, ichavero, itamar, jarodwilson, jeremy, jforbes, jglisse, jkacur, john.j5live, jonathan, josef, jross, jstancek, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, linville, matt, mchehab, mcressma, mjg59, mlangsdo, msiddiqu, nmurray, plougher, rt-maint, rvrbovsk, steved, 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:	A race condition was found between mmget_not_zero()/get_task_mm() when core dumping tasks. A local attacker is able to exploit race condition where locking of semaphore would allow an attacker to leak kernel memory to userspace.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-05-03 09:11:53 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:	1696007, 1696223

Description Wade Mealing 2019-04-04 02:55:40 UTC

A race condition was found between between mmget_not_zero()/get_task_mm() when core dumping tasks. A local attacker is able to exploit race condition where locking of semaphore would allow an attacker to leak kernel memory to userspace.


Upstream patch:
https://marc.info/?l=linux-mm&m=155355419911404&w=2

Comment 1 Wade Mealing 2019-04-04 02:56:26 UTC

Acknowledgments:

Name: Andrea Arcangeli (Red Hat Engineering)

Comment 4 Wade Mealing 2019-04-04 06:46:36 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1696078]

Comment 6 Vladis Dronov 2019-05-02 09:20:16 UTC

Note:

CVE-2019-11599 was kept and CVE-2019-3892 REJECTed as reservation duplicate of CVE-2019-11599:

https://seclists.org/oss-sec/2019/q2/77

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-3892

Comment 7 msiddiqu 2019-05-03 09:11:53 UTC


*** This bug has been marked as a duplicate of bug 1705937 ***

Comment 8 Doran Moppert 2020-02-10 04:37:00 UTC

Statement:

This flaw was found to be a duplicate of CVE-2019-11599. Please see https://access.redhat.com/security/cve/CVE-2019-11599 for information about affected products and security errata.