Bug 1824918 (CVE-2020-11565)

Summary:	CVE-2020-11565 kernel: out-of-bounds write in mpol_parse_str function in mm/mempolicy.c
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	acaringi, airlied, allarkin, bhu, blc, brdeoliv, bskeggs, dhoward, dvlasenk, esammons, fhrbata, hdegoede, hkrzesin, iboverma, ichavero, itamar, jarodwilson, jeremy, jforbes, jglisse, jlelli, john.j5live, jonathan, josef, jross, jshortt, jstancek, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, linville, liwan, masami256, matt, mchehab, mcressma, mjg59, mlangsdo, nmurray, qzhao, 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:	An out-of-bounds write flaw was found in the Linux kernel. An empty nodelist in mempolicy.c is mishandled durig mount option parsing leading to a stack-based out-of-bounds write. The highest threat from this vulnerability is to system availability.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-07-07 19:28:15 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:	1824919, 1834434, 1834435, 1834436, 1834438, 1834439
Bug Blocks:	1824929

Description Guilherme de Almeida Suckevicz 2020-04-16 16:40:22 UTC

An issue was discovered in the Linux kernel through 5.6.2. mpol_parse_str in
mm/mempolicy.c has a stack-based out-of-bounds write because an empty nodelist
is mishandled during mount option parsing.

Reference and upstream commit:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=aa9f7d5172fac9bf1f09e678c35e287a40a7b7dd

Comment 1 Guilherme de Almeida Suckevicz 2020-04-16 16:42:09 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1824919]

Comment 2 Justin M. Forbes 2020-04-16 18:35:53 UTC

This was fixed for Fedora with the 5.5.16 stable kernel updates.

Comment 5 Alex 2020-05-11 17:41:41 UTC

Mitigation:

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Comment 7 errata-xmlrpc 2020-07-07 13:18:58 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:2854 https://access.redhat.com/errata/RHSA-2020:2854

Comment 8 Product Security DevOps Team 2020-07-07 19:28:15 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2020-11565

Comment 9 errata-xmlrpc 2020-09-29 18:59:53 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:4062 https://access.redhat.com/errata/RHSA-2020:4062

Comment 10 errata-xmlrpc 2020-09-29 20:54:08 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:4060 https://access.redhat.com/errata/RHSA-2020:4060

Comment 11 errata-xmlrpc 2020-11-04 00:50:51 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2020:4431 https://access.redhat.com/errata/RHSA-2020:4431

Comment 12 errata-xmlrpc 2020-11-04 02:23:16 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2020:4609 https://access.redhat.com/errata/RHSA-2020:4609