Bug 1992731 (CVE-2021-38201)

Summary:	CVE-2021-38201 kernel: slab-out-of-bounds access in xdr_set_page_base() in net/sunrpc/xdr.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, adscvr, airlied, alciregi, bdettelb, bhu, brdeoliv, bskeggs, chwhite, crwood, dhoward, dvlasenk, fhrbata, fpacheco, hdegoede, hkrzesin, jarod, jarodwilson, jeremy, jforbes, jglisse, jlelli, jonathan, josef, jshortt, jstancek, jwboyer, kcarcia, kernel-maint, kernel-mgr, lgoncalv, linville, masami256, mchehab, nmurray, ptalbert, qzhao, rvrbovsk, steved, tomckay, walters, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	Linux kernel 5.14-rc1	Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in the Linux kernel that allows remote attackers to cause a denial of service (xdr_set_page_base slab-out-of-bounds access) by performing many NFS 4.2 READ_PLUS operations. The highest threat from this vulnerability is to system availability.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-09-07 20:33:29 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:	1969751, 1990404, 1992733, 1993255, 1993256, 1993257
Bug Blocks:	1992735

Description Guilherme de Almeida Suckevicz 2021-08-11 16:42:15 UTC

net/sunrpc/xdr.c in the Linux kernel before 5.13.4 allows remote attackers to cause a denial of service (xdr_set_page_base slab-out-of-bounds access) by performing many NFS 4.2 READ_PLUS operations.

Reference and upstream patch:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6d1c0f3d28f98ea2736128ed3e46821496dc3a8c

Comment 1 Guilherme de Almeida Suckevicz 2021-08-11 16:42:49 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1992733]

Comment 2 Justin M. Forbes 2021-08-11 22:12:45 UTC

This was fixed for Fedora with the 5.13.4 stable kernel updates.

Comment 6 juneau 2021-08-12 16:36:00 UTC

Hosted OpenShift v3.x unaffected. v4.x, quay-io affected/delegated.

Comment 8 errata-xmlrpc 2021-09-07 14:43:41 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:3440 https://access.redhat.com/errata/RHSA-2021:3440

Comment 9 errata-xmlrpc 2021-09-07 18:00:30 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:3447 https://access.redhat.com/errata/RHSA-2021:3447

Comment 10 Product Security DevOps Team 2021-09-07 20:33:29 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-2021-38201