Bug 2014623 (CVE-2021-3892)

Summary:	CVE-2021-3892 kernel: memory leak in fib6_rule_suppress could result in DoS
Product:	[Other] Security Response	Reporter:	Michael Kaplan <mkaplan>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED DUPLICATE	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	acaringi, adscvr, airlied, alciregi, allarkin, bdettelb, bhu, brdeoliv, bskeggs, carnil, chwhite, crwood, darunesh, dhoward, dvlasenk, eshatokhin, fhrbata, fpacheco, haliu, hdegoede, hkrzesin, jarod, jarodwilson, jburrell, jeremy, jforbes, jglisse, jlelli, jonathan, josef, jshortt, jstancek, jwboyer, kcarcia, kernel-maint, kernel-mgr, lgoncalv, linville, masami256, mchehab, nmurray, ptalbert, qzhao, rkeshri, rvrbovsk, security-response-team, steved, vkumar, walters, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	Kernel 5.4	Doc Type:	If docs needed, set a value
Doc Text:	A memory leak flaw was reported in firewalld when IPv6_rpfilter is enabled and a suppress_prefix rule is present in the IPv6 routing rules. In such scenarios, every incoming packet will leak an allocation in ip6_dst_cache slab cache.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-12-06 07:52:40 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:	2014648, 2014649, 2014650
Bug Blocks:	2008467

Description Michael Kaplan 2021-10-15 16:14:46 UTC

The kernel leaks memory when firewalld IPv6_rpfilter is enabled and a suppress_prefix rule is present in the IPv6 routing rules (used by certain tools such as wg-quick). In such scenarios, every incoming packet will leak an allocation in ip6_dst_cache slab cache.

Reference:

https://bugzilla.redhat.com/show_bug.cgi?id=2008123

Comment 10 Salvatore Bonaccorso 2021-11-26 19:51:42 UTC

Hi

Can you provide more information on it? Is this an issue known upstrem?

OTOH I found in SuSE Bugzilla: https://bugzilla.suse.com/show_bug.cgi?id=1192261 which would indicate this relates to upstream commit https://git.kernel.org/linus/ca7a03c4175366a92cee0ccc4fec0038c3266e26 .

If this is correct, would CVE-2021-3892 be a duplicate of CVE-2019-18198?

Regards,
Salvatore

Comment 11 Yogendra Jog 2021-12-06 04:57:47 UTC

Setting correct needinfo

Comment 12 Rohit Keshri 2021-12-06 07:50:50 UTC

In reply to comment #10:
> Hi
> 
> Can you provide more information on it? Is this an issue known upstrem?
> 
> OTOH I found in SuSE Bugzilla:
> https://bugzilla.suse.com/show_bug.cgi?id=1192261 which would indicate this
> relates to upstream commit
> https://git.kernel.org/linus/ca7a03c4175366a92cee0ccc4fec0038c3266e26 .
> 
> If this is correct, would CVE-2021-3892 be a duplicate of CVE-2019-18198?
Hello,

Yes, you are right. We have made CVE-2021-3892 a duplicate, thank you.

This flaw is fixed in the upstream  Kernel 5.4 with 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ca7a03c4175366a92cee0ccc4fec0038c3266e26

Comment 13 Rohit Keshri 2021-12-06 07:52:40 UTC


*** This bug has been marked as a duplicate of bug 1771486 ***

Comment 15 Salvatore Bonaccorso 2021-12-06 16:26:30 UTC

Thank you, will you officially mark the CVE-2021-3892 as REJECTED as CNA so that this would not cause potential confusion?

Comment 16 Rohit Keshri 2021-12-09 03:10:57 UTC

Hello Carnil, yes we will complete the cve rejection.