Bug 2181614 (CVE-2020-36691)

Summary:	CVE-2020-36691 kernel: lib/nlattr.c allows attackers to cause a denial of service
Product:	[Other] Security Response	Reporter:	Pedro Sampaio <psampaio>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	acaringi, allarkin, bhu, chwhite, crwood, dbohanno, ddepaula, debarbos, dfreiber, dvlasenk, ezulian, hkrzesin, jarod, jburrell, jdenham, jfaracco, jferlan, jforbes, jlelli, joe.lawrence, jshortt, jstancek, jwyatt, kcarcia, kernel-mgr, ldoskova, lgoncalv, lleshchi, lzampier, nmurray, ptalbert, qzhao, rogbas, rrobaina, rvrbovsk, rysulliv, scweaver, tyberry, vkumar, walters, wcosta, williams, wmealing, ycote
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	Kernel 5.8 RC1	Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in lib/nlattr.c in the Linux kernel, before 5.8. This issue may allow an attacker to cause a denial of service (unbounded recursion) through a nested Netlink policy with a back reference.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2023-03-26 18:05:46 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:	2181615

Description Pedro Sampaio 2023-03-24 19:23:17 UTC

An issue was discovered in the Linux kernel before 5.8. lib/nlattr.c allows attackers to cause a denial of service (unbounded recursion) via a nested Netlink policy with a back reference.

References:

https://github.com/torvalds/linux/commit/7690aa1cdf7c4565ad6b013b324c28b685505e24
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8

Comment 1 Rohit Keshri 2023-03-26 14:04:03 UTC

The affected code was not introduced into any kernel versions shipped with Red Hat Enterprise Linux making this vulnerable not applicable to these platforms.

Comment 4 Product Security DevOps Team 2023-03-26 18:05:42 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-2020-36691