Bug 2266386 (CVE-2021-46913)

Summary:	CVE-2021-46913 kernel: netfilter: nftables: clone set element expression template
Product:	[Other] Security Response	Reporter:	Mauro Matteo Cascella <mcascell>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	acaringi, allarkin, aquini, bhu, chwhite, cye, cyin, dbohanno, debarbos, dfreiber, drow, dvlasenk, esandeen, ezulian, hkrzesin, jarod, jburrell, jdenham, jfaracco, jforbes, jlelli, joe.lawrence, jshortt, jstancek, jwyatt, kcarcia, ldoskova, lgoncalv, lzampier, mleitner, mmilgram, mstowell, nmurray, psutter, ptalbert, rparrazo, rrobaina, rvrbovsk, rysulliv, scweaver, sukulkar, tglozar, tyberry, vkumar, wcosta, williams, wmealing, ycote, ykopkova, zhijwang
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 denial of service flaw was found in netfilter's nftable sub component in the Linux Kernel. The connlimit garbage collector may crash when walking on the list head copy.	Story Points:	---
Clone Of:		Environment:
Last Closed:		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:	2266387
Bug Blocks:	2266369

Description Mauro Matteo Cascella 2024-02-27 18:05:05 UTC

In the Linux kernel, the following vulnerability has been resolved:

netfilter: nftables: clone set element expression template

The Linux kernel CVE team has assigned CVE-2021-46913 to this issue.

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024022708-CVE-2021-46913-eeef@gregkh/T/#u

Comment 1 Mauro Matteo Cascella 2024-02-27 18:05:39 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2266387]

Comment 4 Justin M. Forbes 2024-02-27 18:21:51 UTC

This was fixed for Fedora with the 5.11.16 stable kernel update.

Comment 15 Alex 2024-06-09 15:19:18 UTC

The result of automatic check (that is developed by Alexander Larkin) for this CVE-2021-46913 is: CHECK	Maybe valid. Check manually. with impact MODERATE (that is approximation based on flags REMOTE DANGER NOMEMCHK NETFILTER  ; these flags parsed automatically based on patche data). Such automatic check happens only for Low/Moderates (and only when not from reporter, but parsing already existing CVE). Highs always checked manually (I check it myself and then we check it again in Remediation team). In rare cases some of the Moderates could be increased to High later.