Bug 2253632 (CVE-2023-6622)

Summary:	CVE-2023-6622 kernel: null pointer dereference vulnerability in nft_dynset_init()
Product:	[Other] Security Response	Reporter:	Rohit Keshri <rkeshri>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	acaringi, allarkin, bhu, chwhite, cye, cyin, dbohanno, debarbos, dfreiber, dvlasenk, ezulian, hkrzesin, jarod, jburrell, jdenham, jfaracco, jforbes, jlelli, joe.lawrence, jshortt, jstancek, jwyatt, kcarcia, ldoskova, lgoncalv, lzampier, mstowell, nmurray, ptalbert, rogbas, rparrazo, rrobaina, rvrbovsk, rysulliv, scweaver, 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 null pointer dereference vulnerability was found in nft_dynset_init() in net/netfilter/nft_dynset.c in nf_tables in the Linux kernel. This issue may allow a local attacker with CAP_NET_ADMIN user privilege to trigger a denial of service.	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:	2253633
Bug Blocks:	2253636

Description Rohit Keshri 2023-12-08 11:56:59 UTC

In nft_dynset_init(), dynset_expr->ops is checked against set->exprs[i]->ops at (0) and set->exprs[i] may be NULL here. if set->num_exprs == 1, which means set->exprs[1] is NULL, and i == 1, the check at (1) will be passed and set->exprs[1] will be accessed, causing a kernel crash.

Refer:
https://github.com/torvalds/linux/commit/3701cd390fd731ee7ae8b8006246c8db82c72bea

Comment 2 Rohit Keshri 2023-12-08 12:07:58 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2253633]

Comment 4 errata-xmlrpc 2024-04-30 10:14:26 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2024:2394 https://access.redhat.com/errata/RHSA-2024:2394

Comment 5 errata-xmlrpc 2024-05-22 09:15:01 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2024:2950 https://access.redhat.com/errata/RHSA-2024:2950

Comment 6 errata-xmlrpc 2024-05-22 09:52:19 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2024:3138 https://access.redhat.com/errata/RHSA-2024:3138