Bug 2248189 (CVE-2023-5972)

Summary:	CVE-2023-5972 kernel: The NFTA_INNER_NUM and NFTA_EXPR_NAME netlink attributes accessed without checking its presence in nft_inner.c
Product:	[Other] Security Response	Reporter:	Alex <allarkin>
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, drow, dvlasenk, ezulian, hkrzesin, jarod, jburrell, jdenham, jfaracco, jforbes, jlelli, joe.lawrence, jpoimboe, jshortt, jstancek, jwyatt, kcarcia, ldoskova, lgoncalv, lzampier, mstowell, nmurray, ptalbert, rogbas, rparrazo, rrobaina, rvrbovsk, rysulliv, scweaver, security-response-team, 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 flaw was found in the nft_inner.c functionality of netfilter in the Linux kernel. This issue could allow a local user to crash the system or escalate their privileges on the system.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
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Documentation:	---	CRM:
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2251249
Bug Blocks:	2248168

Description Alex 2023-11-06 19:19:26 UTC

Two similar flaws in the Linux Kernel found.
From v6.2-rc1 to v6.6-rc6two null pointer dereference vulnerabilities in nf_tables could happen.
The first vulnerability is in nft_inner_init() in nft_inner.c.
The NFTA_INNER_NUM netlink attribute is accessed At (0) without checking its presence before, so it may be NULL。
The second vulnerability is in nft_expr_inner_parse(), which is quite similar to the first one.
The NFTA_EXPR_NAME netlink attribute is not checked before accessing it.

Comment 2 Alex 2023-11-23 15:29:40 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2251249]

Comment 3 Justin M. Forbes 2023-11-28 18:15:30 UTC

This was fixed for Fedora with the 6.5.9 stable kernel updates.