Bug 2271473 (CVE-2021-47159)

Summary:	CVE-2021-47159 kernel: net: dsa: fix a crash if ->get_sset_count() fails
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, jlelli, joe.lawrence, jshortt, jstancek, jwyatt, kcarcia, ldoskova, lgoncalv, lzampier, mleitner, mmilgram, mstowell, nmurray, ptalbert, rparrazo, rrobaina, rvrbovsk, scweaver, sidakwo, sukulkar, tglozar, vkumar, wcosta, williams, wmealing, ycote, ykopkova, zhijwang
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	kernel 4.19.193, kernel 5.4.124, kernel 5.10.42, kernel 5.12.9, kernel 5.13	Doc Type:	If docs needed, set a value
Doc Text:	A vulnerability was discovered in the Linux kernel's DSA (Distributed Switch Architecture) module, specifically when handling failures in the get_sset_count() function pointer. If this function fails, causing an error code like -EOPNOTSUPP, it results in an unsigned int variable 'i' being type-promoted to a large value. Subsequently, this can lead to memory corruption and system crashes due to uncontrolled loop behavior. The issue was addressed by implementing error code checks and converting 'i' to an int type to prevent such memory corruption scenarios.	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:
Bug Blocks:	2271579

Description Mauro Matteo Cascella 2024-03-25 17:42:47 UTC

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

net: dsa: fix a crash if -&gt;get_sset_count() fails

The Linux kernel CVE team has assigned CVE-2021-47159 to this issue.

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024032533-CVE-2021-47159-9ac6@gregkh/T

Comment 1 Alex 2024-06-09 13:13:25 UTC

The result of automatic check (that is developed by Alexander Larkin) for this CVE-2021-47159 is: 	SKIP	No affected files built, so skip this CVE	NO			-	-	unknown (where first YES/NO value means if related sources built).