Bug 2282340 (CVE-2021-47397)

Summary:	CVE-2021-47397 kernel: sctp: break out if skb_header_pointer returns NULL in sctp_rcv_ootb
Product:	[Other] Security Response	Reporter:	ybuenos
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, rkeshri, 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 4.14.249, kernel 4.19.209, kernel 5.4.151, kernel 5.10.71, kernel 5.14.10, kernel 5.15	Doc Type:	If docs needed, set a value
Doc Text:	A vulnerability was found in Linux kernel's SCTP implementation, where the sctp_rcv_ootb function does not properly validate the return value of skb_header_pointer, resulting in potential system crashes when processing SCTP packets.	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:	2282406

Description ybuenos 2024-05-22 08:50:09 UTC

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

sctp: break out if skb_header_pointer returns NULL in sctp_rcv_ootb

The Linux kernel CVE team has assigned CVE-2021-47397 to this issue.

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024052148-CVE-2021-47397-1b56@gregkh/T

Comment 2 Alex 2024-06-09 17:33:49 UTC

The result of automatic check (that is developed by Alexander Larkin) for this CVE-2021-47397 is: CHECK	Maybe valid. Check manually. with impact LOW (that is an approximation based on flags KASAN NULLPTR IMPROVEONLY  ; these flags parsed automatically based on patch 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.