Bug 2282413 (CVE-2021-47343)

Summary:	CVE-2021-47343 kernel: dm btree remove: assign new_root only when removal succeeds
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, bmarzins, chwhite, cye, cyin, dbohanno, debarbos, dfreiber, drow, dvlasenk, esandeen, ezulian, hkrzesin, jarod, jburrell, jdenham, jfaracco, jlelli, joe.lawrence, jshortt, jstancek, jwyatt, kcarcia, ldoskova, lgoncalv, mbenatto, 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 4.4.276, kernel 4.9.276, kernel 4.14.240, kernel 4.19.198, kernel 5.4.133, kernel 5.10.51, kernel 5.12.18, kernel 5.13.3, kernel 5.14	Doc Type:	If docs needed, set a value
Doc Text:	A vulnerability was found in the Linux kernel's device-mapper subsystem, where the dm_btree_remove function could assign an uninitialized value to new_root if a tree removal operation failed. This issue could result in reading invalid memory locations, leading to system instability or crashes.	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:	2282499

Description ybuenos 2024-05-22 11:23:49 UTC

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

dm btree remove: assign new_root only when removal succeeds

The Linux kernel CVE team has assigned CVE-2021-47343 to this issue.

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024052138-CVE-2021-47343-1974@gregkh/T

Comment 3 Alex 2024-06-09 15:39:05 UTC

The result of automatic check (that is developed by Alexander Larkin) for this CVE-2021-47343 is: CHECK	Maybe valid. Check manually. with impact MODERATE (that is approximation based on flags WRITE OOB  ; 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.