Bug 2266499 (CVE-2021-46938)

Summary:	CVE-2021-46938 kernel: dm rq: fix double free of blk_mq_tag_set in dev remove after table load fails
Product:	[Other] Security Response	Reporter:	Nick Tait <ntait>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	acaringi, allarkin, aquini, bhu, chwhite, cye, cyin, dbohanno, debarbos, dfreiber, drow, dvlasenk, esandeen, ezulian, hkrzesin, jarod, jburrell, jdenham, jfaracco, jforbes, jlelli, joe.lawrence, jshortt, jstancek, jwyatt, kcarcia, ldoskova, lgoncalv, lzampier, mleitner, mmilgram, mstowell, nmurray, ptalbert, rparrazo, rrobaina, rvrbovsk, rysulliv, scweaver, sukulkar, 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:		Story Points:	---
Clone Of:		Environment:
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Regression:	---	Mount Type:	---
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Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2266500
Bug Blocks:	2266459

Description Nick Tait 2024-02-27 23:43:56 UTC

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

dm rq: fix double free of blk_mq_tag_set in dev remove after table load fails

The Linux kernel CVE team has assigned CVE-2021-46938 to this issue.

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/20240227184057.2368370-3-gregkh@linuxfoundation.org/T/#u

Comment 1 Nick Tait 2024-02-27 23:44:31 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2266500]

Comment 6 Justin M. Forbes 2024-02-28 18:55:04 UTC

This was fixed for Fedora with the 5.12.3 stable kernel update.

Comment 8 Alex 2024-06-09 16:45:56 UTC

The result of automatic check (that is developed by Alexander Larkin) for this CVE-2021-46938 is: CHECK	Maybe valid. Check manually. with impact LOW (that is an approximation based on flags DANGER INIT  ; 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.