Bug 2267016 (CVE-2021-47049)

Summary:	CVE-2021-47049 kernel: Drivers: hv: vmbus: Use after free in __vmbus_open()
Product:	[Other] Security Response	Reporter:	Avinash Hanwate <ahanwate>
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, sidakwo, sukulkar, tglozar, tyberry, vkumar, wcosta, williams, wmealing, ycote, ykopkova, zhijwang
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	kernel 5.10.37, kernel 5.11.21, kernel 5.12.4, kernel 5.13	Doc Type:	If docs needed, set a value
Doc Text:		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:	2267017
Bug Blocks:	2267020

Description Avinash Hanwate 2024-02-29 10:39:41 UTC

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

Drivers: hv: vmbus: Use after free in __vmbus_open()

The Linux kernel CVE team has assigned CVE-2021-47049 to this issue.

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024022840-CVE-2021-47049-5cc6@gregkh/T/#u

Comment 1 Avinash Hanwate 2024-02-29 10:40:24 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2267017]

Comment 2 Justin M. Forbes 2024-02-29 17:30:48 UTC

This was fixed for Fedora with the 5.12.4 stable kernel updates.

Comment 3 Alex 2024-06-09 16:21:45 UTC

The result of automatic check (that is developed by Alexander Larkin) for this CVE-2021-47049 is: CHECK	Maybe valid. Check manually. with impact LOW (that is an approximation based on flags INIT SIMPLEFIX UAF  ; 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.