Bug 2282351 (CVE-2021-47389)

Summary:	CVE-2021-47389 kernel: KVM: SVM: fix missing sev_decommission in sev_receive_start
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 5.14.10, kernel 5.15	Doc Type:	If docs needed, set a value
Doc Text:	A vulnerability was found in the Linux kernel’s KVM SVM implementation where the sev_receive_start() function fails to properly decommission the SEV context when binding an ASID fails, which leads to memory leaks and potential failures in subsequent SEV launches due to exhaustion of available SEV guest contexts.	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 09:03:09 UTC

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

KVM: SVM: fix missing sev_decommission in sev_receive_start

The Linux kernel CVE team has assigned CVE-2021-47389 to this issue.

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024052145-CVE-2021-47389-c01c@gregkh/T

Comment 2 Alex 2024-06-09 17:35:11 UTC

The result of automatic check (that is developed by Alexander Larkin) for this CVE-2021-47389 is: CHECK	Maybe valid. Check manually. with impact LOW (that is an approximation based on flags VIRT LEAK  ; 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.