Bug 1905675 (CVE-2020-29570)

Summary:	CVE-2020-29570 xen: FIFO event channels control block related ordering (XSA-358)
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	jforbes, m.a.young, robinlee.sysu, security-response-team
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:
Last Closed:	2020-12-15 22:20:12 UTC	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:	1907931
Bug Blocks:	1903644

Description Guilherme de Almeida Suckevicz 2020-12-08 19:40:54 UTC

Recording of the per-vCPU control block mapping maintained by Xen and
that of pointers into the control block is reversed.  The consumer
assumes, seeing the former initialized, that the latter are also ready
for use.

Comment 1 Guilherme de Almeida Suckevicz 2020-12-15 14:31:38 UTC

Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1907931]

Comment 2 Guilherme de Almeida Suckevicz 2020-12-15 16:25:41 UTC

External References:

https://www.openwall.com/lists/oss-security/2020/12/15/14

Comment 3 Product Security DevOps Team 2020-12-15 22:20:12 UTC

This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.