Bug 1929544 (CVE-2021-26930)

Summary:	CVE-2021-26930 xen: Linux: error handling issues in blkback's grant mapping
Product:	[Other] Security Response	Reporter:	msiddiqu
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	jforbes, m.a.young, robinlee.sysu
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:	2021-02-17 07:02:17 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:	1929545
Bug Blocks:	1924847

Description msiddiqu 2021-02-17 06:16:27 UTC

To service requests, the driver maps grant references provided by the
frontend.  In this process, errors may be encountered.  In one case an
error encountered earlier might be discarded by later processing,
resulting in the caller assuming successful mapping, and hence
subsequent operations trying to access space that wasn't mapped.  In
another case internal state would be insufficiently updated, preventing
safe recovery from the error.

External References: 

https://xenbits.xen.org/xsa/advisory-365.html

Comment 1 msiddiqu 2021-02-17 06:16:47 UTC

Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1929545]

Comment 2 Product Security DevOps Team 2021-02-17 07:02:17 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.