Bug 1929550 (CVE-2021-26931)

Summary:	CVE-2021-26931 xen: Linux: backends treating grant mapping errors as bugs
Product:	[Other] Security Response	Reporter:	msiddiqu
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
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 07:02:26 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:	1929551
Bug Blocks:	1924847

Description msiddiqu 2021-02-17 06:17:43 UTC

Block, net, and SCSI backends consider certain errors a plain bug,
deliberately causing a kernel crash.  For errors potentially being at
least under the influence of guests, like out of memory conditions, it
isn't correct to assume so.  Memory allocations potentially causing
such crashes occur only when Linux is running in PV mode, though.

External References:

https://xenbits.xen.org/xsa/advisory-362.html

Comment 1 msiddiqu 2021-02-17 06:18:02 UTC

Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1929551]

Comment 2 Product Security DevOps Team 2021-02-17 07:02:26 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.