Bug 1801083 (CVE-2019-19581)

Summary:	CVE-2019-19581 xen: bit iteration mishandling allows Arm guest OS users to cause a DoS
Product:	[Other] Security Response	Reporter:	Marian Rehak <mrehak>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	acaringi, ailan, bhu, brdeoliv, dhoward, drjones, dvlasenk, fhrbata, hkrzesin, imammedo, jforbes, jshortt, jstancek, knoel, m.a.young, mrezanin, nmurray, pbonzini, robinlee.sysu, rvrbovsk, vkuznets, xen-maint
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	No Doc Update
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-02-18 15:13:55 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:	1801084
Bug Blocks:	1801085

Description Marian Rehak 2020-02-10 08:39:54 UTC

An issue was discovered in Xen through 4.12.x allowing 32-bit Arm guest OS users to cause a DoS (out-of-bounds access) because certain bit iteration is mishandled. In a number of places bitmaps are being used by the hypervisor to track certain state. Iteration over all bits involves functions which may misbehave in certain corner cases. 64-bit Arm systems are not vulnerable.

External Reference:

https://xenbits.xen.org/xsa/advisory-307.html

Comment 1 Marian Rehak 2020-02-10 08:40:24 UTC

Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1801084]