Upstream information

CVE-2019-19578 at MITRE

Description

An issue was discovered in Xen through 4.12.x allowing x86 PV guest OS users to cause a denial of service via degenerate chains of linear pagetables, because of an incorrect fix for CVE-2017-15595. "Linear pagetables" is a technique which involves either pointing a pagetable at itself, or to another pagetable of the same or higher level. Xen has limited support for linear pagetables: A page may either point to itself, or point to another pagetable of the same level (i.e., L2 to L2, L3 to L3, and so on). XSA-240 introduced an additional restriction that limited the "depth" of such chains by allowing pages to either *point to* other pages of the same level, or *be pointed to* by other pages of the same level, but not both. To implement this, we keep track of the number of outstanding times a page points to or is pointed to another page table, to prevent both from happening at the same time. Unfortunately, the original commit introducing this reset this count when resuming validation of a partially-validated pagetable, incorrectly dropping some "linear_pt_entry" counts. If an attacker could engineer such a situation to occur, they might be able to make loops or other arbitrary chains of linear pagetables, as described in XSA-240. A malicious or buggy PV guest may cause the hypervisor to crash, resulting in Denial of Service (DoS) affecting the entire host. Privilege escalation and information leaks cannot be excluded. All versions of Xen are vulnerable. Only x86 systems are affected. Arm systems are not affected. Only x86 PV guests can leverage the vulnerability. x86 HVM and PVH guests cannot leverage the vulnerability. Only systems which have enabled linear pagetables are vulnerable. Systems which have disabled linear pagetables, either by selecting CONFIG_PV_LINEAR_PT=n when building the hypervisor, or adding pv-linear-pt=false on the command-line, are not vulnerable.

SUSE information

Overall state of this security issue: Resolved

This issue is currently rated as having important severity.

CVSS v2 Scores
  National Vulnerability Database
Base Score 7.2
Vector AV:L/AC:L/Au:N/C:C/I:C/A:C
Access Vector Local
Access Complexity Low
Authentication None
Confidentiality Impact Complete
Integrity Impact Complete
Availability Impact Complete
CVSS v3 Scores
  National Vulnerability Database SUSE
Base Score 8.8 7.5
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
Access Vector Local Local
Access Complexity Low High
Privileges Required Low High
User Interaction None None
Scope Changed Changed
Confidentiality Impact High High
Integrity Impact High High
Availability Impact High High
CVSSv3 Version 3.1 3.1
SUSE Bugzilla entry: 1158005 [RESOLVED / FIXED]

SUSE Security Advisories:

List of released packages

Product(s) Fixed package version(s) References
HPE Helion Openstack 8
  • xen >= 4.9.4_06-3.62.1
  • xen-doc-html >= 4.9.4_06-3.62.1
  • xen-libs >= 4.9.4_06-3.62.1
  • xen-libs-32bit >= 4.9.4_06-3.62.1
  • xen-tools >= 4.9.4_06-3.62.1
  • xen-tools-domU >= 4.9.4_06-3.62.1
 Patchnames:
HPE-Helion-OpenStack-8-2019-3297
HPE-Helion-OpenStack-8-2020-1630
Image SLES15-EC2-CHOST-HVM-BYOS
  • xen-libs >= 4.10.4_08-3.28.1
  • xen-tools-domU >= 4.10.4_08-3.28.1
Image SLES15-SP1-CHOST-BYOS-EC2
  • xen-libs >= 4.12.1_06-3.9.1
  • xen-tools-domU >= 4.12.1_06-3.9.1
SUSE CaaS Platform 3.0
  • xen >= 4.9.4_06-3.59.1
  • xen-libs >= 4.9.4_06-3.59.1
  • xen-tools-domU >= 4.9.4_06-3.59.1
 Patchnames:
SUSE-CAASP-3.0-2019-3297
SUSE Enterprise Storage 5
  • xen >= 4.9.4_06-3.62.1
  • xen-doc-html >= 4.9.4_06-3.62.1
  • xen-libs >= 4.9.4_06-3.62.1
  • xen-libs-32bit >= 4.9.4_06-3.62.1
  • xen-tools >= 4.9.4_06-3.62.1
  • xen-tools-domU >= 4.9.4_06-3.62.1
 Patchnames:
SUSE-Storage-5-2019-3297
SUSE-Storage-5-2020-1630
SUSE Linux Enterprise Desktop 12 SP4
  • xen >= 4.11.3_02-2.20.1
  • xen-libs >= 4.11.3_02-2.20.1
  • xen-libs-32bit >= 4.11.3_02-2.20.1
 Patchnames:
SUSE-SLE-DESKTOP-12-SP4-2019-3310
SUSE Linux Enterprise Module for Basesystem 15 SP1
  • xen >= 4.12.1_06-3.9.1
  • xen-libs >= 4.12.1_06-3.9.1
  • xen-tools-domU >= 4.12.1_06-3.9.1
 Patchnames:
SUSE-SLE-Module-Basesystem-15-SP1-2019-3338
SUSE Linux Enterprise Module for Basesystem 15
  • xen >= 4.10.4_08-3.28.1
  • xen-libs >= 4.10.4_08-3.28.1
  • xen-tools-domU >= 4.10.4_08-3.28.1
 Patchnames:
SUSE-SLE-Module-Basesystem-15-2019-3309
SUSE Linux Enterprise Module for Open Buildservice Development Tools 15 SP1
  • xen >= 4.12.1_06-3.9.1
  • xen-devel >= 4.12.1_06-3.9.1
  • xen-doc-html >= 4.12.1_06-3.9.1
  • xen-libs >= 4.12.1_06-3.9.1
  • xen-libs-32bit >= 4.12.1_06-3.9.1
  • xen-tools >= 4.12.1_06-3.9.1
  • xen-tools-domU >= 4.12.1_06-3.9.1
 Patchnames:
SUSE-SLE-Module-Development-Tools-OBS-15-SP1-2019-3338
SUSE Linux Enterprise Module for Server Applications 15 SP1
  • xen >= 4.12.1_06-3.9.1
  • xen-devel >= 4.12.1_06-3.9.1
  • xen-tools >= 4.12.1_06-3.9.1
 Patchnames:
SUSE-SLE-Module-Server-Applications-15-SP1-2019-3338
SUSE Linux Enterprise Module for Server Applications 15
  • xen >= 4.10.4_08-3.28.1
  • xen-devel >= 4.10.4_08-3.28.1
  • xen-tools >= 4.10.4_08-3.28.1
 Patchnames:
SUSE-SLE-Module-Server-Applications-15-2019-3309
SUSE Linux Enterprise Point of Sale 12 SP2-CLIENT
  • xen >= 4.7.6_06-43.59.1
  • xen-doc-html >= 4.7.6_06-43.59.1
  • xen-libs >= 4.7.6_06-43.59.1
  • xen-libs-32bit >= 4.7.6_06-43.59.1
  • xen-tools >= 4.7.6_06-43.59.1
  • xen-tools-domU >= 4.7.6_06-43.59.1
 Patchnames:
SUSE-SLE-POS-12-SP2-CLIENT-2020-334
SUSE Linux Enterprise Server 11 SP4-LTSS
SUSE Linux Enterprise Server for SAP Applications 11 SP4-LTSS
  • xen >= 4.4.4_42-61.52.1
  • xen-doc-html >= 4.4.4_42-61.52.1
  • xen-kmp-default >= 4.4.4_42_3.0.101_108.114-61.52.1
  • xen-kmp-pae >= 4.4.4_42_3.0.101_108.114-61.52.1
  • xen-libs >= 4.4.4_42-61.52.1
  • xen-libs-32bit >= 4.4.4_42-61.52.1
  • xen-tools >= 4.4.4_42-61.52.1
  • xen-tools-domU >= 4.4.4_42-61.52.1
 Patchnames:
slessp4-xen-14444
SUSE Linux Enterprise Server 12 SP1-LTSS
SUSE Linux Enterprise Server for SAP Applications 12 SP1-LTSS
  • xen >= 4.5.5_28-22.64.1
  • xen-doc-html >= 4.5.5_28-22.64.1
  • xen-kmp-default >= 4.5.5_28_k3.12.74_60.64.124-22.64.1
  • xen-libs >= 4.5.5_28-22.64.1
  • xen-libs-32bit >= 4.5.5_28-22.64.1
  • xen-tools >= 4.5.5_28-22.64.1
  • xen-tools-domU >= 4.5.5_28-22.64.1
 Patchnames:
SUSE-SLE-SERVER-12-SP1-2020-388
SUSE Linux Enterprise Server 12 SP2-BCL
SUSE Linux Enterprise Server for SAP Applications 12 SP2-BCL
  • xen >= 4.7.6_06-43.59.1
  • xen-doc-html >= 4.7.6_06-43.59.1
  • xen-libs >= 4.7.6_06-43.59.1
  • xen-libs-32bit >= 4.7.6_06-43.59.1
  • xen-tools >= 4.7.6_06-43.59.1
  • xen-tools-domU >= 4.7.6_06-43.59.1
 Patchnames:
SUSE-SLE-SERVER-12-SP2-BCL-2020-334
SUSE Linux Enterprise Server 12 SP2-ESPOS
SUSE Linux Enterprise Server for SAP Applications 12 SP2-ESPOS
  • xen >= 4.7.6_06-43.59.1
  • xen-doc-html >= 4.7.6_06-43.59.1
  • xen-libs >= 4.7.6_06-43.59.1
  • xen-libs-32bit >= 4.7.6_06-43.59.1
  • xen-tools >= 4.7.6_06-43.59.1
  • xen-tools-domU >= 4.7.6_06-43.59.1
 Patchnames:
SUSE-SLE-SERVER-12-SP2-ESPOS-2020-334
SUSE Linux Enterprise Server 12 SP2-LTSS
SUSE Linux Enterprise Server for SAP Applications 12 SP2-LTSS
  • xen >= 4.7.6_06-43.59.1
  • xen-doc-html >= 4.7.6_06-43.59.1
  • xen-libs >= 4.7.6_06-43.59.1
  • xen-libs-32bit >= 4.7.6_06-43.59.1
  • xen-tools >= 4.7.6_06-43.59.1
  • xen-tools-domU >= 4.7.6_06-43.59.1
 Patchnames:
SUSE-SLE-SERVER-12-SP2-2020-334
SUSE Linux Enterprise Server 12 SP3-BCL
SUSE Linux Enterprise Server for SAP Applications 12 SP3-BCL
  • xen >= 4.9.4_06-3.62.1
  • xen-doc-html >= 4.9.4_06-3.62.1
  • xen-libs >= 4.9.4_06-3.62.1
  • xen-libs-32bit >= 4.9.4_06-3.62.1
  • xen-tools >= 4.9.4_06-3.62.1
  • xen-tools-domU >= 4.9.4_06-3.62.1
 Patchnames:
SUSE-SLE-SERVER-12-SP3-BCL-2019-3297
SUSE-SLE-SERVER-12-SP3-BCL-2020-1630
SUSE Linux Enterprise Server 12 SP3-ESPOS
SUSE Linux Enterprise Server for SAP Applications 12 SP3-ESPOS
  • xen >= 4.9.4_06-3.62.1
  • xen-doc-html >= 4.9.4_06-3.62.1
  • xen-libs >= 4.9.4_06-3.62.1
  • xen-libs-32bit >= 4.9.4_06-3.62.1
  • xen-tools >= 4.9.4_06-3.62.1
  • xen-tools-domU >= 4.9.4_06-3.62.1
 Patchnames:
SUSE-SLE-SERVER-12-SP3-ESPOS-2019-3297
SUSE-SLE-SERVER-12-SP3-ESPOS-2020-1630
SUSE Linux Enterprise Server 12 SP3-LTSS
SUSE Linux Enterprise Server for SAP Applications 12 SP3-LTSS
  • xen >= 4.9.4_06-3.62.1
  • xen-doc-html >= 4.9.4_06-3.62.1
  • xen-libs >= 4.9.4_06-3.62.1
  • xen-libs-32bit >= 4.9.4_06-3.62.1
  • xen-tools >= 4.9.4_06-3.62.1
  • xen-tools-domU >= 4.9.4_06-3.62.1
 Patchnames:
SUSE-SLE-SERVER-12-SP3-2019-3297
SUSE-SLE-SERVER-12-SP3-2020-1630
SUSE Linux Enterprise Server 12 SP4
SUSE Linux Enterprise Server for SAP Applications 12 SP4
  • xen >= 4.11.3_02-2.20.1
  • xen-doc-html >= 4.11.3_02-2.20.1
  • xen-libs >= 4.11.3_02-2.20.1
  • xen-libs-32bit >= 4.11.3_02-2.20.1
  • xen-tools >= 4.11.3_02-2.20.1
  • xen-tools-domU >= 4.11.3_02-2.20.1
 Patchnames:
SUSE-SLE-SERVER-12-SP4-2019-3310
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server for SAP Applications 12 SP5
  • xen >= 4.12.1_10-3.8.1
  • xen-doc-html >= 4.12.1_10-3.8.1
  • xen-libs >= 4.12.1_10-3.8.1
  • xen-libs-32bit >= 4.12.1_10-3.8.1
  • xen-tools >= 4.12.1_10-3.8.1
  • xen-tools-domU >= 4.12.1_10-3.8.1
 Patchnames:
SUSE-SLE-SERVER-12-SP5-2019-3296
SUSE Linux Enterprise Server for SAP Applications 12 SP1
  • xen >= 4.5.5_28-22.64.1
  • xen-doc-html >= 4.5.5_28-22.64.1
  • xen-kmp-default >= 4.5.5_28_k3.12.74_60.64.124-22.64.1
  • xen-libs >= 4.5.5_28-22.64.1
  • xen-libs-32bit >= 4.5.5_28-22.64.1
  • xen-tools >= 4.5.5_28-22.64.1
  • xen-tools-domU >= 4.5.5_28-22.64.1
 Patchnames:
SUSE-SLE-SAP-12-SP1-2020-388
SUSE Linux Enterprise Server for SAP Applications 12 SP2
  • xen >= 4.7.6_06-43.59.1
  • xen-doc-html >= 4.7.6_06-43.59.1
  • xen-libs >= 4.7.6_06-43.59.1
  • xen-libs-32bit >= 4.7.6_06-43.59.1
  • xen-tools >= 4.7.6_06-43.59.1
  • xen-tools-domU >= 4.7.6_06-43.59.1
 Patchnames:
SUSE-SLE-SAP-12-SP2-2020-334
SUSE Linux Enterprise Server for SAP Applications 12 SP3
  • xen >= 4.9.4_06-3.62.1
  • xen-doc-html >= 4.9.4_06-3.62.1
  • xen-libs >= 4.9.4_06-3.62.1
  • xen-libs-32bit >= 4.9.4_06-3.62.1
  • xen-tools >= 4.9.4_06-3.62.1
  • xen-tools-domU >= 4.9.4_06-3.62.1
 Patchnames:
SUSE-SLE-SAP-12-SP3-2019-3297
SUSE-SLE-SAP-12-SP3-2020-1630
SUSE Linux Enterprise Software Development Kit 12 SP4
  • xen >= 4.11.3_02-2.20.1
  • xen-devel >= 4.11.3_02-2.20.1
 Patchnames:
SUSE-SLE-SDK-12-SP4-2019-3310
SUSE Linux Enterprise Software Development Kit 12 SP5
  • xen >= 4.12.1_10-3.8.1
  • xen-devel >= 4.12.1_10-3.8.1
 Patchnames:
SUSE-SLE-SDK-12-SP5-2019-3296
SUSE OpenStack Cloud 7
  • xen >= 4.7.6_06-43.59.1
  • xen-doc-html >= 4.7.6_06-43.59.1
  • xen-libs >= 4.7.6_06-43.59.1
  • xen-libs-32bit >= 4.7.6_06-43.59.1
  • xen-tools >= 4.7.6_06-43.59.1
  • xen-tools-domU >= 4.7.6_06-43.59.1
 Patchnames:
SUSE-OpenStack-Cloud-7-2020-334
SUSE OpenStack Cloud 8
  • xen >= 4.9.4_06-3.62.1
  • xen-doc-html >= 4.9.4_06-3.62.1
  • xen-libs >= 4.9.4_06-3.62.1
  • xen-libs-32bit >= 4.9.4_06-3.62.1
  • xen-tools >= 4.9.4_06-3.62.1
  • xen-tools-domU >= 4.9.4_06-3.62.1
 Patchnames:
SUSE-OpenStack-Cloud-8-2019-3297
SUSE-OpenStack-Cloud-8-2020-1630
SUSE OpenStack Cloud Crowbar 8
  • xen >= 4.9.4_06-3.62.1
  • xen-doc-html >= 4.9.4_06-3.62.1
  • xen-libs >= 4.9.4_06-3.62.1
  • xen-libs-32bit >= 4.9.4_06-3.62.1
  • xen-tools >= 4.9.4_06-3.62.1
  • xen-tools-domU >= 4.9.4_06-3.62.1
 Patchnames:
SUSE-OpenStack-Cloud-Crowbar-8-2019-3297
SUSE-OpenStack-Cloud-Crowbar-8-2020-1630
openSUSE Leap 15.1
  • xen >= 4.12.1_06-lp151.2.9.1
  • xen-debugsource >= 4.12.1_06-lp151.2.9.1
  • xen-devel >= 4.12.1_06-lp151.2.9.1
  • xen-doc-html >= 4.12.1_06-lp151.2.9.1
  • xen-libs >= 4.12.1_06-lp151.2.9.1
  • xen-libs-32bit >= 4.12.1_06-lp151.2.9.1
  • xen-libs-32bit-debuginfo >= 4.12.1_06-lp151.2.9.1
  • xen-libs-debuginfo >= 4.12.1_06-lp151.2.9.1
  • xen-tools >= 4.12.1_06-lp151.2.9.1
  • xen-tools-debuginfo >= 4.12.1_06-lp151.2.9.1
  • xen-tools-domU >= 4.12.1_06-lp151.2.9.1
  • xen-tools-domU-debuginfo >= 4.12.1_06-lp151.2.9.1
 Patchnames:
openSUSE-2020-11

Status of this issue by product and package

Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification.

Product(s) Source package State
SUSE CaaS Platform 3.0 xen Released
SUSE Container as a Service Platform 1.0 xen Unsupported
SUSE Container as a Service Platform 2.0 xen Unsupported
SUSE Linux Enterprise 15 Module for Basesystem xen Released
SUSE Linux Enterprise 15 Module for Server Applications xen Released
SUSE Linux Enterprise 15-SP1 Module for Basesystem xen Released
SUSE Linux Enterprise 15-SP1 Module for Server Applications xen Released
SUSE Linux Enterprise Desktop 12 SP4 xen Released
SUSE Linux Enterprise High Performance Computing 12 SP4 xen Released
SUSE Linux Enterprise High Performance Computing 12 SP5 xen Released
SUSE Linux Enterprise Server 11 SP4 LTSS xen Released
SUSE Linux Enterprise Server 12 SP1 LTSS xen Released
SUSE Linux Enterprise Server 12 SP2 LTSS xen Released
SUSE Linux Enterprise Server 12 SP3 BCL xen Released
SUSE Linux Enterprise Server 12 SP3 LTSS xen Released
SUSE Linux Enterprise Server 12 SP4 xen Released
SUSE Linux Enterprise Server 12 SP5 xen Released
SUSE Linux Enterprise Server for SAP Applications 12 SP2 xen Released
SUSE Linux Enterprise Server for SAP Applications 12 SP3 xen Released
SUSE Linux Enterprise Server for SAP Applications 12 SP4 xen Released
SUSE Linux Enterprise Server for SAP Applications 12 SP5 xen Released
SUSE Linux Enterprise Software Development Kit 12 SP4 xen Released
SUSE Linux Enterprise Software Development Kit 12 SP5 xen Released