Bug 1214083

Summary:	VUL-0: CVE-2022-40982: xen: x86/Intel: Gather Data Sampling (XSA-435)
Product:	[Novell Products] SUSE Security Incidents	Reporter:	Carlos López <carlos.lopez>
Component:	Incidents	Assignee:	Security Team bot <security-team>
Status:	RESOLVED FIXED	QA Contact:	Security Team bot <security-team>
Severity:	Normal
Priority:	P3 - Medium	CC:	carnold, jbeulich, jkosina, jslaby, meissner, mhocko, nik.borisov, rfrohl, security-team, vbabka
Version:	unspecified
Target Milestone:	---
Hardware:	Other
OS:	Other
URL:	https://smash.suse.de/issue/350726/
Whiteboard:
Found By:	---	Services Priority:
Business Priority:		Blocker:	---
Marketing QA Status:	---	IT Deployment:	---
Bug Depends on:	1206418
Bug Blocks:

Description Carlos López 2023-08-08 19:34:56 UTC

+++ This bug was initially created as a clone of Bug #1206418 +++

            Xen Security Advisory CVE-2022-40982 / XSA-435

                    x86/Intel: Gather Data Sampling

ISSUE DESCRIPTION
=================

A researcher has discovered Gather Data Sampling, a transient execution
side-channel whereby the AVX GATHER instructions can forward the content
of stale vector registers to dependent instructions.

The physical register file is a structure competitively shared between
sibling threads.  Therefore an attacker can infer data from the sibling
thread, or from a more privileged context.

For more details, see:
  https://www.intel.com/content/www/us/en/developer/articles/technical/software-security-guidance/technical-documentation/gather-data-sampling.html

IMPACT
======

An attacker can infer data from different contexts on the same core.
Examples of such data includes key material, cipher and plaintext from
the AES-NI instructions, or the contents of REP-MOVS instructions,
commonly used to implement memcpy().

VULNERABLE SYSTEMS
==================

Systems running all versions of Xen are affected.

See the Intel documentation for a list of affected processors.

CPUs from other hardware vendors are not believed to be affected.

MITIGATION
==========

This issue can be mitigated by disabling AVX, either by booting Xen with
`cpuid=no-avx` on the command line, or by specifying `cpuid="host:avx=0"`
in the vm.cfg file of all untrusted VMs.  However, this may come with a
significant performance impact on the system and is not recommended for
anyone able to deploy the microcode and patch described below.

RESOLUTION
==========

Intel are producing microcode updates to address the issue for most
affected CPUs.  Consult your dom0 OS vendor.  This microcode is
effective when late-loaded, which can be performed on a live system
without reboot.

Without microcode, disabling AVX is the only mitigation.  This is
implemented by the patches to Xen on hardware believed to be vulnerable.

In addition, to indicate safety to guest kernels, Xen needs to
synthesise new bits for guests to see, which depends on MSR_ARCH_CAPS
being visible to guests.  The work to support MSR_ARCH_CAPS is extensive
and has been going on in public in earnest since March.  The backports
to security trees are more-extensive still.

Therefore, we have decided to produce new releases on all stable trees.
Please find fixes in the respective branches under the following release
tags:

  RELEASE-4.17.2
  RELEASE-4.16.5
  RELEASE-4.15.5
  RELEASE-4.14.6

Other release activities (tarballs, announcements, etc) will happen in
due course.

Comment 1 Jan Beulich 2023-08-09 06:11:51 UTC

(In reply to Carlos López from comment #0)
> MITIGATION
> ==========
> 
> This issue can be mitigated by disabling AVX, either by booting Xen with
> `cpuid=no-avx` on the command line, or by specifying `cpuid="host:avx=0"`
> in the vm.cfg file of all untrusted VMs.  However, this may come with a
> significant performance impact on the system and is not recommended for
> anyone able to deploy the microcode and patch described below.

Just to not forget mentioning it (in case any of this is used to communicate to our customers, in particular LTSS ones): On older Xen no such "cpuid=" workaround exists. I think there xsave would need disabling altogether instead.

Comment 3 Maintenance Automation 2023-08-23 20:30:32 UTC

SUSE-SU-2023:3395-1: An update that solves three vulnerabilities and has one fix can now be installed.

Category: security (moderate)
Bug References: 1027519, 1213616, 1214082, 1214083
CVE References: CVE-2022-40982, CVE-2023-20569, CVE-2023-20593
Sources used:
openSUSE Leap 15.4 (src): xen-4.16.5_02-150400.4.31.1
openSUSE Leap Micro 5.3 (src): xen-4.16.5_02-150400.4.31.1
openSUSE Leap Micro 5.4 (src): xen-4.16.5_02-150400.4.31.1
SUSE Linux Enterprise Micro for Rancher 5.3 (src): xen-4.16.5_02-150400.4.31.1
SUSE Linux Enterprise Micro 5.3 (src): xen-4.16.5_02-150400.4.31.1
SUSE Linux Enterprise Micro for Rancher 5.4 (src): xen-4.16.5_02-150400.4.31.1
SUSE Linux Enterprise Micro 5.4 (src): xen-4.16.5_02-150400.4.31.1
Basesystem Module 15-SP4 (src): xen-4.16.5_02-150400.4.31.1
Server Applications Module 15-SP4 (src): xen-4.16.5_02-150400.4.31.1

NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.

Comment 5 Maintenance Automation 2023-08-28 12:30:25 UTC

SUSE-SU-2023:3447-1: An update that solves three vulnerabilities and has two fixes can now be installed.

Category: security (moderate)
Bug References: 1027519, 1212684, 1213616, 1214082, 1214083
CVE References: CVE-2022-40982, CVE-2023-20569, CVE-2023-20593
Sources used:
Server Applications Module 15-SP5 (src): xen-4.17.2_02-150500.3.6.1
openSUSE Leap 15.5 (src): xen-4.17.2_02-150500.3.6.1
Basesystem Module 15-SP5 (src): xen-4.17.2_02-150500.3.6.1

NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.

Comment 6 Maintenance Automation 2023-08-28 12:30:30 UTC

SUSE-SU-2023:3446-1: An update that solves three vulnerabilities and has two fixes can now be installed.

Category: security (moderate)
Bug References: 1027519, 1204489, 1213616, 1214082, 1214083
CVE References: CVE-2022-40982, CVE-2023-20569, CVE-2023-20593
Sources used:
SUSE Manager Proxy 4.2 (src): xen-4.14.6_02-150300.3.51.1
SUSE Manager Retail Branch Server 4.2 (src): xen-4.14.6_02-150300.3.51.1
SUSE Manager Server 4.2 (src): xen-4.14.6_02-150300.3.51.1
SUSE Linux Enterprise Micro 5.1 (src): xen-4.14.6_02-150300.3.51.1
SUSE Linux Enterprise Micro 5.2 (src): xen-4.14.6_02-150300.3.51.1
SUSE Linux Enterprise Micro for Rancher 5.2 (src): xen-4.14.6_02-150300.3.51.1

NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.

Comment 7 Maintenance Automation 2023-08-30 20:30:06 UTC

SUSE-SU-2023:3496-1: An update that solves three vulnerabilities and has one fix can now be installed.

Category: security (important)
Bug References: 1027519, 1213616, 1214082, 1214083
CVE References: CVE-2022-40982, CVE-2023-20569, CVE-2023-20593
Sources used:
SUSE Linux Enterprise High Performance Computing 15 SP2 LTSS 15-SP2 (src): xen-4.13.5_02-150200.3.74.1
SUSE Linux Enterprise Server 15 SP2 LTSS 15-SP2 (src): xen-4.13.5_02-150200.3.74.1
SUSE Linux Enterprise Server for SAP Applications 15 SP2 (src): xen-4.13.5_02-150200.3.74.1
SUSE Enterprise Storage 7 (src): xen-4.13.5_02-150200.3.74.1

NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.

Comment 8 Maintenance Automation 2023-08-30 20:30:09 UTC

SUSE-SU-2023:3495-1: An update that solves three vulnerabilities can now be installed.

Category: security (important)
Bug References: 1213616, 1214082, 1214083
CVE References: CVE-2022-40982, CVE-2023-20569, CVE-2023-20593
Sources used:
SUSE Linux Enterprise Software Development Kit 12 SP5 (src): xen-4.12.4_36-3.91.2
SUSE Linux Enterprise Server for SAP Applications 12 SP5 (src): xen-4.12.4_36-3.91.2
SUSE Linux Enterprise High Performance Computing 12 SP5 (src): xen-4.12.4_36-3.91.2
SUSE Linux Enterprise Server 12 SP5 (src): xen-4.12.4_36-3.91.2

NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.

Comment 9 Maintenance Automation 2023-08-30 20:30:12 UTC

SUSE-SU-2023:3494-1: An update that solves three vulnerabilities can now be installed.

Category: security (important)
Bug References: 1213616, 1214082, 1214083
CVE References: CVE-2022-40982, CVE-2023-20569, CVE-2023-20593
Sources used:
SUSE Linux Enterprise High Performance Computing 15 SP1 LTSS 15-SP1 (src): xen-4.12.4_36-150100.3.89.1
SUSE Linux Enterprise Server 15 SP1 LTSS 15-SP1 (src): xen-4.12.4_36-150100.3.89.1
SUSE Linux Enterprise Server for SAP Applications 15 SP1 (src): xen-4.12.4_36-150100.3.89.1
SUSE CaaS Platform 4.0 (src): xen-4.12.4_36-150100.3.89.1

NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.

Comment 13 Maintenance Automation 2023-09-29 12:30:13 UTC

SUSE-SU-2023:3895-1: An update that solves four vulnerabilities can now be installed.

Category: security (important)
Bug References: 1213616, 1214083, 1215145, 1215474
CVE References: CVE-2022-40982, CVE-2023-20588, CVE-2023-20593, CVE-2023-34322
Sources used:
SUSE Linux Enterprise High Performance Computing 15 SP2 LTSS 15-SP2 (src): xen-4.13.5_04-150200.3.77.1
SUSE Linux Enterprise Server 15 SP2 LTSS 15-SP2 (src): xen-4.13.5_04-150200.3.77.1
SUSE Linux Enterprise Server for SAP Applications 15 SP2 (src): xen-4.13.5_04-150200.3.77.1

NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.

Comment 14 Maintenance Automation 2023-09-29 12:30:16 UTC

SUSE-SU-2023:3894-1: An update that solves four vulnerabilities can now be installed.

Category: security (important)
Bug References: 1213616, 1214083, 1215145, 1215474
CVE References: CVE-2022-40982, CVE-2023-20588, CVE-2023-20593, CVE-2023-34322
Sources used:
SUSE Linux Enterprise Software Development Kit 12 SP5 (src): xen-4.12.4_38-3.94.1
SUSE Linux Enterprise Server for SAP Applications 12 SP5 (src): xen-4.12.4_38-3.94.1
SUSE Linux Enterprise High Performance Computing 12 SP5 (src): xen-4.12.4_38-3.94.1
SUSE Linux Enterprise Server 12 SP5 (src): xen-4.12.4_38-3.94.1

NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.

Comment 15 Maintenance Automation 2023-09-29 16:30:06 UTC

SUSE-SU-2023:3902-1: An update that solves four vulnerabilities can now be installed.

Category: security (important)
Bug References: 1213616, 1214083, 1215145, 1215474
CVE References: CVE-2022-40982, CVE-2023-20588, CVE-2023-20593, CVE-2023-34322
Sources used:
SUSE Linux Enterprise High Performance Computing 15 SP1 LTSS 15-SP1 (src): xen-4.12.4_38-150100.3.92.1
SUSE Linux Enterprise Server 15 SP1 LTSS 15-SP1 (src): xen-4.12.4_38-150100.3.92.1
SUSE Linux Enterprise Server for SAP Applications 15 SP1 (src): xen-4.12.4_38-150100.3.92.1
SUSE CaaS Platform 4.0 (src): xen-4.12.4_38-150100.3.92.1

NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.

Comment 16 Charles Arnold 2023-10-25 20:03:43 UTC

Submission done.

Comment 18 Robert Frohl 2024-05-23 08:33:20 UTC

done, closing

Comment 19 Maintenance Automation 2024-07-16 16:30:09 UTC

SUSE-SU-2024:2535-1: An update that solves six vulnerabilities and has one security fix can now be installed.

Category: security (important)
Bug References: 1214083, 1221332, 1221334, 1221984, 1222302, 1222453, 1227355
CVE References: CVE-2023-28746, CVE-2023-46842, CVE-2024-2193, CVE-2024-2201, CVE-2024-31142, CVE-2024-31143
Maintenance Incident: [SUSE:Maintenance:33138](https://smelt.suse.de/incident/33138/)
Sources used:
SUSE Linux Enterprise High Performance Computing 15 SP2 LTSS 15-SP2 (src):
 xen-4.13.5_12-150200.3.93.1
SUSE Linux Enterprise Server 15 SP2 LTSS 15-SP2 (src):
 xen-4.13.5_12-150200.3.93.1
SUSE Linux Enterprise Server for SAP Applications 15 SP2 (src):
 xen-4.13.5_12-150200.3.93.1

NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.