Upstream information

CVE-2021-47277 at MITRE

Description

In the Linux kernel, the following vulnerability has been resolved: kvm: avoid speculation-based attacks from out-of-range memslot accesses KVM's mechanism for accessing guest memory translates a guest physical address (gpa) to a host virtual address using the right-shifted gpa (also known as gfn) and a struct kvm_memory_slot. The translation is performed in __gfn_to_hva_memslot using the following formula: hva = slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE It is expected that gfn falls within the boundaries of the guest's physical memory. However, a guest can access invalid physical addresses in such a way that the gfn is invalid. __gfn_to_hva_memslot is called from kvm_vcpu_gfn_to_hva_prot, which first retrieves a memslot through __gfn_to_memslot. While __gfn_to_memslot does check that the gfn falls within the boundaries of the guest's physical memory or not, a CPU can speculate the result of the check and continue execution speculatively using an illegal gfn. The speculation can result in calculating an out-of-bounds hva. If the resulting host virtual address is used to load another guest physical address, this is effectively a Spectre gadget consisting of two consecutive reads, the second of which is data dependent on the first. Right now it's not clear if there are any cases in which this is exploitable. One interesting case was reported by the original author of this patch, and involves visiting guest page tables on x86. Right now these are not vulnerable because the hva read goes through get_user(), which contains an LFENCE speculation barrier. However, there are patches in progress for x86 uaccess.h to mask kernel addresses instead of using LFENCE; once these land, a guest could use speculation to read from the VMM's ring 3 address space. Other architectures such as ARM already use the address masking method, and would be susceptible to this same kind of data-dependent access gadgets. Therefore, this patch proactively protects from these attacks by masking out-of-bounds gfns in __gfn_to_hva_memslot, which blocks speculation of invalid hvas. Sean Christopherson noted that this patch does not cover kvm_read_guest_offset_cached. This however is limited to a few bytes past the end of the cache, and therefore it is unlikely to be useful in the context of building a chain of data dependent accesses.

SUSE information

Overall state of this security issue: Pending

This issue is currently rated as having moderate severity.

CVSS v3 Scores
  SUSE
Base Score 5.5
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality Impact None
Integrity Impact None
Availability Impact High
CVSSv3 Version 3.1
SUSE Bugzilla entry: 1224960 [NEW]

SUSE Security Advisories:

List of released packages

Product(s) Fixed package version(s) References
SUSE Linux Enterprise High Availability Extension 12 SP5
  • cluster-md-kmp-default >= 4.12.14-122.219.1
  • dlm-kmp-default >= 4.12.14-122.219.1
  • gfs2-kmp-default >= 4.12.14-122.219.1
  • ocfs2-kmp-default >= 4.12.14-122.219.1
Patchnames:
SUSE-SLE-HA-12-SP5-2024-2184
SUSE Linux Enterprise Live Patching 12 SP5
  • kernel-default-kgraft >= 4.12.14-122.219.1
  • kernel-default-kgraft-devel >= 4.12.14-122.219.1
Patchnames:
SUSE-SLE-Live-Patching-12-SP5-2024-2184
SUSE Linux Enterprise Real Time 12 SP5
  • cluster-md-kmp-rt >= 4.12.14-10.188.1
  • dlm-kmp-rt >= 4.12.14-10.188.1
  • gfs2-kmp-rt >= 4.12.14-10.188.1
  • kernel-devel-rt >= 4.12.14-10.188.1
  • kernel-rt >= 4.12.14-10.188.1
  • kernel-rt-base >= 4.12.14-10.188.1
  • kernel-rt-devel >= 4.12.14-10.188.1
  • kernel-rt_debug >= 4.12.14-10.188.1
  • kernel-rt_debug-devel >= 4.12.14-10.188.1
  • kernel-source-rt >= 4.12.14-10.188.1
  • kernel-syms-rt >= 4.12.14-10.188.1
  • ocfs2-kmp-rt >= 4.12.14-10.188.1
Patchnames:
SUSE-SLE-RT-12-SP5-2024-1983
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server for SAP Applications 12 SP5
  • kernel-azure >= 4.12.14-16.188.1
  • kernel-azure-base >= 4.12.14-16.188.1
  • kernel-azure-devel >= 4.12.14-16.188.1
  • kernel-default >= 4.12.14-122.219.1
  • kernel-default-base >= 4.12.14-122.219.1
  • kernel-default-devel >= 4.12.14-122.219.1
  • kernel-default-extra >= 4.12.14-122.219.1
  • kernel-default-man >= 4.12.14-122.219.1
  • kernel-devel >= 4.12.14-122.219.1
  • kernel-devel-azure >= 4.12.14-16.188.1
  • kernel-docs >= 4.12.14-122.219.1
  • kernel-macros >= 4.12.14-122.219.1
  • kernel-obs-build >= 4.12.14-122.219.1
  • kernel-source >= 4.12.14-122.219.1
  • kernel-source-azure >= 4.12.14-16.188.1
  • kernel-syms >= 4.12.14-122.219.1
  • kernel-syms-azure >= 4.12.14-16.188.1
Patchnames:
SUSE-SLE-SDK-12-SP5-2024-2184
SUSE-SLE-SERVER-12-SP5-2024-1979
SUSE-SLE-SERVER-12-SP5-2024-2184
SUSE-SLE-WE-12-SP5-2024-2184
SUSE Linux Enterprise Software Development Kit 12 SP5
  • kernel-docs >= 4.12.14-122.219.1
  • kernel-obs-build >= 4.12.14-122.219.1
Patchnames:
SUSE-SLE-SDK-12-SP5-2024-2184
SUSE Linux Enterprise Workstation Extension 12 SP5
  • kernel-default-extra >= 4.12.14-122.219.1
Patchnames:
SUSE-SLE-WE-12-SP5-2024-2184


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. The updates are grouped by state of their lifecycle. SUSE product lifecycles are documented on the lifecycle page.

Product(s) Source package State
Products under general support and receiving all security fixes.
SLES15-SP5-CHOST-BYOS-Aliyun kernel-default Analysis
SLES15-SP5-CHOST-BYOS-Azure kernel-default Analysis
SLES15-SP5-CHOST-BYOS-EC2 kernel-default Analysis
SLES15-SP5-CHOST-BYOS-GCE kernel-default Analysis
SLES15-SP5-CHOST-BYOS-SAP-CCloud kernel-default Analysis
SUSE Enterprise Storage 7.1 kernel-default Affected
SUSE Enterprise Storage 7.1 kernel-source Affected
SUSE Linux Enterprise Desktop 15 SP5 kernel-default Already fixed
SUSE Linux Enterprise Desktop 15 SP5 kernel-source Already fixed
SUSE Linux Enterprise Desktop 15 SP6 kernel-default Already fixed
SUSE Linux Enterprise Desktop 15 SP6 kernel-source Already fixed
SUSE Linux Enterprise High Availability Extension 12 SP5 kernel-default Released
SUSE Linux Enterprise High Availability Extension 15 SP5 kernel-default Analysis
SUSE Linux Enterprise High Performance Computing 12 SP5 kernel-azure Released
SUSE Linux Enterprise High Performance Computing 12 SP5 kernel-default Released
SUSE Linux Enterprise High Performance Computing 12 SP5 kernel-source Released
SUSE Linux Enterprise High Performance Computing 12 SP5 kernel-source-azure Released
SUSE Linux Enterprise High Performance Computing 12 SP5 kernel-syms Released
SUSE Linux Enterprise High Performance Computing 12 SP5 kernel-syms-azure Released
SUSE Linux Enterprise High Performance Computing 15 SP5 kernel-default Already fixed
SUSE Linux Enterprise High Performance Computing 15 SP5 kernel-source Already fixed
SUSE Linux Enterprise High Performance Computing 15 SP5 kernel-source-azure Already fixed
SUSE Linux Enterprise High Performance Computing 15 SP6 kernel-default Already fixed
SUSE Linux Enterprise High Performance Computing 15 SP6 kernel-source Already fixed
SUSE Linux Enterprise High Performance Computing 15 SP6 kernel-source-azure Already fixed
SUSE Linux Enterprise Live Patching 12 SP5 kernel-default Released
SUSE Linux Enterprise Live Patching 12 SP5 kgraft-patch-SLE12-SP5_Update_57 Released
SUSE Linux Enterprise Live Patching 15 SP5 kernel-default Analysis
SUSE Linux Enterprise Micro 5.1 kernel-default Affected
SUSE Linux Enterprise Micro 5.1 kernel-rt Affected
SUSE Linux Enterprise Micro 5.1 kernel-source-rt Affected
SUSE Linux Enterprise Micro 5.2 kernel-default Affected
SUSE Linux Enterprise Micro 5.2 kernel-rt Affected
SUSE Linux Enterprise Micro 5.2 kernel-source-rt Affected
SUSE Linux Enterprise Micro 5.3 kernel-default Already fixed
SUSE Linux Enterprise Micro 5.3 kernel-rt Already fixed
SUSE Linux Enterprise Micro 5.3 kernel-source-rt Already fixed
SUSE Linux Enterprise Micro 5.4 kernel-default Already fixed
SUSE Linux Enterprise Micro 5.4 kernel-rt Already fixed
SUSE Linux Enterprise Micro 5.4 kernel-source-rt Already fixed
SUSE Linux Enterprise Micro 5.5 kernel-default Analysis
SUSE Linux Enterprise Micro 5.5 kernel-source-rt Already fixed
SUSE Linux Enterprise Module for Basesystem 15 SP5 kernel-default Already fixed
SUSE Linux Enterprise Module for Basesystem 15 SP5 kernel-source Already fixed
SUSE Linux Enterprise Module for Basesystem 15 SP6 kernel-default Already fixed
SUSE Linux Enterprise Module for Basesystem 15 SP6 kernel-source Already fixed
SUSE Linux Enterprise Module for Development Tools 15 SP5 kernel-default Already fixed
SUSE Linux Enterprise Module for Development Tools 15 SP5 kernel-source Already fixed
SUSE Linux Enterprise Module for Development Tools 15 SP6 kernel-default Already fixed
SUSE Linux Enterprise Module for Development Tools 15 SP6 kernel-source Already fixed
SUSE Linux Enterprise Module for Legacy 15 SP5 kernel-default Analysis
SUSE Linux Enterprise Module for Public Cloud 15 SP5 kernel-source-azure Already fixed
SUSE Linux Enterprise Module for Public Cloud 15 SP6 kernel-source-azure Already fixed
SUSE Linux Enterprise Real Time 12 SP5 kernel-rt Released
SUSE Linux Enterprise Real Time 12 SP5 kernel-rt_debug Released
SUSE Linux Enterprise Real Time 12 SP5 kernel-source-rt Released
SUSE Linux Enterprise Real Time 12 SP5 kernel-syms-rt Released
SUSE Linux Enterprise Real Time 15 SP5 kernel-source-rt Already fixed
SUSE Linux Enterprise Real Time 15 SP6 kernel-source-rt Already fixed
SUSE Linux Enterprise Server 12 SP5 kernel-azure Released
SUSE Linux Enterprise Server 12 SP5 kernel-default Released
SUSE Linux Enterprise Server 12 SP5 kernel-docs Released
SUSE Linux Enterprise Server 12 SP5 kernel-obs-build Released
SUSE Linux Enterprise Server 12 SP5 kernel-source Released
SUSE Linux Enterprise Server 12 SP5 kernel-source-azure Released
SUSE Linux Enterprise Server 12 SP5 kernel-syms Released
SUSE Linux Enterprise Server 12 SP5 kernel-syms-azure Released
SUSE Linux Enterprise Server 15 SP5 kernel-default Already fixed
SUSE Linux Enterprise Server 15 SP5 kernel-source Already fixed
SUSE Linux Enterprise Server 15 SP5 kernel-source-azure Already fixed
SUSE Linux Enterprise Server 15 SP6 kernel-default Already fixed
SUSE Linux Enterprise Server 15 SP6 kernel-source Already fixed
SUSE Linux Enterprise Server 15 SP6 kernel-source-azure Already fixed
SUSE Linux Enterprise Server for SAP Applications 12 SP5 kernel-azure Released
SUSE Linux Enterprise Server for SAP Applications 12 SP5 kernel-default Released
SUSE Linux Enterprise Server for SAP Applications 12 SP5 kernel-docs Released
SUSE Linux Enterprise Server for SAP Applications 12 SP5 kernel-obs-build Released
SUSE Linux Enterprise Server for SAP Applications 12 SP5 kernel-source Released
SUSE Linux Enterprise Server for SAP Applications 12 SP5 kernel-source-azure Released
SUSE Linux Enterprise Server for SAP Applications 12 SP5 kernel-syms Released
SUSE Linux Enterprise Server for SAP Applications 12 SP5 kernel-syms-azure Released
SUSE Linux Enterprise Server for SAP Applications 15 SP5 kernel-default Already fixed
SUSE Linux Enterprise Server for SAP Applications 15 SP5 kernel-source Already fixed
SUSE Linux Enterprise Server for SAP Applications 15 SP5 kernel-source-azure Already fixed
SUSE Linux Enterprise Server for SAP Applications 15 SP6 kernel-default Already fixed
SUSE Linux Enterprise Server for SAP Applications 15 SP6 kernel-source Already fixed
SUSE Linux Enterprise Server for SAP Applications 15 SP6 kernel-source-azure Already fixed
SUSE Linux Enterprise Software Development Kit 12 SP5 kernel-docs Released
SUSE Linux Enterprise Software Development Kit 12 SP5 kernel-obs-build Released
SUSE Linux Enterprise Workstation Extension 12 SP5 kernel-default Released
SUSE Linux Enterprise Workstation Extension 15 SP5 kernel-default Analysis
SUSE Manager Proxy 4.3 kernel-default Already fixed
SUSE Manager Proxy 4.3 kernel-source Already fixed
SUSE Manager Retail Branch Server 4.3 kernel-default Already fixed
SUSE Manager Retail Branch Server 4.3 kernel-source Already fixed
SUSE Manager Server 4.3 kernel-default Already fixed
SUSE Manager Server 4.3 kernel-source Already fixed
SUSE Real Time Module 15 SP5 kernel-source-rt Already fixed
SUSE Real Time Module 15 SP6 kernel-source-rt Already fixed
openSUSE Leap 15.5 kernel-default Already fixed
openSUSE Leap 15.5 kernel-source Already fixed
openSUSE Leap 15.5 kernel-source-azure Already fixed
openSUSE Leap 15.5 kernel-source-rt Already fixed
openSUSE Leap 15.6 kernel-default Already fixed
openSUSE Leap 15.6 kernel-source Already fixed
openSUSE Leap 15.6 kernel-source-azure Already fixed
openSUSE Leap 15.6 kernel-source-rt Already fixed
Products under Long Term Service Pack support and receiving important and critical security fixes.
SUSE Linux Enterprise Desktop 15 SP4 kernel-source Already fixed
SUSE Linux Enterprise High Performance Computing 15 SP2 kernel-source Affected
SUSE Linux Enterprise High Performance Computing 15 SP2-ESPOS kernel-source Affected
SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS kernel-default Affected
SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS kernel-source Affected
SUSE Linux Enterprise High Performance Computing 15 SP3 kernel-source Affected
SUSE Linux Enterprise High Performance Computing 15 SP3-ESPOS kernel-source Affected
SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS kernel-default Affected
SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS kernel-source Affected
SUSE Linux Enterprise High Performance Computing 15 SP4 kernel-source Already fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS kernel-default Already fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS kernel-source Already fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS kernel-default Already fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS kernel-source Already fixed
SUSE Linux Enterprise Module for Basesystem 15 SP2 kernel-source Affected
SUSE Linux Enterprise Module for Basesystem 15 SP3 kernel-source Affected
SUSE Linux Enterprise Module for Basesystem 15 SP4 kernel-source Already fixed
SUSE Linux Enterprise Module for Development Tools 15 SP2 kernel-source Affected
SUSE Linux Enterprise Module for Development Tools 15 SP3 kernel-source Affected
SUSE Linux Enterprise Module for Development Tools 15 SP4 kernel-source Already fixed
SUSE Linux Enterprise Server 11 SP4 LTSS EXTREME CORE kernel-default Not affected
SUSE Linux Enterprise Server 11 SP4 LTSS EXTREME CORE kernel-source Not affected
SUSE Linux Enterprise Server 15 SP2 kernel-source Affected
SUSE Linux Enterprise Server 15 SP2-LTSS kernel-default Affected
SUSE Linux Enterprise Server 15 SP2-LTSS kernel-source Affected
SUSE Linux Enterprise Server 15 SP3 kernel-source Affected
SUSE Linux Enterprise Server 15 SP3-LTSS kernel-default Affected
SUSE Linux Enterprise Server 15 SP3-LTSS kernel-source Affected
SUSE Linux Enterprise Server 15 SP4 kernel-source Already fixed
SUSE Linux Enterprise Server 15 SP4-LTSS kernel-default Already fixed
SUSE Linux Enterprise Server 15 SP4-LTSS kernel-source Already fixed
SUSE Linux Enterprise Server for SAP Applications 15 SP2 kernel-default Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP2 kernel-source Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP3 kernel-default Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP3 kernel-source Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP4 kernel-default Already fixed
SUSE Linux Enterprise Server for SAP Applications 15 SP4 kernel-source Already fixed
Products past their end of life and not receiving proactive updates anymore.
HPE Helion OpenStack 8 kernel-source Affected
SUSE CaaS Platform 4.0 kernel-source Affected
SUSE Enterprise Storage 6 kernel-source Affected
SUSE Enterprise Storage 7 kernel-source Affected
SUSE Linux Enterprise Desktop 12 SP3 kernel-source Affected
SUSE Linux Enterprise Desktop 12 SP4 kernel-source Affected
SUSE Linux Enterprise Desktop 15 kernel-source Affected
SUSE Linux Enterprise Desktop 15 SP1 kernel-source Affected
SUSE Linux Enterprise Desktop 15 SP2 kernel-source Affected
SUSE Linux Enterprise Desktop 15 SP3 kernel-source Affected
SUSE Linux Enterprise High Performance Computing 15 kernel-source Affected
SUSE Linux Enterprise High Performance Computing 15 SP1 kernel-source Affected
SUSE Linux Enterprise High Performance Computing 15 SP1-ESPOS kernel-source Affected
SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS kernel-source Affected
SUSE Linux Enterprise High Performance Computing 15-ESPOS kernel-source Affected
SUSE Linux Enterprise High Performance Computing 15-LTSS kernel-source Affected
SUSE Linux Enterprise Micro 5.0 kernel-default Affected
SUSE Linux Enterprise Module for Basesystem 15 kernel-source Affected
SUSE Linux Enterprise Module for Basesystem 15 SP1 kernel-source Affected
SUSE Linux Enterprise Module for Development Tools 15 kernel-source Affected
SUSE Linux Enterprise Module for Development Tools 15 SP1 kernel-source Affected
SUSE Linux Enterprise Real Time 15 SP2 kernel-source Affected
SUSE Linux Enterprise Real Time 15 SP3 kernel-source Affected
SUSE Linux Enterprise Real Time 15 SP3 kernel-source-rt Affected
SUSE Linux Enterprise Real Time 15 SP4 kernel-source Already fixed
SUSE Linux Enterprise Real Time 15 SP4 kernel-source-rt Already fixed
SUSE Linux Enterprise Server 11 SP4 kernel-source Not affected
SUSE Linux Enterprise Server 11 SP4 LTSS kernel-default Not affected
SUSE Linux Enterprise Server 11 SP4 LTSS kernel-source Not affected
SUSE Linux Enterprise Server 11 SP4-LTSS kernel-source Not affected
SUSE Linux Enterprise Server 12 SP3 kernel-source Affected
SUSE Linux Enterprise Server 12 SP3-BCL kernel-source Affected
SUSE Linux Enterprise Server 12 SP3-ESPOS kernel-source Affected
SUSE Linux Enterprise Server 12 SP3-LTSS kernel-source Affected
SUSE Linux Enterprise Server 12 SP4 kernel-source Affected
SUSE Linux Enterprise Server 12 SP4-ESPOS kernel-source Affected
SUSE Linux Enterprise Server 12 SP4-LTSS kernel-default Affected
SUSE Linux Enterprise Server 12 SP4-LTSS kernel-source Affected
SUSE Linux Enterprise Server 15 kernel-source Affected
SUSE Linux Enterprise Server 15 SP1 kernel-source Affected
SUSE Linux Enterprise Server 15 SP1-BCL kernel-source Affected
SUSE Linux Enterprise Server 15 SP1-LTSS kernel-default Affected
SUSE Linux Enterprise Server 15 SP1-LTSS kernel-source Affected
SUSE Linux Enterprise Server 15 SP2-BCL kernel-source Affected
SUSE Linux Enterprise Server 15 SP3-BCL kernel-source Affected
SUSE Linux Enterprise Server 15-LTSS kernel-default Affected
SUSE Linux Enterprise Server 15-LTSS kernel-source Affected
SUSE Linux Enterprise Server for SAP Applications 12 SP3 kernel-source Affected
SUSE Linux Enterprise Server for SAP Applications 12 SP4 kernel-default Affected
SUSE Linux Enterprise Server for SAP Applications 12 SP4 kernel-source Affected
SUSE Linux Enterprise Server for SAP Applications 15 kernel-source Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP1 kernel-source Affected
SUSE Manager Proxy 4.0 kernel-source Affected
SUSE Manager Proxy 4.1 kernel-source Affected
SUSE Manager Proxy 4.2 kernel-source Affected
SUSE Manager Retail Branch Server 4.0 kernel-source Affected
SUSE Manager Retail Branch Server 4.1 kernel-source Affected
SUSE Manager Retail Branch Server 4.2 kernel-source Affected
SUSE Manager Server 4.0 kernel-source Affected
SUSE Manager Server 4.1 kernel-source Affected
SUSE Manager Server 4.2 kernel-source Affected
SUSE OpenStack Cloud 8 kernel-source Affected
SUSE OpenStack Cloud 9 kernel-default Affected
SUSE OpenStack Cloud 9 kernel-source Affected
SUSE OpenStack Cloud Crowbar 8 kernel-source Affected
SUSE OpenStack Cloud Crowbar 9 kernel-default Affected
SUSE OpenStack Cloud Crowbar 9 kernel-source Affected
SUSE Real Time Module 15 SP3 kernel-source-rt Affected
SUSE Real Time Module 15 SP4 kernel-source-rt Already fixed
Container Status
suse/hpc/warewulf4-x86_64/sle-hpc-node kernel-defaultAnalysis


SUSE Timeline for this CVE

CVE page created: Tue May 21 18:00:51 2024
CVE page last modified: Wed Jun 26 00:35:16 2024