Bug 2160023 (CVE-2022-2196) - CVE-2022-2196 kernel: KVM: nVMX: missing IBPB when exiting from nested guest can lead to Spectre v2 attacks
Summary: CVE-2022-2196 kernel: KVM: nVMX: missing IBPB when exiting from nested guest ...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2022-2196
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2160029 2160030 2160031 2160032 2160033
Blocks: 2159486
TreeView+ depends on / blocked
 
Reported: 2023-01-11 11:09 UTC by Mauro Matteo Cascella
Modified: 2023-05-16 22:37 UTC (History)
39 users (show)

Fixed In Version: kernel 6.2-rc1
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in the KVM's Intel nested virtualization feature (nVMX). Since L1 and L2 shared branch prediction modes (guest-user and guest-kernel), KVM did not protect indirect branches in L1 from steering by a malicious agent in L2. This could allow a malicious nested guest to carry out Spectre v2 attacks against L1 due to a missing IBPB at VM-exit time.
Clone Of:
Environment:
Last Closed: 2023-05-16 22:37:26 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2023:2148 0 None None None 2023-05-09 07:12:50 UTC
Red Hat Product Errata RHSA-2023:2458 0 None None None 2023-05-09 07:51:19 UTC
Red Hat Product Errata RHSA-2023:2736 0 None None None 2023-05-16 08:06:08 UTC
Red Hat Product Errata RHSA-2023:2951 0 None None None 2023-05-16 08:34:53 UTC

Description Mauro Matteo Cascella 2023-01-11 11:09:15 UTC 
Since L1 and L2 shared branch prediction modes (guest-user and guest-kernel), KVM did not protect indirect branches in L1 from steering by a
malicious agent in L2. This could allow a malicious L2 to carry out Spectre v2 attacks against L1 due to missing IBPB at VM-exit time.

Upstream patch & commit:
https://lore.kernel.org/all/20221019213620.1953281-3-jmattson@google.com/
https://github.com/torvalds/linux/commit/2e7eab81425ad6c875f2ed47c0ce01e78afc38a5
Comment 1 Mauro Matteo Cascella 2023-01-11 11:35:12 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2160031]
Comment 8 errata-xmlrpc 2023-05-09 07:12:47 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2023:2148 https://access.redhat.com/errata/RHSA-2023:2148
Comment 9 errata-xmlrpc 2023-05-09 07:51:16 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2023:2458 https://access.redhat.com/errata/RHSA-2023:2458
Comment 10 errata-xmlrpc 2023-05-16 08:06:05 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2023:2736 https://access.redhat.com/errata/RHSA-2023:2736
Comment 11 errata-xmlrpc 2023-05-16 08:34:49 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2023:2951 https://access.redhat.com/errata/RHSA-2023:2951
Comment 12 Product Security DevOps Team 2023-05-16 22:37:23 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2022-2196
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