Bug 1589890 (CVE-2018-10853) - CVE-2018-10853 kernel: kvm: guest userspace to guest kernel write
Summary: CVE-2018-10853 kernel: kvm: guest userspace to guest kernel write
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2018-10853
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: 1589892 1589893 1624638 1657358 1772227 1772228 1772229 1772230 1788044
Blocks: 1589767
TreeView+ depends on / blocked
 
Reported: 2018-06-11 15:25 UTC by Laura Pardo
Modified: 2021-02-17 00:09 UTC (History)
47 users (show)

Fixed In Version: kernel 4.18
Doc Type: Bug Fix
Doc Text:
A flaw was found in the way Linux kernel KVM hypervisor emulated instructions such as sgdt/sidt/fxsave/fxrstor. It did not check current privilege(CPL) level while emulating unprivileged instructions. An unprivileged guest user/process could use this flaw to potentially escalate privileges inside guest.
Clone Of:
Environment:
Last Closed: 2019-08-06 13:18:50 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2019:2029 0 None None None 2019-08-06 12:04:04 UTC
Red Hat Product Errata RHSA-2019:2043 0 None None None 2019-08-06 12:06:28 UTC
Red Hat Product Errata RHSA-2020:0036 0 None None None 2020-01-07 12:26:06 UTC
Red Hat Product Errata RHSA-2020:0103 0 None None None 2020-01-14 15:53:15 UTC
Red Hat Product Errata RHSA-2020:0179 0 None None None 2020-01-21 17:01:58 UTC

Description Laura Pardo 2018-06-11 15:25:59 UTC 
A flaw was found in the way Linux kernel KVM hypervisor emulated instructions such as sgdt/sidt/fxsave/fxrstor. It did not check current privilege(CPL) level while emulating unprivileged instructions.

An unprivileged guest user/process could use this flaw to potentially escalate privileges inside guest.


Upstream patch:
---------------
  -> https://git.kernel.org/linus/3c9fa24ca7c9c47605672916491f79e8ccacb9e6

Issue introduced in: (kernel v4.10+)
--------------------
  -> https://git.kernel.org/linus/129a72a0d3c8e139a04512325384fe5ac119e74

Reference:
----------
  -> http://www.openwall.com/lists/oss-security/2018/09/02/1
Comment 1 Laura Pardo 2018-06-11 15:27:03 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1589892]
Comment 3 Prasad Pandit 2018-06-12 07:01:53 UTC 
Acknowledgments:

Name: Andy Lutomirski, Mika Penttilä
Comment 7 errata-xmlrpc 2019-08-06 12:04:01 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2019:2029 https://access.redhat.com/errata/RHSA-2019:2029
Comment 8 errata-xmlrpc 2019-08-06 12:06:26 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2019:2043 https://access.redhat.com/errata/RHSA-2019:2043
Comment 9 Product Security DevOps Team 2019-08-06 13:18:50 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-2018-10853
Comment 19 errata-xmlrpc 2020-01-07 12:26:00 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.5 Extended Update Support

Via RHSA-2020:0036 https://access.redhat.com/errata/RHSA-2020:0036
Comment 21 errata-xmlrpc 2020-01-14 15:53:11 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.4 Advanced Update Support
  Red Hat Enterprise Linux 7.4 Update Services for SAP Solutions
  Red Hat Enterprise Linux 7.4 Telco Extended Update Support

Via RHSA-2020:0103 https://access.redhat.com/errata/RHSA-2020:0103
Comment 22 errata-xmlrpc 2020-01-21 17:01:55 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.6 Extended Update Support

Via RHSA-2020:0179 https://access.redhat.com/errata/RHSA-2020:0179
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