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Bug 1566837 - (CVE-2018-1087) CVE-2018-1087 Kernel: KVM: error in exception handling leads to wrong debug stack value
CVE-2018-1087 Kernel: KVM: error in exception handling leads to wrong debug s...
Status: CLOSED ERRATA
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
high Severity high
: ---
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Assigned To: Red Hat Product Security
impact=important,public=20180508,repo...
: Security
Depends On: 1576070 1566842 1566843 1566844 1566845 1566846 1566847 1566848 1566849 1566850 1566851 1567907 1577045 1577046 1577047
Blocks: 1558424
  Show dependency treegraph
 
Reported: 2018-04-13 01:54 EDT by Prasad J Pandit
Modified: 2018-06-03 21:05 EDT (History)
79 users (show)

See Also:
Fixed In Version: kernel 4.16, kernel 4.16-rc7, kernel 4.17-rc1, kernel 4.17-rc2, kernel 4.17-rc3
Doc Type: Bug Fix
Doc Text:
A flaw was found in the way the Linux kernel's KVM hypervisor handled exceptions delivered after a stack switch operation via Mov SS or Pop SS instructions. During the stack switch operation, the processor did not deliver interrupts and exceptions, rather they are delivered once the first instruction after the stack switch is executed. An unprivileged KVM guest user could use this flaw to crash the guest or, potentially, escalate their privileges in the guest.
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Clone Of:
Environment:
Last Closed: 2018-05-28 09:53:13 EDT
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CRM:
Verified Versions:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
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Attachments (Terms of Use)


External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2018:1318 None None None 2018-05-08 14:26 EDT
Red Hat Product Errata RHSA-2018:1345 None None None 2018-05-08 15:49 EDT
Red Hat Product Errata RHSA-2018:1347 None None None 2018-05-08 17:38 EDT
Red Hat Product Errata RHSA-2018:1348 None None None 2018-05-08 17:53 EDT
Red Hat Product Errata RHSA-2018:1355 None None None 2018-05-08 18:24 EDT
Red Hat Product Errata RHSA-2018:1524 None None None 2018-05-15 13:39 EDT

  None (edit)
Description Prasad J Pandit 2018-04-13 01:54:03 EDT
A flaw was found in the way the Linux kernel's KVM hypervisor handled exceptions delivered after a stack switch operation via Mov SS or Pop SS instructions. During the stack switch operation, processor does not deliver interrupts and exceptions, they are delivered once the first instruction after the stack switch is executed.

An unprivileged KVM guest user could use this flaw to crash the guest and/or potentially escalate their privileges in the guest.

Upstream patch:
---------------
  -> https://git.kernel.org/linus/32d43cd391bacb5f0814c2624399a5dad3501d09

Reference:
----------
  -> http://www.openwall.com/lists/oss-security/2018/05/08/5
Comment 8 Prasad J Pandit 2018-05-02 08:10:51 EDT
Acknowledgments:

Name: Andy Lutomirski
Comment 9 Justin M. Forbes 2018-05-08 13:20:38 EDT
This issue was fixed for Fedora with the 4.16 rebases.
Comment 11 Eric Christensen 2018-05-08 13:37:42 EDT
Statement:

This issue does not affect the versions of Linux kernel as shipped with Red Hat Enterprise Linux 5, 6, and Red Hat Enterprise MRG 2.

This issue affects the version of the kernel package as shipped with Red Hat Enterprise Linux 7. Future kernel updates for Red Hat Enterprise Linux 7 may address this issue.
Comment 12 errata-xmlrpc 2018-05-08 14:25:49 EDT
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:1318 https://access.redhat.com/errata/RHSA-2018:1318
Comment 13 Fabio Olive Leite 2018-05-08 15:26:48 EDT
External References:

https://access.redhat.com/security/vulnerabilities/pop_ss
Comment 14 errata-xmlrpc 2018-05-08 15:48:58 EDT
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.4 Extended Update Support

Via RHSA-2018:1345 https://access.redhat.com/errata/RHSA-2018:1345
Comment 15 errata-xmlrpc 2018-05-08 17:37:55 EDT
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.2 Advanced Update Support
  Red Hat Enterprise Linux 7.2 Update Services for SAP Solutions
  Red Hat Enterprise Linux 7.2 Telco Extended Update Support

Via RHSA-2018:1347 https://access.redhat.com/errata/RHSA-2018:1347
Comment 16 errata-xmlrpc 2018-05-08 17:53:13 EDT
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.3 Extended Update Support

Via RHSA-2018:1348 https://access.redhat.com/errata/RHSA-2018:1348
Comment 17 errata-xmlrpc 2018-05-08 18:24:25 EDT
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:1355 https://access.redhat.com/errata/RHSA-2018:1355
Comment 19 errata-xmlrpc 2018-05-15 13:39:19 EDT
This issue has been addressed in the following products:

  Red Hat Virtualization 4 for RHEL-7

Via RHSA-2018:1524 https://access.redhat.com/errata/RHSA-2018:1524

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