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
Status: NEW
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: impact=moderate,public=20180605,repor...
Keywords: Security
Depends On: 1589893 1624638 1657358 1589892
Blocks: 1589767
TreeView+ depends on / blocked
 
Reported: 2018-06-11 15:25 UTC by Laura Pardo
Modified: 2019-05-16 08:23 UTC (History)
47 users (show)

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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:
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Last Closed:


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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 J Pandit 2018-06-12 07:01:53 UTC
Acknowledgments:

Name: Andy Lutomirski, Mika Penttilä


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