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Bug 1589890 - (CVE-2018-10853) CVE-2018-10853 kernel: kvm: guest userspace to guest kernel write
CVE-2018-10853 kernel: kvm: guest userspace to guest kernel write
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
: ---
: ---
Assigned To: Red Hat Product Security
impact=moderate,public=20180605,repor...
: Security
Depends On: 1589893 1624638 1589892
Blocks: 1589767
  Show dependency tree / graph
 
Reported: 2018-06-11 11:25 EDT by Laura Pardo
Modified: 2018-10-04 07:03 EDT (History)
45 users (show)

See Also:
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.
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RHEL 7.3 requirements from Atomic Host:
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Description Laura Pardo 2018-06-11 11:25:59 EDT 
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:
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  -> https://git.kernel.org/linus/3c9fa24ca7c9c47605672916491f79e8ccacb9e6

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

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

Affects: fedora-all [bug 1589892]
Comment 3 Prasad J Pandit 2018-06-12 03:01:53 EDT 
Acknowledgments:

Name: Andy Lutomirski, Mika Penttilä
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