Bug 1647588 (CVE-2018-19965) - CVE-2018-19965 xen: x86: DoS from attempting to use INVPCID with a non-canonical addresses
Summary: CVE-2018-19965 xen: x86: DoS from attempting to use INVPCID with a non-canoni...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2018-19965
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1651970
Blocks: 1647590
TreeView+ depends on / blocked
 
Reported: 2018-11-07 20:32 UTC by Laura Pardo
Modified: 2019-09-29 15:02 UTC (History)
22 users (show)

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Last Closed: 2018-11-08 16:19:12 UTC


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Description Laura Pardo 2018-11-07 20:32:12 UTC
A flaw was found in xen. The INVPCID instruction raises #GP[0] if an attempt is made to invalidate a non-canonical address. Older flushing mechanisms such as INVLPG tolerate this without error, and perform no action. There is one guest accessible path in Xen where a non-canonical address was passed into the TLB flushing code. This previously had no ill effect, but became vulnerable with the introduction of PCID to reduce the performance hit from the Meltdown mitigations.

Comment 1 Andrej Nemec 2018-11-21 10:34:01 UTC
References:

https://seclists.org/oss-sec/2018/q4/155

Comment 2 Andrej Nemec 2018-11-21 10:34:14 UTC
Acknowledgments:

Name: the Xen project

Comment 3 Andrej Nemec 2018-11-21 10:34:58 UTC
Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1651970]


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