Bug 1144499 (CVE-2014-7188) - CVE-2014-7188 kernel: xen: Improper MSR range used for x2APIC emulation (xsa108)
Summary: CVE-2014-7188 kernel: xen: Improper MSR range used for x2APIC emulation (xsa108)
Alias: CVE-2014-7188
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Depends On: 1148465
Blocks: 1140259
TreeView+ depends on / blocked
Reported: 2014-09-19 14:31 UTC by Petr Matousek
Modified: 2023-05-12 05:36 UTC (History)
8 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2014-09-19 14:34:49 UTC

Attachments (Terms of Use)

Description Petr Matousek 2014-09-19 14:31:52 UTC
The MSR range specified for APIC use in the x2APIC access model spans
256 MSRs. Hypervisor code emulating read and write accesses to these
MSRs erroneously covered 1024 MSRs. While the write emulation path is
written such that accesses to the extra MSRs would not have any bad
effect (they end up being no-ops), the read path would (attempt to)
access memory beyond the single page set up for APIC emulation.

A buggy or malicious HVM guest can crash the host or read data
relating to other guests or the hypervisor itself.


Red Hat would like to thank the Xen for reporting this issue.

Comment 2 Petr Matousek 2014-09-19 14:34:49 UTC

Not vulnerable.

This issue does not affect the versions of the kernel-xen package as shipped with Red Hat Enterprise Linux 5.

Comment 3 Vasyl Kaigorodov 2014-10-01 12:17:34 UTC
This is public now: http://seclists.org/oss-sec/2014/q4/7

Comment 4 Petr Matousek 2014-10-01 14:00:40 UTC
Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1148465]

Comment 5 Fedora Update System 2014-10-08 19:08:50 UTC
xen-4.4.1-6.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.

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