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CVE-2012-2934

Impact:
Moderate
Public Date:
2012-06-12
Bugzilla:
824966: CVE-2012-2934 kernel: denial of service due to AMD Erratum #121

The MITRE CVE dictionary describes this issue as:

Xen 4.0, and 4.1, when running a 64-bit PV guest on "older" AMD CPUs, does not properly protect against a certain AMD processor bug, which allows local guest OS users to cause a denial of service (host hang) via sequential execution of instructions across a non-canonical boundary, a different vulnerability than CVE-2012-0217.

Find out more about CVE-2012-2934 from the MITRE CVE dictionary dictionary and NIST NVD.

Statement

This issue did not affect the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 5 and 6, and Red Hat Enterprise MRG, as those versions have a guard page between the end of the user-mode accessible virtual address space and the beginning of the non-canonical area due to CVE-2005-1764 fix.

This issue did affect the versions of Xen hypervisor as shipped with Red Hat Enterprise Linux 5. A kernel-xen update for Red Hat Enterprise Linux 5 is available to address this flaw.

CVSS v2 metrics

NOTE: The following CVSS v2 metrics and score provided are preliminary and subject to review.

Base Score 4.6
Base Metrics AV:A/AC:H/Au:N/C:N/I:N/A:C
Access Vector Adjacent Network
Access Complexity High
Authentication None
Confidentiality Impact None
Integrity Impact None
Availability Impact Complete

Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).

Red Hat Security Errata

Platform Errata Release Date
Red Hat Enterprise Linux 5 (kernel) RHSA-2012:0721 2012-06-12

Affected Packages State

Platform Package State
Red Hat Enterprise Linux 5 kernel-xen Affected
Red Hat Enterprise Linux 6 kernel Not affected
Red Hat Enterprise MRG 2 realtime-kernel Not affected

Acknowledgements

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

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