CVE-2014-8133

Impact:
Low
Public Date:
2014-12-15
Bugzilla:
1172797: CVE-2014-8133 kernel: x86: espfix(64) bypass via set_thread_area and CLONE_SETTLS
It was found that the espfix functionality could be bypassed by installing a 16-bit RW data segment into GDT instead of LDT (which espfix checks), and using that segment on the stack. A local, unprivileged user could potentially use this flaw to leak kernel stack addresses.

Find out more about CVE-2014-8133 from the MITRE CVE dictionary dictionary and NIST NVD.

Statement

This issue did not affect the Linux kernel packages as shipped with Red
Hat Enterprise Linux 7 and Red Hat Enterprise Linux MRG 2.

Red Hat Enterprise Linux 5 is now in Production 3 Phase of the support and
maintenance life cycle. This has been rated as having Low security
impact and is not currently planned to be addressed in future updates. For
additional information, refer to the Red Hat Enterprise Linux Life
Cycle: https://access.redhat.com/support/policy/updates/errata/.

CVSS v2 metrics

Base Score 1.9
Base Metrics AV:L/AC:M/Au:N/C:P/I:N/A:N
Access Vector Local
Access Complexity Medium
Authentication None
Confidentiality Impact Partial
Integrity Impact None
Availability Impact None

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 6 (kernel) RHSA-2015:1272 2015-07-20

Affected Packages State

Platform Package State
Red Hat Enterprise MRG 2 kernel Not affected
Red Hat Enterprise Linux 7 kernel Not affected
Red Hat Enterprise Linux 5 kernel Will not fix
Unless explicitly stated as not affected, all previous versions of packages in any minor update stream of a product listed here should be assumed vulnerable, although may not have been subject to full analysis.

Acknowledgements

Red Hat would like to thank Andy Lutomirski for reporting this issue.
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