CVE-2015-5307

Impact:
Important
Public Date:
2015-11-10
IAVA:
2015-B-0136
CWE:
CWE-835
Bugzilla:
1277172: CVE-2015-5307 virt: guest to host DoS by triggering an infinite loop in microcode via #AC exception
It was found that the x86 ISA (Instruction Set Architecture) is prone to a denial of service attack inside a virtualized environment in the form of an infinite loop in the microcode due to the way (sequential) delivering of benign exceptions such as #AC (alignment check exception) is handled. A privileged user inside a guest could use this flaw to create denial of service conditions on the host kernel.

Find out more about CVE-2015-5307 from the MITRE CVE dictionary dictionary and NIST NVD.

Statement

This issue affects the version of the kvm and xen packages as shipped with Red Hat Enterprise Linux 5.

This issue does not affect the versions of the kernel package as shipped with Red Hat Enterprise Linux 5 and Red Hat Enterprise MRG 2.

This issue affects the version of Linux kernel as shipped with Red Hat Enterprise Linux 6 and 7. Future kernel updates for the respective releases may address this issue.

Red Hat Enterprise Linux 5 is now in Production Phase 3 of the support and maintenance life cycle. Thus it 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 5.2
Base Metrics AV:A/AC:M/Au:S/C:N/I:N/A:C
Access Vector Adjacent Network
Access Complexity Medium
Authentication Single
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 Advanced Update Support 6.2 (kernel) RHSA-2016:0046 2016-01-19
Red Hat Enterprise Linux Advanced Update Support 6.5 (kernel) RHSA-2015:2645 2015-12-15
Red Hat Enterprise Linux 7 (kernel) RHSA-2015:2552 2015-12-08
Red Hat Enterprise Linux Extended Update Support 6.6 (kernel) RHSA-2016:0024 2016-01-12
Red Hat Enterprise Linux 6 (kernel) RHSA-2015:2636 2015-12-15
Red Hat Enterprise Linux Advanced Update Support 6.4 (kernel) RHSA-2016:0004 2016-01-07
Red Hat Enterprise Linux Extended Update Support 7.1 (kernel) RHSA-2015:2587 2015-12-09

Affected Packages State

Platform Package State
Red Hat Enterprise MRG 2 realtime-kernel Not affected
Red Hat Enterprise Linux 7 kernel-rt Not affected
Red Hat Enterprise Linux 5 xen Will not fix
Red Hat Enterprise Linux 5 kvm Will not fix
Red Hat Enterprise Linux 5 kernel Not affected

Acknowledgements

Red Hat would like to thank Ben Serebrin of Google Inc. for reporting this issue.

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