CVE-2015-8553

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Last Modified: UTC

ModerateModerate ImpactWhat does this mean?

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Description

The CVE Program describes this issue as:

Xen allows guest OS users to obtain sensitive information from uninitialized locations in host OS kernel memory by not enabling memory and I/O decoding control bits. NOTE: this vulnerability exists because of an incomplete fix for CVE-2015-0777.

Statement

This issue does affect the Dom0 Xen kernel as shipped with Red Hat Enterprise Linux 5. Red Hat Enterprise Linux 5 is now in Production 3 Phase of the support and maintenance life cycle. This has been rated as having Moderate 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/.

This issue does affect the Dom0 Xen kernel as shipped with Red Hat Enterprise Linux 5.

Red Hat Enterprise Linux 5 is now in Production 3 Phase of the support and maintenance life cycle. This has been rated as having Moderate 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/.

Additional information

  • Bugzilla 1196266: xen: non-maskable interrupts triggerable by guests (xsa120)
  • FAQ: Frequently asked questions about CVE-2015-8553

Common Vulnerability Scoring System (CVSS) Score Details

Important note

CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).

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

CVSS v2 Score Breakdown
Red HatNVD

CVSS v2 Base Score

5.2

2.1

Attack Vector

Adjacent Network

Local

Access Complexity

Medium

Low

Authentication

Single

None

Confidentiality Impact

None

Partial

Integrity Impact

None

None

Availability Impact

Complete

None

CVSS v2 Vector

Red Hat: AV:A/AC:M/Au:S/C:N/I:N/A:C

NVD: AV:L/AC:L/Au:N/C:P/I:N/A:N

Frequently Asked Questions

Why is Red Hat's CVSS v3 score or Impact different from other vendors?

My product is listed as "Under investigation" or "Affected", when will Red Hat release a fix for this vulnerability?

What can I do if my product is listed as "Will not fix"?

What can I do if my product is listed as "Fix deferred"?

What is a mitigation?

I have a Red Hat product but it is not in the above list, is it affected?

Why is my security scanner reporting my product as vulnerable to this vulnerability even though my product version is fixed or not affected?

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