CVE-2016-4020

Description

An information-exposure flaw was found in Quick Emulator (QEMU) in Task Priority Register (TPR) optimizations for 32-bit Windows guests. The flaw could occur while accessing TPR. A privileged user inside a guest could use this issue to read portions of the host memory.

Statement

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/.

Common Vulnerability Scoring System (CVSS) Score Details

Info alert: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).

CVSS v3 Score Breakdown

Red HatNVDcve.org
Base Score3.46.5N/A
Attack VectorAdjacent NetworkLocalN/A
Attack ComplexityHighLowN/A
Privileges RequiredNoneLowN/A
User InteractionNoneNoneN/A
ScopeChangedChangedN/A
ConfidentialityLowHighN/A
Integrity ImpactNoneNoneN/A
Availability ImpactNoneNoneN/A

Vector

Red Hat: CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N

NVD: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Understanding the Weakness (CWE)

CWE-200

Confidentiality

Technical Impact: Read Application Data

Acknowledgements

Red Hat would like to thank Donghai Zdh (Alibaba Inc.) for reporting this issue.

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