CVE-2020-14415

Description

A divide-by-zero flaw was found in the Open Sound System (OSS) implementation of the QEMU emulator. A guest user or process may use this flaw to crash the QEMU process on the host, resulting in a denial of service.

Statement

Open Sound System (OSS) is deprecated in favor of ALSA and disabled in Red Hat products. This flaw did not affect the following versions of QEMU as they did not include support for OSS:

  • qemu-kvm-ma as shipped with Red Hat Enterprise Linux 7.
  • qemu-kvm-rhev as shipped with Red Hat Virtualization and Red Hat OpenStack.
  • qemu-kvm as shipped with Red Hat Enterprise Linux 6, 7 and 8.
  • virt:8.2/qemu-kvm as shipped with RHEL Advanced Virtualization.

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).

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

CVSS v3 Score Breakdown

Red HatNVDcve.org
Base Score3.83.3N/A
Attack VectorLocalLocalN/A
Attack ComplexityLowLowN/A
Privileges RequiredLowLowN/A
User InteractionNoneNoneN/A
ScopeChangedUnchangedN/A
ConfidentialityNoneNoneN/A
Integrity ImpactNoneNoneN/A
Availability ImpactLowLowN/A

Vector

Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L

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

Understanding the Weakness (CWE)

CWE-369

Availability

Technical Impact: DoS: Crash, Exit, or Restart

A Divide by Zero results in a crash.

Acknowledgements

Red Hat would like to thank Ziming Zhang for reporting this issue.

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