CVE-2016-4020 Affecting qemu package, versions <1:2.6+dfsg-2


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.37% (30th percentile)

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  • Snyk IDSNYK-ECHOLATEST-QEMU-18321699
  • published27 Jul 2026
  • disclosed25 May 2016

Introduced: 25 May 2016

CVE-2016-4020  (opens in a new tab)

How to fix?

Upgrade Echo:latest qemu to version 1:2.6+dfsg-2 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream qemu package and not the qemu package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

The patch_instruction function in hw/i386/kvmvapic.c in QEMU does not initialize the imm32 variable, which allows local guest OS administrators to obtain sensitive information from host stack memory by accessing the Task Priority Register (TPR).

CVSS Base Scores

version 3.1