Use After Free Affecting qemu package, versions <1:6.0+dfsg-3


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.37% (29th percentile)

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  • Snyk IDSNYK-ECHOLATEST-QEMU-18321994
  • published27 Jul 2026
  • disclosed28 May 2021

Introduced: 28 May 2021

CVE-2020-35506  (opens in a new tab)
CWE-416  (opens in a new tab)

How to fix?

Upgrade Echo:latest qemu to version 1:6.0+dfsg-3 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.

A use-after-free vulnerability was found in the am53c974 SCSI host bus adapter emulation of QEMU in versions before 6.0.0 during the handling of the 'Information Transfer' command (CMD_TI). This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service or potential code execution with the privileges of the QEMU process.

CVSS Base Scores

version 3.1