NULL Pointer Dereference Affecting qemu package, versions <1:6.0+dfsg-1~ubuntu3


Severity

Recommended
low

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.34% (27th percentile)

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  • Snyk IDSNYK-UBUNTU2510-QEMU-15733832
  • published21 Mar 2026
  • disclosed28 May 2021

Introduced: 28 May 2021

CVE-2020-35504  (opens in a new tab)
CWE-476  (opens in a new tab)

How to fix?

Upgrade Ubuntu:25.10 qemu to version 1:6.0+dfsg-1~ubuntu3 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 Ubuntu. See How to fix? for Ubuntu:25.10 relevant fixed versions and status.

A NULL pointer dereference flaw was found in the SCSI emulation support of QEMU in versions before 6.0.0. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.

CVSS Base Scores

version 3.1