Incorrect Permission Assignment for Critical Resource Affecting libvirt package, versions <12.0.0-1ubuntu5.3


Severity

Recommended
0.0
medium
0
10

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.14% (3rd percentile)

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  • Snyk IDSNYK-UBUNTU2604-LIBVIRT-18741463
  • published15 Aug 2026
  • disclosed10 Aug 2026

Introduced: 10 Aug 2026

CVE-2026-63623  (opens in a new tab)
CWE-732  (opens in a new tab)

How to fix?

Upgrade Ubuntu:26.04 libvirt to version 12.0.0-1ubuntu5.3 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libvirt package and not the libvirt package as distributed by Ubuntu. See How to fix? for Ubuntu:26.04 relevant fixed versions and status.

A flaw was found in libvirt. During storage volume clone or convert operations, newly created volume images were temporarily world-readable. This was caused by the qemu-img utility running with overly permissive file creation settings, allowing any local user to read the full guest disk contents. This vulnerability could lead to sensitive information disclosure from guest virtual machines.

CVSS Base Scores

version 3.1