CVE-2026-63623

Publication date 10 August 2026

Last updated 25 August 2026

Ubuntu priority

Cvss 3 Severity Score

Description

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.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
libvirt	26.04 LTS resolute	Fixed 12.0.0-1ubuntu5.3
	24.04 LTS noble	Fixed 10.0.0-2ubuntu8.16
	22.04 LTS jammy	Fixed 8.0.0-1ubuntu7.19
	20.04 LTS focal	Fixed 6.0.0-0ubuntu8.20+esm1
	18.04 LTS bionic	Fixed 4.0.0-1ubuntu8.21+esm1
	16.04 LTS xenial	Fixed 1.3.1-1ubuntu10.31+esm1
	14.04 LTS trusty	Fixed 1.2.2-0ubuntu13.1.28+esm2

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Severity score breakdown

CVSS version: CVSS v3.0

Base score 5.5 · Medium

Base metrics

Parameter	Value
Attack vector	Local
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality impact	High
Integrity impact	None
Availability impact	None

Scores

Parameter	Value
Base score	5.5 · Medium
Exploitability score	-
Impact score	-

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