CVE-2025-12748

Publication date 11 November 2025

Last updated 8 January 2026

Ubuntu priority

Cvss 3 Severity Score

Description

A flaw was discovered in libvirt in the XML file processing. More specifically, the parsing of user provided XML files was performed before the ACL checks. A malicious user with limited permissions could exploit this flaw by submitting a specially crafted XML file, causing libvirt to allocate too much memory on the host. The excessive memory consumption could lead to a libvirt process crash on the host, resulting in a denial-of-service condition.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
libvirt	25.10 questing	Fixed 11.6.0-1ubuntu3.2
	25.04 plucky	Fixed 11.0.0-2ubuntu6.5
	24.04 LTS noble	Fixed 10.0.0-2ubuntu8.11
	22.04 LTS jammy	Fixed 8.0.0-1ubuntu7.15
	20.04 LTS focal	Needs evaluation
	18.04 LTS bionic	Needs evaluation
	16.04 LTS xenial	Needs evaluation
	14.04 LTS trusty	Needs evaluation

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
libvirt	Upstream: e6de1e4 Upstream: b45f10b Upstream: a1f48bc Upstream: a6dcfee Upstream: 7285c10 Upstream: eb4322d Upstream: 2a326c4 Upstream: cf08064

Severity score breakdown

Parameter	Value
Base score	5.5 · Medium
Attack vector	Local
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

USN-7047-1
libvirt vulnerabilities
8 January 2026