Medium [CVE-2025-12748] Libvirt: denial of service in xml parsing
This medium-severity Red Hat Linux advisory covers CVE-2025-12748 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 6.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
VulniPulse record published
Summary
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.
Red Hat severity: Moderate — CVSS 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-770.
Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8. Will not fix / out of support: Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7.
Red Hat fixing advisory: RHSA-2026:18326, RHSA-2026:18748.
Affected products named by the advisory: Red Hat package: libvirt.
Is CVE-2025-12748 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2025-12748 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.
How do I fix CVE-2025-12748?
Upgrade to a fixed release named by Red Hat:
- libvirt-0:11.10.0-12.el10_2
- libvirt-0:11.10.0-12.el9_8
- RHSA-2026:18326
- RHSA-2026:18748
Confirm against the vendor advisory before you patch.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
- libvirt-0:11.10.0-12.el10_2
- libvirt-0:11.10.0-12.el9_8
- RHSA-2026:18326
- RHSA-2026:18748
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
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