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Fencer Vulns
medium 5.5

CVE-2025-12748 json

Libvirt: denial of service in xml parsing

published 2025-11-11 11 mo ago modified 2026-11-05 4 d ago also EUVD-2025-99083

cvss
5.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 13%
public exploits
0
none known

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.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 10 0:11.10.0-12.el10_2
  • Red Hat Red Hat Enterprise Linux 9 0:11.10.0-12.el9_8
  • libvirt Debian 13 11.3.0-3+deb13u2
  • libvirt Debian 14 11.10.0-1

debian advisories DEBIAN-CVE-2025-12748

  • libvirt Ubuntu 22.04 LTS 8.0.0-1ubuntu7.15
  • libvirt Ubuntu 24.04 LTS 10.0.0-2ubuntu8.11
  • libvirt Ubuntu 25.10 11.6.0-1ubuntu3.2
  • libvirt Ubuntu 26.04 LTS 11.6.0-1ubuntu7

ubuntu advisories UBUNTU-CVE-2025-12748

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • libvirt RHEL 9 11.10.0-12.el9_8
  • libvirt-nss RHEL 9 11.10.0-12.el9_8
  • libvirt-libs RHEL 9 11.10.0-12.el9_8
  • libvirt-client RHEL 9 11.10.0-12.el9_8
  • libvirt-daemon RHEL 9 11.10.0-12.el9_8
  • libvirt-ssh-proxy RHEL 9 11.10.0-12.el9_8
  • libvirt-daemon-kvm RHEL 9 11.10.0-12.el9_8
  • libvirt-daemon-log RHEL 9 11.10.0-12.el9_8

red hat advisories RHSA-2026:18748RHSA-2026:18326

  • libvirt Linux Micro 6.1 10.0.0-slfo.1.1_2.1
  • libvirt SLE Micro 5.4, SLE Micro 5.3 8.0.0-150400.7.14.1
  • libvirt SLE Module for Server Applications 15 SP7, SLE Module for Basesystem 15 SP7 11.0.0-150700.4.13.1
  • libvirt Linux Micro 6.0 10.0.0-4.1
  • libvirt SLE Micro 5.5 9.0.0-150500.6.26.1
  • libvirt SLE Micro 5.2 7.1.0-150300.6.44.1
  • libvirt openSUSE Leap 15.6 10.0.0-150600.8.12.1
  • libvirt SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 11.4.0-160000.3.1

suse advisories SUSE-SU-2026:21263-1SUSE-SU-2026:0375-1SUSE-SU-2026:0279-1SUSE-SU-2026:0193-1SUSE-SU-2026:20050-1SUSE-SU-2026:0080-1

  • libvirt openSUSE Leap 16.0 11.4.0-160000.3.1
  • libvirt openSUSE Tumbleweed 11.9.0-2.1

opensuse advisories openSUSE-SU-2025:20100-1openSUSE-SU-2025:15746-1

  • libvirt AlmaLinux 10 11.10.0-12.el10_2.alma.1
  • libvirt-nss AlmaLinux 10 11.10.0-12.el10_2.alma.1
  • libvirt-libs AlmaLinux 10 11.10.0-12.el10_2.alma.1
  • libvirt-client AlmaLinux 10 11.10.0-12.el10_2.alma.1
  • libvirt-daemon AlmaLinux 10 11.10.0-12.el10_2.alma.1
  • libvirt-ssh-proxy AlmaLinux 10 11.10.0-12.el10_2.alma.1
  • libvirt-daemon-kvm AlmaLinux 10 11.10.0-12.el10_2.alma.1
  • libvirt-daemon-log AlmaLinux 10 11.10.0-12.el10_2.alma.1

almalinux advisories ALSA-2026:18326ALSA-2026:18748

  • libvirt Rocky Linux 10 11.10.0-12.1.el10_2
  • libvirt Rocky Linux 9 11.10.0-12.el9

rocky linux advisories RLSA-2026:18326RLSA-2026:18748

  • libvirt Alpine 3.24, Alpine 3.23 11.10.0-r0

alpine advisories ALPINE-CVE-2025-12748

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • libvirt Azure Linux 3.0 10.0.0-7
  • libvirt CBL-Mariner 2.0 7.10.0-11

azure linux advisories AZL-70187AZL-70199

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-12748 updated cvss 5.5

libvirt: Denial of service in XML parsing

  • Red Hat Enterprise Linux 6 libvirt, libvirt-client, libvirt-python, libvirt-lock-sanlock Red Hat Enterprise Linux 7 libvirt, libvirt-nss, libvirt-libs, libvirt-admin, libvirt-client, libvirt-daemon, +24 more
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 libvirt, libvirt-nss, libvirt-libs, libvirt-admin, libvirt-client, libvirt-daemon, +22 more
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Enterprise Linux AppStream (v. 9) libvirt 11.10.0-12.el9_8, libvirt-nss 11.10.0-12.el9_8, libvirt-libs 11.10.0-12.el9_8, libvirt-client 11.10.0-12.el9_8, libvirt-daemon 11.10.0-12.el9_8, libvirt-ssh-proxy 11.10.0-12.el9_8, +23 more
    fixed: vendor fix RHSA-2026:18748
  • Red Hat Enterprise Linux AppStream (v. 10) libvirt 11.10.0-12.el10_2, libvirt-nss 11.10.0-12.el10_2, libvirt-libs 11.10.0-12.el10_2, libvirt-client 11.10.0-12.el10_2, libvirt-daemon 11.10.0-12.el10_2, libvirt-ssh-proxy 11.10.0-12.el10_2, +23 more
    fixed: vendor fix RHSA-2026:18326
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libvirt-daemon-plugin-sanlock 11.10.0-12.el9_8
    fixed: vendor fix RHSA-2026:18748
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libvirt-daemon-plugin-sanlock 11.10.0-12.el10_2
    fixed: vendor fix RHSA-2026:18326

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
11 mo ago

Exploit prediction

0.22% chance of exploitation in the next 30 days, higher than 13% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8

Classification

Weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.