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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | libvirt | ≤ 11.9.0 | — |
| 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 | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | libvirt | 11.10.0-1 | — |
| Debian 13 | libvirt | 11.3.0-3+deb13u2 | — |
| Debian 12 | libvirt | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | libvirt | 11.6.0-1ubuntu7 | — |
| Ubuntu 25.10 | libvirt | 11.6.0-1ubuntu3.2 | — |
| Ubuntu 24.04 LTS | libvirt | 10.0.0-2ubuntu8.11 | — |
| Ubuntu 22.04 LTS | libvirt | 8.0.0-1ubuntu7.15 | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | libvirt | No fix yet | — |
| Ubuntu Pro 18.04 LTS | libvirt | No fix yet | — |
| Ubuntu Pro 16.04 LTS | libvirt | No fix yet | — |
| Ubuntu Pro 14.04 LTS | libvirt | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | libvirt +31 | 11.10.0-12.el10_2 | RHSA-2026:18326 |
| RHEL 9 | libvirt +31 | 11.10.0-12.el9_8 | RHSA-2026:18748 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | libvirt +31 | 11.10.0-12.el10_2.alma.1 | ALSA-2026:18326 |
| AlmaLinux 9 | libvirt +31 | 11.10.0-12.el9_8.alma.1 | ALSA-2026:18748 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | libvirt | 11.10.0-12.1.el10_2 | RLSA-2026:18326 |
| Rocky Linux 9 | libvirt | 11.10.0-12.el9 | RLSA-2026:18748 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | libvirt | 11.0.0-150700.4.13.1 | SUSE-SU-2026:0279-1 |
| SLES 12 SP5 | libvirt | 5.1.0-13.45.1 | SUSE-SU-2026:0193-1 |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | libvirt | 11.4.0-160000.3.1 | SUSE-SU-2025:21150-1 |
| SLES 16.0 | libvirt | 11.4.0-160000.3.1 | SUSE-SU-2025:21150-1 |
| SLE Micro 6.2 | libvirt | 11.4.0-160000.3.1 | SUSE-SU-2025:21082-1 |
| SLE Micro 6.1 | libvirt | 10.0.0-slfo.1.1_2.1 | SUSE-SU-2026:21263-1 |
| SLE Micro 6.0 | libvirt | 10.0.0-4.1 | SUSE-SU-2026:20050-1 |
| SLE Micro 5.5 | libvirt | 9.0.0-150500.6.26.1 | SUSE-SU-2026:0080-1 |
| SLE Micro 5.4 | libvirt | 8.0.0-150400.7.14.1 | SUSE-SU-2026:0375-1 |
| SLE Micro 5.3 | libvirt | 8.0.0-150400.7.14.1 | SUSE-SU-2026:0375-1 |
| SLE Micro 5.2 | libvirt | 7.1.0-150300.6.44.1 | SUSE-SU-2026:0079-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | libvirt | 11.9.0-2.1 | openSUSE-SU-2025:15746-1 |
| openSUSE Leap 16.0 | libvirt | 11.4.0-160000.3.1 | openSUSE-SU-2025:20100-1 |
| openSUSE Leap 15.6 | libvirt | 10.0.0-150600.8.12.1 | SUSE-SU-2026:0068-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | libvirt | 11.10.0-r0 | — |
| Alpine v3.23 | libvirt | 11.10.0-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | libvirt +30 | 4.5.0-36.amzn2.3.2 | ALAS2-2025-3115 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | libvirt | 10.0.0-7 | — |
| Azure Linux 2 (CBL-Mariner) | libvirt | 7.10.0-11 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | libvirt +31 | 11.10.0-12.4.0.1.el10_2 | ELSA-2026-18326 |
| Oracle Linux 9 | libvirt +31 | 11.10.0-12.3.0.1.el9_8 | ELSA-2026-18748 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 1 repository
-
TERESH1/CVE-2025-12748 ★ 0 · Nov 6, 2025
Proof of concept & details for CVE-2025-12748
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 22
- ALSA-2026:18748 Moderate: libvirt security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:18326 Moderate: libvirt security update AlmaLinux Security Advisories · Oct 29, 2026
- WID-SEC-2026-1598 libvirt: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Jul 21, 2026
- ELSA-2026-18326 Moderate: libvirt security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jul 21, 2026
- RHSA-2026:18326 Red Hat Security Advisory: libvirt security update Red Hat Security Advisories (RHSA) · Jul 12, 2026
- RHSA-2026:18748 Red Hat Security Advisory: libvirt security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- ELSA-2026-18748 Moderate: libvirt security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jun 30, 2026
- RLSA-2026:18326 Moderate: libvirt security update Rocky Linux Security Advisories · May 29, 2026
- RLSA-2026:18748 Moderate: libvirt security update Rocky Linux Security Advisories · May 28, 2026
- SUSE-SU-2026:21263-1 Security update for libvirt SUSE / openSUSE Security Updates · Apr 24, 2026
- openSUSE-SU-2025:20100-1 Security update for libvirt SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2025:15746-1 libvirt-11.9.0-2.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:20050-1 Security update for libvirt SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0375-1 Security update for libvirt SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0279-1 Security update for libvirt SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0079-1 Security update for libvirt SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0080-1 Security update for libvirt SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0068-1 Security update for libvirt SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:21150-1 Security update for libvirt SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:21082-1 Security update for libvirt SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0193-1 Security update for libvirt SUSE / openSUSE Security Updates · Mar 23, 2026
- ALAS2-2025-3115 Moderate: libvirt security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jan 5, 2026
References
- RHSA-2026:18326 vendor-advisory
- RHSA-2026:18748 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2025-12748 vdb-entry
- RHBZ#2413801 issue-tracking