An injection vulnerability was found in libvirt's virtual network driver. The network XML parser does not strip newline characters from DNS TXT record value attributes and SRV record domain/target attributes. These values are written verbatim into the dnsmasq configuration file generated by the network driver, allowing a user with permission to define virtual networks to inject arbitrary dnsmasq configuration directives such as dhcp-script, leading to arbitrary command execution as root.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade libvirt | Sep 21, 2026 | Aug 7, 2026 |
| Redhat_linux | — | No solution exists | Aug 10, 2026 | Aug 6, 2026 |
| Ubuntu | — | Upgrade libvirt0 (Ubuntu Pro)Upgrade libvirt-daemon-commonUpgrade libvirt-commonUpgrade libvirt-daemon-driver-storage-scsiUpgrade libvirt-daemon-lockUpgrade libvirt-sanlock (Ubuntu Pro)Upgrade libvirt-daemon-driver-storage-sheepdog (Ubuntu Pro)Upgrade libvirt0Upgrade libnss-libvirtUpgrade libvirt-daemon (Ubuntu Pro)Upgrade libvirt-daemon-driver-storage-rbd (Ubuntu Pro)Upgrade libvirt-daemon-driver-vbox (Ubuntu Pro)Upgrade libvirt-daemon-plugin-lockdUpgrade libvirt-bin (Ubuntu Pro)Upgrade libvirt-daemon-system-sysvUpgrade libvirt-daemon-driver-qemu (Ubuntu Pro)Upgrade libvirt-daemon-driver-xen (Ubuntu Pro)Upgrade libvirt-daemon-driver-storage-glusterUpgrade libvirt-daemon-driver-xenUpgrade libvirt0-hweUpgrade libvirt-daemon-driver-storage-iscsi-directUpgrade libvirt-daemon-system-systemdUpgrade libvirt-daemon-system (Ubuntu Pro)Upgrade libvirt-clientsUpgrade libvirt-daemon-driver-storage-mpathUpgrade libvirt-daemon-logUpgrade libvirt-daemon-driver-vboxUpgrade libvirt-daemon-driver-storage-zfsUpgrade libvirt-daemon-driver-lxc (Ubuntu Pro)Upgrade libvirt-daemon-driver-nodedevUpgrade libvirt-daemon-driver-storage-logicalUpgrade libvirt-daemon-driver-storage-diskUpgrade libvirt-daemon-systemUpgrade libvirt-daemon-plugin-sanlockUpgrade libvirt-daemon-system-systemd (Ubuntu Pro)Upgrade libvirt-daemon-system-sysv (Ubuntu Pro)Upgrade libvirt-daemon-driver-qemuUpgrade libvirt-daemon-driver-storage-gluster (Ubuntu Pro)Upgrade libvirt-daemon-driver-networkUpgrade libvirt-daemon-driver-storage-zfs (Ubuntu Pro)Upgrade libvirt-daemon-driver-storageUpgrade libvirt-daemon-driver-nwfilterUpgrade libvirt-clients (Ubuntu Pro)Upgrade libvirt-ssh-proxyUpgrade libvirt-wiresharkUpgrade libvirt-daemon-hweUpgrade libvirt-daemonUpgrade libvirt-daemon-config-nwfilterUpgrade libnss-libvirt (Ubuntu Pro)Upgrade libvirt-daemon-driver-storage-rbdUpgrade libvirt-clients-qemuUpgrade libvirt-wireshark (Ubuntu Pro)Upgrade libvirt-daemon-system-hweUpgrade libvirt-daemon-driver-storage-iscsiUpgrade libvirt-devUpgrade libvirt-daemon-driver-lxcUpgrade libvirt-sanlockUpgrade libvirt-login-shellUpgrade libvirt-daemon-driver-secretUpgrade libvirt-daemon-config-networkUpgrade libvirt-daemon-driver-interfaceUpgrade libvirt-dev (Ubuntu Pro) | Aug 20, 2026 | Aug 19, 2026 |
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