Description
The networkReloadIptablesRules function in network/bridge_driver.c in libvirt before 0.9.9 does not properly handle firewall rules on bridge networks when libvirtd is restarted, which might allow remote attackers to bypass intended access restrictions via a (1) DNS or (2) DHCP query.
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 | 0.9.9-1 | — |
| Debian 13 | libvirt | 0.9.9-1 | — |
| Debian 12 | libvirt | 0.9.9-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | libvirt | 1.2.2-0ubuntu13.1.16 | USN-2867-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 6.2 EUS | libvirt +4 | 0.9.4-23.el6_2.4 | RHBA-2012:0013 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | libvirt | 2.5.0-1.1 | openSUSE-SU-2024:10209-1 |
Advisories 3
- RHBA-2012:0013 Red Hat Bug Fix Advisory: libvirt bug fix and enhancement update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-2867-1 libvirt vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- openSUSE-SU-2024:10209-1 libvirt-2.5.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026