Description
qemu/qemu_driver.c in libvirt before 6.0.0 mishandles the holding of a monitor job during a query to a guest agent, which allows attackers to cause a denial of service (API blockage).
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 | 6.0.0-2 | — |
| Debian 13 | libvirt | 6.0.0-2 | — |
| Debian 12 | libvirt | 6.0.0-2 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | SLOF | 20191022-3.git899d9883.module+el8.2.0+5449+efc036dd | RHSA-2020:4676, RHBA-2020:2017 |
| RHEL 8 | hivex +6 | 1.3.18-20.module+el8.2.0+5588+63a201c3 | RHSA-2020:4676, RHBA-2020:2017 |
| RHEL 8 | libguestfs-winsupport | 8.2-1.module+el8.2.0+5590+82cd80df | RHSA-2020:4676, RHBA-2020:2017 |
| RHEL 8 | libiscsi +2 | 1.18.0-8.module+el8.1.0+4066+0f1aadab | RHSA-2020:4676, RHBA-2020:2017 |
| RHEL 8 | libnbd +5 | 1.2.2-1.module+el8.2.0+5644+32ac38d4 | RHSA-2020:4676, RHBA-2020:2017 |
| RHEL 8 | libtpms +1 | 0.7.0-1.20191018gitdc116933b7.module+el8.2.0+4793+b09dd2fb | RHBA-2020:2017 |
| RHEL 8 | libvirt +28 | 6.0.0-17.module+el8.2.0+6257+0d066c28 | RHSA-2020:4676, RHBA-2020:2017 |
| RHEL 8 | libvirt-dbus | 1.3.0-2.module+el8.2.0+4793+b09dd2fb | RHSA-2020:4676, RHBA-2020:2017 |
| RHEL 8 | libvirt-python +1 | 6.0.0-1.module+el8.2.0+5453+31b2b136 | RHSA-2020:4676, RHBA-2020:2017 |
| RHEL 8 | nbdkit +13 | 1.16.2-2.module+el8.2.0+5664+dd92f997 | RHSA-2020:4676, RHBA-2020:2017 |
| RHEL 8 | netcf +2 | 0.2.8-12.module+el8.1.0+4066+0f1aadab | RHSA-2020:4676, RHBA-2020:2017 |
| RHEL 8 | perl-Sys-Virt | 6.0.0-1.module+el8.2.0+5488+267def79 | RHSA-2020:4676, RHBA-2020:2017 |
| RHEL 8 | python-pyvmomi +1 | 6.7.1-7.module+el8.2.0+4793+b09dd2fb | RHBA-2020:2017 |
| RHEL 8 | qemu-img +10 | 15:4.2.0-19.module+el8.2.0+6296+6b821950 | RHSA-2020:4676, RHBA-2020:2017 |
| RHEL 8 | seabios +2 | 1.13.0-1.module+el8.2.0+5520+4e5817f3 | RHSA-2020:4676, RHBA-2020:2017 |
| RHEL 8 | sgabios +1 | 1:0.20170427git-3.module+el8.1.0+4066+0f1aadab | RHSA-2020:4676, RHBA-2020:2017 |
| RHEL 8 | supermin +1 | 5.1.19-10.module+el8.2.0+4793+b09dd2fb | RHSA-2020:4676, RHBA-2020:2017 |
| RHEL 8 | swtpm +3 | 0.2.0-2.20200127gitff5a83b.module+el8.2.0+5579+d71178e0 | RHBA-2020:2017 |
| RHEL 8 | virglrenderer +2 | 0.8.2-1.module+el8.2.0+5777+d9c2af8c | RHBA-2020:2017 |
| RHEL 8 | virt-dib +25 | 1:1.40.2-22.module+el8.2.0+6029+618ef2ec | RHSA-2020:4676, RHBA-2020:2017 |
| RHEL 7 | libvirt +30 | 4.5.0-36.el7 | RHSA-2020:4000 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | hivex +6 | 1.3.18-20.module_el8.3.0+2048+e7a0a3ea | ALSA-2020:4676 |
| AlmaLinux 8 | libguestfs-winsupport | 8.2-1.module_el8.3.0+2048+e7a0a3ea | ALSA-2020:4676 |
| AlmaLinux 8 | libiscsi +2 | 1.18.0-8.module_el8.3.0+2048+e7a0a3ea | ALSA-2020:4676 |
| AlmaLinux 8 | libnbd +5 | 1.2.2-1.module_el8.3.0+2048+e7a0a3ea | ALSA-2020:4676 |
| AlmaLinux 8 | libvirt +24 | 6.0.0-28.module_el8.3.0+2048+e7a0a3ea | ALSA-2020:4676 |
| AlmaLinux 8 | libvirt-dbus | 1.3.0-2.module_el8.3.0+2048+e7a0a3ea | ALSA-2020:4676 |
| AlmaLinux 8 | nbdkit +13 | 1.16.2-4.module_el8.5.0+2608+72063365 | ALSA-2020:4676 |
| AlmaLinux 8 | netcf +2 | 0.2.8-12.module_el8.3.0+2048+e7a0a3ea | ALSA-2020:4676 |
| AlmaLinux 8 | ocaml-libguestfs +1 | 1:1.40.2-25.module_el8.3.0+2048+e7a0a3ea.alma | ALSA-2020:4676 |
| AlmaLinux 8 | perl-Sys-Virt +1 | 6.0.0-1.module_el8.3.0+2048+e7a0a3ea | ALSA-2020:4676 |
| AlmaLinux 8 | seabios +2 | 1.13.0-2.module_el8.5.0+2608+72063365 | ALSA-2020:4676 |
| AlmaLinux 8 | sgabios | 1:0.20170427git-3.module_el8.3.0+2048+e7a0a3ea | ALSA-2020:4676 |
| AlmaLinux 8 | sgabios-bin | 1:0.20170427git-3.module_el8.5.0+2608+72063365 | ALSA-2020:4676 |
| AlmaLinux 8 | supermin +1 | 5.1.19-10.module_el8.5.0+2608+72063365 | ALSA-2020:4676 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | hivex | 1.3.18-20.module+el8.4.0+534+4680a14e | RLSA-2020:4676 |
| Rocky Linux 8 | libguestfs-winsupport | 8.2-1.module+el8.4.0+534+4680a14e | RLSA-2020:4676 |
| Rocky Linux 8 | libiscsi | 1.18.0-8.module+el8.4.0+534+4680a14e | RLSA-2020:4676 |
| Rocky Linux 8 | libnbd | 1.2.2-1.module+el8.4.0+534+4680a14e | RLSA-2020:4676 |
| Rocky Linux 8 | libvirt-dbus | 1.3.0-2.module+el8.4.0+534+4680a14e | RLSA-2020:4676 |
| Rocky Linux 8 | nbdkit | 1.16.2-4.module+el8.4.0+534+4680a14e | RLSA-2020:4676 |
| Rocky Linux 8 | netcf | 0.2.8-12.module+el8.4.0+534+4680a14e | RLSA-2020:4676 |
| Rocky Linux 8 | perl-Sys-Virt +1 | 6.0.0-1.module+el8.4.0+534+4680a14e | RLSA-2020:4676 |
| Rocky Linux 8 | seabios | 1.13.0-2.module+el8.4.0+534+4680a14e | RLSA-2020:4676 |
| Rocky Linux 8 | sgabios | 1:0.20170427git-3.module+el8.4.0+534+4680a14e | RLSA-2020:4676 |
| Rocky Linux 8 | supermin | 5.1.19-10.module+el8.4.0+534+4680a14e | RLSA-2020:4676 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.11 | libvirt | 5.9.0-r2 | — |
| Alpine v3.10 | libvirt | 5.5.0-r2 | — |
| Alpine v3.9 | libvirt | 5.5.0-r2 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | libvirt +30 | 4.5.0-36.amzn2.2 | ALAS2-2020-1557 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | hivex +6 | 1.3.18-20.module+el8.3.0+7860+a7792d29 | ELSA-2020-4676 |
| Oracle Linux 8 | libguestfs-winsupport | 8.2-1.module+el8.3.0+7860+a7792d29 | ELSA-2020-4676 |
| Oracle Linux 8 | libiscsi +2 | 1.18.0-8.module+el8.3.0+7860+a7792d29 | ELSA-2020-4676 |
| Oracle Linux 8 | libnbd +5 | 1.2.2-1.module+el8.3.0+7860+a7792d29 | ELSA-2020-4676 |
| Oracle Linux 8 | libvirt +28 | 6.0.0-28.0.1.module+el8.3.0+7860+a7792d29 | ELSA-2020-4676 |
| Oracle Linux 8 | libvirt-dbus | 1.3.0-2.module+el8.3.0+7860+a7792d29 | ELSA-2020-4676 |
| Oracle Linux 8 | nbdkit +13 | 1.16.2-4.0.1.module+el8.3.0+7860+a7792d29 | ELSA-2020-4676 |
| Oracle Linux 8 | netcf +2 | 0.2.8-12.module+el8.3.0+7860+a7792d29 | ELSA-2020-4676 |
| Oracle Linux 8 | perl-Sys-Virt +1 | 6.0.0-1.module+el8.3.0+7860+a7792d29 | ELSA-2020-4676 |
| Oracle Linux 8 | qemu-img +10 | 15:4.2.0-34.module+el8.3.0+7860+a7792d29 | ELSA-2020-4676 |
| Oracle Linux 8 | seabios +2 | 1.13.0-2.module+el8.3.0+7860+a7792d29 | ELSA-2020-4676 |
| Oracle Linux 8 | sgabios +1 | 1:0.20170427git-3.module+el8.3.0+7860+a7792d29 | ELSA-2020-4676 |
| Oracle Linux 8 | supermin +1 | 5.1.19-10.module+el8.3.0+7860+a7792d29 | ELSA-2020-4676 |
| Oracle Linux 8 | virt-dib +25 | 1:1.40.2-25.0.1.module+el8.3.0+7860+a7792d29 | ELSA-2020-4676 |
| Oracle Linux 7 | libvirt +30 | 4.5.0-36.el7 | ELSA-2020-5674, ELSA-2020-4000 |
| Oracle Linux 7 | libvirt-daemon-qemu | 5.7.0-13.el7 | ELSA-2020-5674 |
Advisories 10
- ALSA-2020:4676 Moderate: virt:rhel and virt-devel:rhel security, bug fix, and enhancement update AlmaLinux Security Advisories · Nov 5, 2026
- RHSA-2020:4676 Red Hat Security Advisory: virt:rhel and virt-devel:rhel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- RHSA-2020:4000 Red Hat Security Advisory: libvirt security and bug fix update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHBA-2020:2017 Red Hat Bug Fix Advisory: Advanced Virtualization bug fix and enhancement update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RLSA-2020:4676 Moderate: virt:rhel and virt-devel:rhel security, bug fix, and enhancement update Rocky Linux Security Advisories · Feb 5, 2026
- WID-SEC-2024-1980 libvirt: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Sep 2, 2024
- ALAS2-2020-1557 Moderate: libvirt security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Nov 11, 2020
- ELSA-2020-4676 Moderate: virt:ol and virt-devel:rhel security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 10, 2020
- ELSA-2020-4000 Moderate: libvirt security and bug fix update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Oct 6, 2020
- ELSA-2020-5674 Important: libvirt security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · May 7, 2020
References
- https://libvirt.org/git/?p=libvirt.git%3Ba=commit%3Bh=a663a860819287e041c3de672aad1d8543098ecc
- https://www.mail-archive.com/debian-bugs-dist%40lists.debian.org/msg1730509.html
- https://bugzilla.redhat.com/show_bug.cgi?id=1809740
- https://security-tracker.debian.org/tracker/CVE-2019-20485
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=953078
- FEDORA-2020-5cd83efda7 vendor-advisory