Description
A flaw was found in libvirt while it generates SELinux MCS category pairs for VMs' dynamic labels. This flaw allows one exploited guest to access files labeled for another guest, resulting in the breaking out of sVirt confinement. The highest threat from this vulnerability is to confidentiality and integrity.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | libvirt | Fixed-In - libvirt v7.5.0 | — |
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 | 7.6.0-1 | — |
| Debian 13 | libvirt | 7.6.0-1 | — |
| Debian 12 | libvirt | 7.6.0-1 | — |
| Debian 10 | libvirt | 5.0.0-4+deb10u2 | DLA-3778-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | libvirt | 7.6.0-0ubuntu3 | — |
| Ubuntu 20.04 LTS | libvirt | 6.0.0-0ubuntu8.16 | USN-5399-1 |
| Ubuntu 18.04 LTS | libvirt | 4.0.0-1ubuntu8.21 | USN-5399-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| 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 8 | SLOF | 20191022-3.git899d9883.module+el8.2.0+5449+efc036dd | RHSA-2021:4191, RHSA-2021:3704, RHSA-2021:3703 |
| RHEL 8 | hivex +6 | 1.3.18-20.module+el8.2.0+5588+63a201c3 | RHSA-2021:4191, RHSA-2021:3704, RHSA-2021:3703 |
| RHEL 8 | libguestfs-winsupport | 8.2-1.module+el8.3.0+6423+e4cb6418 | RHSA-2021:4191, RHSA-2021:3704, RHSA-2021:3703 |
| RHEL 8 | libiscsi +2 | 1.18.0-8.module+el8.1.0+4066+0f1aadab | RHSA-2021:4191, RHSA-2021:3704, RHSA-2021:3703 |
| RHEL 8 | libnbd +5 | 1.2.2-1.module+el8.2.0+5644+32ac38d4 | RHSA-2021:4191, RHSA-2021:3704, RHSA-2021:3703 |
| RHEL 8 | libnbd-bash-completion | 1.6.0-3.module+el8.4.0+9856+bbc47853 | RHSA-2021:3703 |
| RHEL 8 | libtpms +1 | 0.7.0-1.20191018gitdc116933b7.module+el8.2.0+4793+b09dd2fb | RHSA-2021:3704, RHSA-2021:3703 |
| RHEL 8 | libvirt +28 | 6.0.0-25.6.module+el8.2.1+12457+868e9540 | RHSA-2021:4191, RHSA-2021:3704, RHSA-2021:3703 |
| RHEL 8 | libvirt-dbus | 1.3.0-2.module+el8.2.0+4793+b09dd2fb | RHSA-2021:4191, RHSA-2021:3704, RHSA-2021:3703 |
| RHEL 8 | libvirt-python +1 | 6.0.0-1.module+el8.2.0+5453+31b2b136 | RHSA-2021:4191, RHSA-2021:3704, RHSA-2021:3703 |
| RHEL 8 | libvirt-wireshark | 7.0.0-14.4.module+el8.4.0+12413+d23780e6 | RHSA-2021:3703 |
| RHEL 8 | nbdkit +13 | 1.16.2-4.module+el8.2.1+6710+effcb1df | RHSA-2021:4191, RHSA-2021:3704, RHSA-2021:3703 |
| RHEL 8 | nbdkit-nbd-plugin +4 | 1.24.0-1.module+el8.4.0+9341+96cf2672 | RHSA-2021:3703 |
| RHEL 8 | netcf +2 | 0.2.8-12.module+el8.1.0+4066+0f1aadab | RHSA-2021:4191, RHSA-2021:3704, RHSA-2021:3703 |
| RHEL 8 | perl-Sys-Virt | 6.0.0-1.module+el8.2.0+5488+267def79 | RHSA-2021:4191, RHSA-2021:3704, RHSA-2021:3703 |
| RHEL 8 | python-pyvmomi +1 | 6.7.1-7.module+el8.2.0+4793+b09dd2fb | RHSA-2021:3704, RHSA-2021:3703 |
| RHEL 8 | qemu-img +10 | 15:4.2.0-29.module+el8.2.1+12598+39ddf37a.9 | RHSA-2021:4191, RHSA-2021:3704, RHSA-2021:3703 |
| RHEL 8 | qemu-kiwi +3 | 15:5.2.0-16.module+el8.4.0+12596+209e4022.10 | RHSA-2021:3703 |
| RHEL 8 | seabios +2 | 1.13.0-2.module+el8.2.1+7284+aa32a2c4 | RHSA-2021:4191, RHSA-2021:3704, RHSA-2021:3703 |
| RHEL 8 | sgabios +1 | 1:0.20170427git-3.module+el8.1.0+4066+0f1aadab | RHSA-2021:4191, RHSA-2021:3704, RHSA-2021:3703 |
| RHEL 8 | supermin +1 | 5.1.19-10.module+el8.2.0+4793+b09dd2fb | RHSA-2021:4191, RHSA-2021:3704, RHSA-2021:3703 |
| RHEL 8 | swtpm +3 | 0.2.0-2.20200127gitff5a83b.module+el8.2.0+5579+d71178e0 | RHSA-2021:3704, RHSA-2021:3703 |
| RHEL 8 | virglrenderer +2 | 0.8.2-1.module+el8.2.0+5777+d9c2af8c | RHSA-2021:3704 |
| RHEL 8 | virt-dib +25 | 1:1.40.2-24.module+el8.2.1+7154+47ffd890 | RHSA-2021:4191, RHSA-2021:3704, RHSA-2021:3703 |
| RHEL 8 | virt-v2v-man-pages-ja +2 | 1:1.42.0-9.module+el8.4.0+9561+069bb9c1 | RHSA-2021:3703 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | hivex +4 | 1.3.18-21.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux 8 | libguestfs-winsupport | 8.2-1.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux 8 | libiscsi +2 | 1.18.0-8.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux 8 | libnbd +3 | 1.2.2-1.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux 8 | libvirt +28 | 6.0.0-37.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux 8 | libvirt-dbus | 1.3.0-2.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux 8 | nbdkit +13 | 1.16.2-4.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux 8 | netcf +2 | 0.2.8-12.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux 8 | perl-Sys-Virt +1 | 6.0.0-1.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux 8 | seabios +2 | 1.13.0-2.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux 8 | sgabios +1 | 1:0.20170427git-3.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux 8 | supermin +1 | 5.1.19-10.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux 8 | virt-dib +23 | 1:1.40.2-28.module_el8.5.0+2608+72063365.alma | ALSA-2021:4191 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | hivex | 1.3.18-21.module+el8.4.0+642+7e26f5e1 | RLSA-2021:4191 |
| Rocky Linux 8 | libguestfs | 1:1.40.2-28.module+el8.5.0+670+c4aa478c | RLSA-2021:4191 |
| Rocky Linux 8 | libguestfs-winsupport | 8.2-1.module+el8.4.0+534+4680a14e | RLSA-2021:4191 |
| Rocky Linux 8 | libiscsi | 1.18.0-8.module+el8.4.0+534+4680a14e | RLSA-2021:4191 |
| Rocky Linux 8 | libnbd | 1.2.2-1.module+el8.4.0+534+4680a14e | RLSA-2021:4191 |
| Rocky Linux 8 | libvirt | 6.0.0-37.module+el8.5.0+670+c4aa478c | RLSA-2021:4191 |
| Rocky Linux 8 | libvirt-dbus | 1.3.0-2.module+el8.4.0+534+4680a14e | RLSA-2021:4191 |
| Rocky Linux 8 | nbdkit | 1.16.2-4.module+el8.4.0+534+4680a14e | RLSA-2021:4191 |
| Rocky Linux 8 | netcf | 0.2.8-12.module+el8.4.0+534+4680a14e | RLSA-2021:4191 |
| Rocky Linux 8 | perl-Sys-Virt +1 | 6.0.0-1.module+el8.4.0+534+4680a14e | RLSA-2021:4191 |
| Rocky Linux 8 | qemu-kvm | 5:4.2.0-59.module+el8.5.0+670+c4aa478c | RLSA-2021:4191 |
| Rocky Linux 8 | seabios | 1.13.0-2.module+el8.4.0+534+4680a14e | RLSA-2021:4191 |
| Rocky Linux 8 | sgabios | 1:0.20170427git-3.module+el8.4.0+534+4680a14e | RLSA-2021:4191 |
| Rocky Linux 8 | supermin | 5.1.19-10.module+el8.4.0+534+4680a14e | RLSA-2021:4191 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP3 | libvirt | 7.1.0-6.5.1 | SUSE-SU-2021:2812-1 |
| SLES 15 SP2 | libvirt | 6.0.0-13.16.2 | SUSE-SU-2021:2471-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLE Micro 5.0 | libvirt | 6.0.0-13.16.2 | SUSE-SU-2021:2471-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | libvirt | 7.7.0-2.1 | openSUSE-SU-2024:11008-1 |
| openSUSE Leap 15.3 | libvirt | 7.1.0-6.5.1 | openSUSE-SU-2021:2812-1 |
| openSUSE Leap 15.2 | libvirt | 6.0.0-lp152.9.12.1 | openSUSE-SU-2021:1119-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | libvirt | 7.5.0-r0 | — |
| Alpine v3.23 | libvirt | 7.5.0-r0 | — |
| Alpine v3.22 | libvirt | 7.5.0-r0 | — |
| Alpine v3.21 | libvirt | 7.5.0-r0 | — |
| Alpine v3.20 | libvirt | 7.5.0-r0 | — |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | libvirt | 7.5.0-r0 | — |
| Alpine v3.18 | libvirt | 7.5.0-r0 | — |
| Alpine v3.17 | libvirt | 7.5.0-r0 | — |
| Alpine v3.16 | libvirt | 7.5.0-r0 | — |
| Alpine v3.15 | libvirt | 7.5.0-r0 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | hivex +6 | 1.3.18-21.module+el8.5.0+20365+3abb8f5b | ELSA-2023-12108, ELSA-2022-10093, ELSA-2021-4191 |
| Oracle Linux 8 | libguestfs-winsupport | 8.2-1.module+el8.3.0+7860+a7792d29 | ELSA-2023-12108, ELSA-2022-10093, ELSA-2021-4191 |
| Oracle Linux 8 | libiscsi +2 | 1.18.0-8.module+el8.3.0+7860+a7792d29 | ELSA-2023-12108, ELSA-2022-10093, ELSA-2021-4191 |
| Oracle Linux 8 | libnbd +5 | 1.2.2-1.module+el8.3.0+7860+a7792d29 | ELSA-2023-12108, ELSA-2022-10093, ELSA-2021-4191 |
| Oracle Linux 8 | libvirt +29 | 5.7.0-38.module+el8.7.0+20889+ec3df884 | ELSA-2023-12108, ELSA-2022-10093, ELSA-2021-4191 |
| Oracle Linux 8 | libvirt-dbus | 1.3.0-2.module+el8.3.0+7860+a7792d29 | ELSA-2023-12108, ELSA-2022-10093, ELSA-2021-4191 |
| Oracle Linux 8 | nbdkit +13 | 1.16.2-4.0.1.module+el8.3.0+7860+a7792d29 | ELSA-2023-12108, ELSA-2022-10093, ELSA-2021-4191 |
| Oracle Linux 8 | netcf +2 | 0.2.8-12.module+el8.3.0+7860+a7792d29 | ELSA-2023-12108, ELSA-2022-10093, ELSA-2021-4191 |
| Oracle Linux 8 | perl-Sys-Virt | 4.5.0-5.module+el8.7.0+20889+ec3df884 | ELSA-2023-12108, ELSA-2022-10093, ELSA-2021-4191 |
| Oracle Linux 8 | qemu-img +10 | 15:4.2.0-59.module+el8.5.0+20410+46b2d321 | ELSA-2023-12108, ELSA-2022-10093, ELSA-2021-4191 |
| Oracle Linux 8 | seabios +2 | 1.13.0-2.module+el8.3.0+7860+a7792d29 | ELSA-2023-12108, ELSA-2022-10093, ELSA-2021-4191 |
| Oracle Linux 8 | sgabios +1 | 1:0.20170427git-3.module+el8.3.0+7860+a7792d29 | ELSA-2023-12108, ELSA-2022-10093, ELSA-2021-4191 |
| Oracle Linux 8 | supermin +1 | 5.1.19-10.module+el8.3.0+7860+a7792d29 | ELSA-2023-12108, ELSA-2022-10093, ELSA-2021-4191 |
| Oracle Linux 8 | virt-dib +25 | 1:1.40.2-28.0.1.module+el8.5.0+20363+3abb8f5b | ELSA-2023-12108, ELSA-2022-10093, ELSA-2021-4191 |
| Oracle Linux 7 | libvirt +32 | 5.7.0-38.el7 | ELSA-2022-10062 |
Advisories 18
- ALSA-2021:4191 Moderate: virt:rhel and virt-devel:rhel security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2021:3704 Red Hat Security Advisory: virt:8.2 and virt-devel:8.2 security update Red Hat Security Advisories (RHSA) · Jul 5, 2026
- RHSA-2021:3703 Red Hat Security Advisory: virt:av and virt-devel:av security and bug fix update Red Hat Security Advisories (RHSA) · Jul 5, 2026
- RHSA-2021:4191 Red Hat Security Advisory: virt:rhel and virt-devel:rhel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- USN-5399-1 libvirt vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DLA-3778-1 libvirt - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2021:4191 Moderate: virt:rhel and virt-devel:rhel security, bug fix, and enhancement update Rocky Linux Security Advisories · Feb 5, 2026
- openSUSE-SU-2021:2812-1 Security update for libvirt SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:1119-1 Security update for libvirt SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11008-1 libvirt-7.7.0-2.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:2471-1 Security update for libvirt SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:2812-1 Security update for libvirt SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2022-1728 Red Enterprise Linux Advanced Virtualization: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 2, 2024
- WID-SEC-2022-1725 libvirt: Schwachstelle ermöglicht Offenlegung von Informationen BSI CERT-Bund (WID) · Apr 1, 2024
- ELSA-2023-12108 Important: virt:kvm_utils security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Feb 8, 2023
- ELSA-2022-10093 Important: virt:kvm_utils security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Dec 17, 2022
- ELSA-2022-10062 Important: libvirt security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Dec 6, 2022
- ELSA-2021-4191 Moderate: virt:ol and virt-devel:ol security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 16, 2021
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1977726
- https://gitlab.com/libvirt/libvirt/-/issues/153
- https://gitlab.com/libvirt/libvirt/-/commit/15073504dbb624d3f6c911e85557019d3620fdb2
- https://access.redhat.com/errata/RHSA-2021:3631
- https://security.netapp.com/advisory/ntap-20220331-0010/
- GLSA-202210-06 vendor-advisory
- [debian-lts-announce] 20240401 [SECURITY] [DLA 3778-1] libvirt security update mailing-list