Description
A flaw was found in qemu. A host privilege escalation issue was found in the virtio-fs shared file system daemon where a privileged guest user is able to create a device special file in the shared directory and use it to r/w access host devices.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | qemu | qemu 5.2.0 | — |
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 | qemu | 1:5.2+dfsg-5 | — |
| Debian 13 | qemu | 1:5.2+dfsg-5 | — |
| Debian 12 | qemu | 1:5.2+dfsg-5 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | SLOF | 20191022-3.git899d9883.module+el8.2.0+5449+efc036dd | RHSA-2021:0743, RHSA-2021:0711, RHBA-2021:0639 |
| RHEL 8 | hivex +6 | 1.3.18-20.module+el8.2.0+5588+63a201c3 | RHSA-2021:0743, RHSA-2021:0711, RHBA-2021:0639 |
| RHEL 8 | libguestfs-winsupport | 8.2-1.module+el8.2.0+5590+82cd80df | RHSA-2021:0743, RHSA-2021:0711, RHBA-2021:0639 |
| RHEL 8 | libiscsi +2 | 1.18.0-8.module+el8.1.0+4066+0f1aadab | RHSA-2021:0743, RHSA-2021:0711, RHBA-2021:0639 |
| RHEL 8 | libnbd +5 | 1.2.2-1.module+el8.2.0+5644+32ac38d4 | RHSA-2021:0743, RHSA-2021:0711, RHBA-2021:0639 |
| RHEL 8 | libnbd-bash-completion | 1.4.0-2.module+el8.3.0+7998+6ff5e5ab | RHBA-2021:0639 |
| RHEL 8 | libtpms +1 | 0.7.0-1.20191018gitdc116933b7.module+el8.2.0+4793+b09dd2fb | RHSA-2021:0743, RHBA-2021:0639 |
| RHEL 8 | libvirt +28 | 6.0.0-25.5.module+el8.2.1+8680+ea98947b | RHSA-2021:0743, RHSA-2021:0711, RHBA-2021:0639 |
| RHEL 8 | libvirt-dbus | 1.3.0-2.module+el8.2.0+4793+b09dd2fb | RHSA-2021:0743, RHSA-2021:0711, RHBA-2021:0639 |
| RHEL 8 | libvirt-python +1 | 6.0.0-1.module+el8.2.0+5453+31b2b136 | RHSA-2021:0743, RHSA-2021:0711, RHBA-2021:0639 |
| RHEL 8 | nbdkit +13 | 1.16.2-4.module+el8.2.1+6710+effcb1df | RHSA-2021:0743, RHSA-2021:0711, RHBA-2021:0639 |
| RHEL 8 | nbdkit-nbd-plugin +4 | 1.22.0-2.module+el8.3.0+8203+18ecf00e | RHBA-2021:0639 |
| RHEL 8 | netcf +2 | 0.2.8-12.module+el8.1.0+4066+0f1aadab | RHSA-2021:0743, RHSA-2021:0711, RHBA-2021:0639 |
| RHEL 8 | perl-Sys-Virt | 6.0.0-1.module+el8.2.0+5488+267def79 | RHSA-2021:0743, RHSA-2021:0711, RHBA-2021:0639 |
| RHEL 8 | python-pyvmomi +1 | 6.7.1-7.module+el8.2.0+4793+b09dd2fb | RHSA-2021:0743, RHBA-2021:0639 |
| RHEL 8 | qemu-img +10 | 15:4.2.0-29.module+el8.2.1+9917+2543143c.7 | RHSA-2021:0743, RHSA-2021:0711, RHBA-2021:0639 |
| RHEL 8 | qemu-kiwi +1 | 15:5.1.0-20.module+el8.3.1+9918+230f5c26 | RHBA-2021:0639 |
| RHEL 8 | seabios +2 | 1.13.0-2.module+el8.2.1+7284+aa32a2c4 | RHSA-2021:0743, RHSA-2021:0711, RHBA-2021:0639 |
| RHEL 8 | sgabios +1 | 1:0.20170427git-3.module+el8.1.0+4066+0f1aadab | RHSA-2021:0743, RHSA-2021:0711, RHBA-2021:0639 |
| RHEL 8 | supermin +1 | 5.1.19-10.module+el8.2.0+4793+b09dd2fb | RHSA-2021:0743, RHSA-2021:0711, RHBA-2021:0639 |
| RHEL 8 | swtpm +3 | 0.2.0-2.20200127gitff5a83b.module+el8.2.0+5579+d71178e0 | RHSA-2021:0743, RHBA-2021:0639 |
| RHEL 8 | virglrenderer +2 | 0.8.2-1.module+el8.2.0+5777+d9c2af8c | RHSA-2021:0743 |
| RHEL 8 | virt-dib +25 | 1:1.40.2-24.module+el8.2.1+7154+47ffd890 | RHSA-2021:0743, RHSA-2021:0711, RHBA-2021:0639 |
| RHEL 8 | virt-v2v-man-pages-ja +2 | 1:1.42.0-7.module+el8.3.1+9562+c3ede7c6 | RHBA-2021:0639 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | hivex +6 | 1.3.18-20.module_el8.3.0+2048+e7a0a3ea | ALSA-2021:0711 |
| AlmaLinux 8 | libguestfs-winsupport | 8.2-1.module_el8.3.0+2048+e7a0a3ea | ALSA-2021:0711 |
| AlmaLinux 8 | libiscsi +2 | 1.18.0-8.module_el8.3.0+2048+e7a0a3ea | ALSA-2021:0711 |
| AlmaLinux 8 | libnbd +5 | 1.2.2-1.module_el8.3.0+2048+e7a0a3ea | ALSA-2021:0711 |
| AlmaLinux 8 | libvirt +24 | 6.0.0-28.module_el8.3.0+2048+e7a0a3ea | ALSA-2021:0711 |
| AlmaLinux 8 | libvirt-dbus | 1.3.0-2.module_el8.3.0+2048+e7a0a3ea | ALSA-2021:0711 |
| AlmaLinux 8 | nbdkit +13 | 1.16.2-4.module_el8.5.0+2608+72063365 | ALSA-2021:0711 |
| AlmaLinux 8 | netcf +2 | 0.2.8-12.module_el8.3.0+2048+e7a0a3ea | ALSA-2021:0711 |
| AlmaLinux 8 | ocaml-libguestfs +1 | 1:1.40.2-25.module_el8.3.0+2048+e7a0a3ea.alma | ALSA-2021:0711 |
| AlmaLinux 8 | perl-Sys-Virt +1 | 6.0.0-1.module_el8.3.0+2048+e7a0a3ea | ALSA-2021:0711 |
| AlmaLinux 8 | seabios +2 | 1.13.0-2.module_el8.5.0+2608+72063365 | ALSA-2021:0711 |
| AlmaLinux 8 | sgabios | 1:0.20170427git-3.module_el8.3.0+2048+e7a0a3ea | ALSA-2021:0711 |
| AlmaLinux 8 | sgabios-bin | 1:0.20170427git-3.module_el8.5.0+2608+72063365 | ALSA-2021:0711 |
| AlmaLinux 8 | supermin +1 | 5.1.19-10.module_el8.5.0+2608+72063365 | ALSA-2021:0711 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | hivex | 1.3.18-20.module+el8.4.0+534+4680a14e | RLSA-2021:0711 |
| Rocky Linux 8 | libguestfs-winsupport | 8.2-1.module+el8.4.0+534+4680a14e | RLSA-2021:0711 |
| Rocky Linux 8 | libiscsi | 1.18.0-8.module+el8.4.0+534+4680a14e | RLSA-2021:0711 |
| Rocky Linux 8 | libnbd | 1.2.2-1.module+el8.4.0+534+4680a14e | RLSA-2021:0711 |
| Rocky Linux 8 | libvirt-dbus | 1.3.0-2.module+el8.4.0+534+4680a14e | RLSA-2021:0711 |
| Rocky Linux 8 | nbdkit | 1.16.2-4.module+el8.4.0+534+4680a14e | RLSA-2021:0711 |
| Rocky Linux 8 | netcf | 0.2.8-12.module+el8.4.0+534+4680a14e | RLSA-2021:0711 |
| Rocky Linux 8 | perl-Sys-Virt +1 | 6.0.0-1.module+el8.4.0+534+4680a14e | RLSA-2021:0711 |
| Rocky Linux 8 | seabios | 1.13.0-2.module+el8.4.0+534+4680a14e | RLSA-2021:0711 |
| Rocky Linux 8 | sgabios | 1:0.20170427git-3.module+el8.4.0+534+4680a14e | RLSA-2021:0711 |
| Rocky Linux 8 | supermin | 5.1.19-10.module+el8.4.0+534+4680a14e | RLSA-2021:0711 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | qemu | 5.2.0-r0 | — |
| Alpine v3.23 | qemu | 5.2.0-r0 | — |
| Alpine v3.22 | qemu | 5.2.0-r0 | — |
| Alpine v3.21 | qemu | 5.2.0-r0 | — |
| Alpine v3.20 | qemu | 5.2.0-r0 | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | qemu | 5.2.0-r0 | — |
| Alpine v3.18 | qemu | 5.2.0-r0 | — |
| Alpine v3.17 | qemu | 5.2.0-r0 | — |
| Alpine v3.16 | qemu | 5.2.0-r0 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | hivex +6 | 1.3.18-20.module+el8.3.0+7860+a7792d29 | ELSA-2021-0711 |
| Oracle Linux 8 | libguestfs-winsupport | 8.2-1.module+el8.3.0+7860+a7792d29 | ELSA-2021-0711 |
| Oracle Linux 8 | libiscsi +2 | 1.18.0-8.module+el8.3.0+7860+a7792d29 | ELSA-2021-0711 |
| Oracle Linux 8 | libnbd +5 | 1.2.2-1.module+el8.3.0+7860+a7792d29 | ELSA-2021-0711 |
| Oracle Linux 8 | libvirt +28 | 6.0.0-28.0.1.module+el8.3.0+7860+a7792d29 | ELSA-2021-0711 |
| Oracle Linux 8 | libvirt-dbus | 1.3.0-2.module+el8.3.0+7860+a7792d29 | ELSA-2021-0711 |
| Oracle Linux 8 | nbdkit +13 | 1.16.2-4.0.1.module+el8.3.0+7860+a7792d29 | ELSA-2021-0711 |
| Oracle Linux 8 | netcf +2 | 0.2.8-12.module+el8.3.0+7860+a7792d29 | ELSA-2021-0711 |
| Oracle Linux 8 | perl-Sys-Virt +1 | 6.0.0-1.module+el8.3.0+7860+a7792d29 | ELSA-2021-0711 |
| Oracle Linux 8 | qemu-img +10 | 15:4.2.0-34.module+el8.3.0+9669+81410e06.4 | ELSA-2021-0711 |
| Oracle Linux 8 | seabios +2 | 1.13.0-2.module+el8.3.0+7860+a7792d29 | ELSA-2021-0711 |
| Oracle Linux 8 | sgabios +1 | 1:0.20170427git-3.module+el8.3.0+7860+a7792d29 | ELSA-2021-0711 |
| Oracle Linux 8 | supermin +1 | 5.1.19-10.module+el8.3.0+7860+a7792d29 | ELSA-2021-0711 |
| Oracle Linux 8 | virt-dib +25 | 1:1.40.2-25.0.1.module+el8.3.0+7860+a7792d29 | ELSA-2021-0711 |
Advisories 6
- ALSA-2021:0711 Important: virt:rhel and virt-devel:rhel security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2021:0743 Red Hat Security Advisory: virt:8.2 and virt-devel:8.2 security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2021:0711 Red Hat Security Advisory: virt:rhel and virt-devel:rhel security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHBA-2021:0639 Red Hat Bug Fix Advisory: virt:8.3 bug fix and enhancement update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RLSA-2021:0711 Important: virt:rhel and virt-devel:rhel security update Rocky Linux Security Advisories · Feb 5, 2026
- ELSA-2021-0711 Low: virt:ol and virt-devel:ol security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Mar 5, 2021
References
- https://github.com/qemu/qemu/commit/ebf101955ce8f8d72fba103b5151115a4335de2c
- https://bugzilla.redhat.com/show_bug.cgi?id=1915823
- https://www.openwall.com/lists/oss-security/2021/01/22/1
- https://lists.gnu.org/archive/html/qemu-devel/2021-01/msg05461.html
- https://security.netapp.com/advisory/ntap-20210312-0002/
- GLSA-202208-27 vendor-advisory