Description
A potential stack overflow via infinite loop issue was found in various NIC emulators of QEMU in versions up to and including 5.2.0. The issue occurs in loopback mode of a NIC wherein reentrant DMA checks get bypassed. A guest user/process may use this flaw to consume CPU cycles or crash the QEMU process on the host resulting in DoS scenario.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | QEMU | versions up to and including 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-9 | — |
| Debian 13 | qemu | 1:5.2+dfsg-9 | — |
| Debian 12 | qemu | 1:5.2+dfsg-9 | — |
| Debian 10 | qemu | 1:3.1+dfsg-8+deb10u9 | DLA-3099-1 |
| Debian 9 | qemu | 1:2.8+dfsg-6+deb9u14 | DLA-2623-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | qemu | 1:4.2-3ubuntu6.17 | USN-5010-1 |
| Ubuntu 18.04 LTS | qemu | 1:2.11+dfsg-1ubuntu7.37 | USN-5010-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 16.04 LTS | qemu | 1:2.5+dfsg-5ubuntu10.51+esm4 | — |
| Ubuntu Pro 14.04 LTS | qemu | 2.0.0+dfsg-2ubuntu1.47+esm6 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | SLOF | 20191022-3.git899d9883.module+el8.3.0+6423+e4cb6418 | RHSA-2021:3703, RHSA-2021:3061 |
| RHEL 8 | hivex +6 | 1.3.18-21.module+el8.4.0+10770+19c037f9 | RHSA-2021:3703, RHSA-2021:3061 |
| RHEL 8 | libguestfs-winsupport | 8.2-1.module+el8.3.0+6423+e4cb6418 | RHSA-2021:3703, RHSA-2021:3061 |
| RHEL 8 | libiscsi +2 | 1.18.0-8.module+el8.1.0+4066+0f1aadab | RHSA-2021:3703, RHSA-2021:3061 |
| RHEL 8 | libnbd +5 | 1.2.2-1.module+el8.3.0+7353+9de0a3cc | RHSA-2021:3703, RHSA-2021:3061 |
| RHEL 8 | libnbd-bash-completion | 1.6.0-3.module+el8.4.0+9856+bbc47853 | RHSA-2021:3703 |
| RHEL 8 | libtpms +1 | 0.7.4-4.20201106git2452a24dab.module+el8.4.0+10596+32ba7df3 | RHSA-2021:3703 |
| RHEL 8 | libvirt +28 | 6.0.0-35.1.module+el8.4.0+11273+64eb94ef | RHSA-2021:3703, RHSA-2021:3061 |
| RHEL 8 | libvirt-dbus | 1.3.0-2.module+el8.3.0+6423+e4cb6418 | RHSA-2021:3703, RHSA-2021:3061 |
| 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+el8.3.0+6922+fd575af8 | RHSA-2021:3703, RHSA-2021:3061 |
| 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-2021:3703, RHSA-2021:3061 |
| RHEL 8 | perl-Sys-Virt +2 | 6.0.0-1.module+el8.3.0+6423+e4cb6418 | RHSA-2021:3703, RHSA-2021:3061 |
| RHEL 8 | python-pyvmomi +1 | 6.7.1-7.module+el8.4.0+8855+a9e237a9 | RHSA-2021:3703 |
| RHEL 8 | qemu-img +10 | 15:4.2.0-48.module+el8.4.0+11909+3300d70f.3 | RHSA-2021:3703, RHSA-2021:3061 |
| 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+el8.3.0+7353+9de0a3cc | RHSA-2021:3703, RHSA-2021:3061 |
| RHEL 8 | sgabios +1 | 1:0.20170427git-3.module+el8.1.0+4066+0f1aadab | RHSA-2021:3703, RHSA-2021:3061 |
| RHEL 8 | supermin +1 | 5.1.19-10.module+el8.3.0+6423+e4cb6418 | RHSA-2021:3703, RHSA-2021:3061 |
| RHEL 8 | swtpm +3 | 0.4.2-1.20201201git2df14e3.module+el8.4.0+9341+96cf2672 | RHSA-2021:3703 |
| RHEL 8 | virt-dib +25 | 1:1.40.2-27.module+el8.4.0+9282+0bdec052 | RHSA-2021:3703, RHSA-2021:3061 |
| 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 | libguestfs-winsupport | 8.2-1.module_el8.5.0+2608+72063365 | ALSA-2021:3061 |
| AlmaLinux 8 | libiscsi +2 | 1.18.0-8.module_el8.5.0+2608+72063365 | ALSA-2021:3061 |
| AlmaLinux 8 | libnbd +3 | 1.2.2-1.module_el8.5.0+2608+72063365 | ALSA-2021:3061 |
| AlmaLinux 8 | libvirt-dbus | 1.3.0-2.module_el8.5.0+2608+72063365 | ALSA-2021:3061 |
| AlmaLinux 8 | nbdkit +13 | 1.16.2-4.module_el8.5.0+2608+72063365 | ALSA-2021:3061 |
| AlmaLinux 8 | netcf +2 | 0.2.8-12.module_el8.5.0+2608+72063365 | ALSA-2021:3061 |
| AlmaLinux 8 | perl-Sys-Virt +1 | 6.0.0-1.module_el8.5.0+2608+72063365 | ALSA-2021:3061 |
| AlmaLinux 8 | seabios +2 | 1.13.0-2.module_el8.5.0+2608+72063365 | ALSA-2021:3061 |
| AlmaLinux 8 | sgabios +1 | 1:0.20170427git-3.module_el8.5.0+2608+72063365 | ALSA-2021:3061 |
| AlmaLinux 8 | supermin +1 | 5.1.19-10.module_el8.5.0+2608+72063365 | ALSA-2021:3061 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | hivex | 1.3.18-21.module+el8.4.0+642+7e26f5e1 | RLSA-2021:3061 |
| Rocky Linux 8 | libguestfs | 1:1.40.2-27.module+el8.4.0+534+4680a14e | RLSA-2021:3061 |
| Rocky Linux 8 | libguestfs-winsupport | 8.2-1.module+el8.4.0+534+4680a14e | RLSA-2021:3061 |
| Rocky Linux 8 | libiscsi | 1.18.0-8.module+el8.4.0+534+4680a14e | RLSA-2021:3061 |
| Rocky Linux 8 | libnbd | 1.2.2-1.module+el8.4.0+534+4680a14e | RLSA-2021:3061 |
| Rocky Linux 8 | libvirt | 6.0.0-35.1.module+el8.4.0+642+7e26f5e1 | RLSA-2021:3061 |
| Rocky Linux 8 | libvirt-dbus | 1.3.0-2.module+el8.4.0+534+4680a14e | RLSA-2021:3061 |
| Rocky Linux 8 | nbdkit | 1.16.2-4.module+el8.4.0+534+4680a14e | RLSA-2021:3061 |
| Rocky Linux 8 | netcf | 0.2.8-12.module+el8.4.0+534+4680a14e | RLSA-2021:3061 |
| Rocky Linux 8 | perl-Sys-Virt +1 | 6.0.0-1.module+el8.4.0+534+4680a14e | RLSA-2021:3061 |
| Rocky Linux 8 | qemu-kvm | 5:4.2.0-48.module+el8.4.0+534+4680a14e | RLSA-2021:3061 |
| Rocky Linux 8 | seabios | 1.13.0-2.module+el8.4.0+534+4680a14e | RLSA-2021:3061 |
| Rocky Linux 8 | sgabios | 1:0.20170427git-3.module+el8.4.0+534+4680a14e | RLSA-2021:3061 |
| Rocky Linux 8 | supermin | 5.1.19-10.module+el8.4.0+534+4680a14e | RLSA-2021:3061 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP3 | qemu | 5.2.0-17.1 | SUSE-SU-2021:1942-1 |
| SLES 15 SP2 | qemu | 4.2.1-11.16.3 | SUSE-SU-2021:1243-1 |
| SLES 15 SP1 | qemu | 3.1.1.1-9.24.3 | SUSE-SU-2021:1245-1 |
| SLES 15 | qemu | 2.11.2-9.43.1 | SUSE-SU-2021:1244-1 |
| SLES 12 SP5 | qemu | 3.1.1.1-48.2 | SUSE-SU-2021:1242-1 |
Show 22 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP4 | qemu | 2.11.2-5.29.1 | SUSE-SU-2021:1241-1 |
| SLES 12 SP3 | qemu | 2.9.1-6.47.1 | SUSE-SU-2021:1240-1 |
| SLES 12 SP2 | qemu | 2.6.2-41.62.1 | SUSE-SU-2021:1305-1 |
| SLES 11 SP4 | kvm | 1.4.2-60.37.1 | SUSE-SU-2021:14772-1 |
| SLES for SAP 15 SP1 | qemu | 3.1.1.1-9.24.3 | SUSE-SU-2021:1245-1 |
| SLES for SAP 15 | qemu | 2.11.2-9.43.1 | SUSE-SU-2021:1244-1 |
| SLES for SAP 12 SP5 | qemu | 3.1.1.1-48.2 | SUSE-SU-2021:1242-1 |
| SLES for SAP 12 SP4 | qemu | 2.11.2-5.29.1 | SUSE-SU-2021:1241-1 |
| SLES for SAP 12 SP3 | qemu | 2.9.1-6.47.1 | SUSE-SU-2021:1240-1 |
| SLE Micro 5.0 | qemu | 4.2.1-11.16.3 | SUSE-SU-2021:1243-1 |
| SLE HPC 15 SP1 | qemu | 3.1.1.1-9.24.3 | SUSE-SU-2021:1245-1 |
| SLE HPC 15 | qemu | 2.11.2-9.43.1 | SUSE-SU-2021:1244-1 |
| SUSE OpenStack Cloud Crowbar 9 | qemu | 2.11.2-5.29.1 | SUSE-SU-2021:1241-1 |
| SUSE OpenStack Cloud Crowbar 8 | qemu | 2.9.1-6.47.1 | SUSE-SU-2021:1240-1 |
| SUSE OpenStack Cloud 9 | qemu | 2.11.2-5.29.1 | SUSE-SU-2021:1241-1 |
| SUSE OpenStack Cloud 8 | qemu | 2.9.1-6.47.1 | SUSE-SU-2021:1240-1 |
| SUSE Manager Server 4.0 | qemu | 3.1.1.1-9.24.3 | SUSE-SU-2021:1245-1 |
| SUSE Manager Retail Branch Server 4.0 | qemu | 3.1.1.1-9.24.3 | SUSE-SU-2021:1245-1 |
| SUSE Manager Proxy 4.0 | qemu | 3.1.1.1-9.24.3 | SUSE-SU-2021:1245-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | kvm | 1.4.2-53.41.1 | SUSE-SU-2021:14774-1 |
| SUSE HPE Helion OpenStack 8 | qemu | 2.9.1-6.47.1 | SUSE-SU-2021:1240-1 |
| SUSE Enterprise Storage 6 | qemu | 3.1.1.1-9.24.3 | SUSE-SU-2021:1245-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | qemu | 6.1.0-32.1 | openSUSE-SU-2024:11287-1 |
| openSUSE Leap 15.3 | qemu | 5.2.0-17.1 | openSUSE-SU-2021:1942-1 |
| openSUSE Leap 15.2 | qemu +2 | 4.2.1-lp152.9.12.1 | openSUSE-SU-2021:0600-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | qemu | 6.0.0-r1 | — |
| Alpine v3.23 | qemu | 6.0.0-r1 | — |
| Alpine v3.22 | qemu | 6.0.0-r1 | — |
| Alpine v3.21 | qemu | 6.0.0-r1 | — |
| Alpine v3.20 | qemu | 6.0.0-r1 | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | qemu | 6.0.0-r1 | — |
| Alpine v3.18 | qemu | 6.0.0-r1 | — |
| Alpine v3.17 | qemu | 6.0.0-r1 | — |
| Alpine v3.16 | qemu | 6.0.0-r1 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | qemu +26 | 10:3.1.0-8.amzn2.0.11 | ALAS2-2023-2148 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | hivex +6 | 1.3.18-21.module+el8.4.0+20285+126f2e4b | ELSA-2022-9172, ELSA-2021-3061 |
| Oracle Linux 8 | libguestfs-winsupport | 8.2-1.module+el8.3.0+7860+a7792d29 | ELSA-2022-9172, ELSA-2021-3061 |
| Oracle Linux 8 | libiscsi +2 | 1.18.0-8.module+el8.3.0+7860+a7792d29 | ELSA-2022-9172, ELSA-2021-3061 |
| Oracle Linux 8 | libnbd +5 | 1.2.2-1.module+el8.3.0+7860+a7792d29 | ELSA-2022-9172, ELSA-2021-3061 |
| Oracle Linux 8 | libvirt +29 | 5.7.0-32.module+el8.5.0+20482+a450964e | ELSA-2022-9172, ELSA-2021-3061 |
| Oracle Linux 8 | libvirt-dbus | 1.3.0-2.module+el8.3.0+7860+a7792d29 | ELSA-2022-9172, ELSA-2021-3061 |
| Oracle Linux 8 | nbdkit +13 | 1.16.2-4.0.1.module+el8.3.0+7860+a7792d29 | ELSA-2022-9172, ELSA-2021-3061 |
| Oracle Linux 8 | netcf +2 | 0.2.8-12.module+el8.3.0+7860+a7792d29 | ELSA-2022-9172, ELSA-2021-3061 |
| Oracle Linux 8 | perl-Sys-Virt | 4.5.0-5.module+el8.5.0+20482+a450964e | ELSA-2022-9172, ELSA-2021-3061 |
| Oracle Linux 8 | qemu-img +10 | 15:4.2.0-48.module+el8.4.0+20285+126f2e4b.3 | ELSA-2022-9172, ELSA-2021-3061 |
| Oracle Linux 8 | seabios +2 | 1.13.0-2.module+el8.3.0+7860+a7792d29 | ELSA-2022-9172, ELSA-2021-3061 |
| Oracle Linux 8 | sgabios +1 | 1:0.20170427git-3.module+el8.3.0+7860+a7792d29 | ELSA-2022-9172, ELSA-2021-3061 |
| Oracle Linux 8 | supermin +1 | 5.1.19-10.module+el8.3.0+7860+a7792d29 | ELSA-2022-9172, ELSA-2021-3061 |
| Oracle Linux 8 | virt-dib +25 | 1:1.40.2-27.0.1.module+el8.4.0+20093+03a97712 | ELSA-2022-9172, ELSA-2021-3061 |
| Oracle Linux 7 | qemu +12 | 15:4.2.1-15.el7 | ELSA-2022-9123 |
Advisories 26
- ALSA-2021:3061 Moderate: virt:rhel and virt-devel:rhel security and bug fix update AlmaLinux Security Advisories · Nov 2, 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
- WID-SEC-2022-1098 QEMU: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Jun 29, 2026
- RHSA-2021:3061 Red Hat Security Advisory: virt:rhel and virt-devel:rhel security and bug fix update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- USN-5010-1 qemu vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DLA-3099-1 qemu - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2623-1 qemu - security update Debian Security (DSA / DLA) · Mar 9, 2026
- ELSA-2021-3061 Low: virt:ol and virt-devel:ol security and bug fix update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Feb 16, 2026
- RLSA-2021:3061 Moderate: virt:rhel and virt-devel:rhel security and bug fix update Rocky Linux Security Advisories · Feb 4, 2026
- SUSE-SU-2021:1305-1 Security update for qemu SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1240-1 Security update for qemu SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:14772-1 Security update for kvm SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1243-1 Security update for qemu SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:0600-1 Security update for qemu SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1245-1 Security update for qemu SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1241-1 Security update for qemu SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:14774-1 Security update for kvm SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1242-1 Security update for qemu SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1244-1 Security update for qemu SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1942-1 Security update for qemu SUSE / openSUSE Security Updates · Feb 4, 2026
- ALAS2-2023-2148 Moderate: qemu security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Sep 23, 2025
- openSUSE-SU-2021:1942-1 Security update for qemu SUSE / openSUSE Security Updates · May 7, 2025
- openSUSE-SU-2024:11287-1 qemu-6.1.0-32.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
- WID-SEC-2022-1728 Red Enterprise Linux Advanced Virtualization: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 2, 2024
- ELSA-2022-9172 Important: virt:kvm_utils security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Feb 25, 2022
- ELSA-2022-9123 Important: qemu security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Feb 5, 2022
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1932827
- https://www.openwall.com/lists/oss-security/2021/02/26/1
- [debian-lts-announce] 20210410 [SECURITY] [DLA 2623-1] qemu security update mailing-list
- https://security.netapp.com/advisory/ntap-20210507-0002/
- GLSA-202208-27 vendor-advisory
- [debian-lts-announce] 20220905 [SECURITY] [DLA 3099-1] qemu security update mailing-list