Description
An integer underflow issue was found in the QEMU VNC server while processing ClientCutText messages in the extended format. A malicious client could use this flaw to make QEMU unresponsive by sending a specially crafted payload message, resulting in a denial of service.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | QEMU | Affected 6.1.0 and later. Will be fixed in 7.2.0-rc0. | — |
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 | 1:7.2+dfsg-1 | — |
| Debian 13 | qemu | 1:7.2+dfsg-1 | — |
| Debian 12 | qemu | 1:7.2+dfsg-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | qemu | 1:6.2+dfsg-2ubuntu6.6 | USN-5772-1 |
| Ubuntu 20.04 LTS | qemu | 1:4.2-3ubuntu6.24 | USN-5772-1 |
| Ubuntu 18.04 LTS | qemu | 1:2.11+dfsg-1ubuntu7.41 | USN-5772-1 |
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+esm1 | USN-5772-1 |
| Ubuntu Pro 14.04 LTS | qemu | 2.0.0+dfsg-2ubuntu1.47+esm2 | USN-5772-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | qemu-img +18 | 17:7.2.0-14.el9_2 | RHSA-2023:2162 |
| RHEL 8 | SLOF | 20210217-1.module+el8.8.0+16781+9f4724c2 | RHSA-2023:2757 |
| RHEL 8 | hivex +6 | 1.3.18-23.module+el8.8.0+16781+9f4724c2 | RHSA-2023:2757 |
| RHEL 8 | libguestfs-winsupport | 8.8-1.module+el8.8.0+16781+9f4724c2 | RHSA-2023:2757 |
| RHEL 8 | libiscsi +2 | 1.18.0-8.module+el8.8.0+16781+9f4724c2 | RHSA-2023:2757 |
| RHEL 8 | libnbd +6 | 1.6.0-5.module+el8.8.0+16781+9f4724c2 | RHSA-2023:2757 |
| RHEL 8 | libtpms +1 | 0.9.1-2.20211126git1ff6fe1f43.module+el8.8.0+18453+e0bf0d1d | RHSA-2023:2757 |
| RHEL 8 | libvirt +27 | 8.0.0-19.module+el8.8.0+18453+e0bf0d1d | RHSA-2023:2757 |
| RHEL 8 | libvirt-dbus | 1.3.0-2.module+el8.8.0+16781+9f4724c2 | RHSA-2023:2757 |
| RHEL 8 | libvirt-python +1 | 8.0.0-2.module+el8.8.0+16781+9f4724c2 | RHSA-2023:2757 |
| RHEL 8 | nbdkit +18 | 1.24.0-5.module+el8.8.0+17308+05924798 | RHSA-2023:2757 |
| RHEL 8 | netcf +2 | 0.2.8-12.module+el8.8.0+16781+9f4724c2 | RHSA-2023:2757 |
| RHEL 8 | perl-Sys-Virt | 8.0.0-1.module+el8.8.0+16781+9f4724c2 | RHSA-2023:2757 |
| RHEL 8 | qemu-img +14 | 15:6.2.0-32.module+el8.8.0+18361+9f407f6e | RHSA-2023:2757 |
| RHEL 8 | seabios +2 | 1.16.0-3.module+el8.8.0+16781+9f4724c2 | RHSA-2023:2757 |
| RHEL 8 | sgabios +1 | 1:0.20170427git-3.module+el8.8.0+16781+9f4724c2 | RHSA-2023:2757 |
| RHEL 8 | supermin +1 | 5.2.1-2.module+el8.8.0+16781+9f4724c2 | RHSA-2023:2757 |
| RHEL 8 | swtpm +4 | 0.7.0-4.20211109gitb79fd91.module+el8.8.0+16781+9f4724c2 | RHSA-2023:2757 |
| RHEL 8 | virt-dib +24 | 1:1.44.0-9.module+el8.8.0+16781+9f4724c2 | RHSA-2023:2757 |
| RHEL 8 | virt-v2v +3 | 1:1.42.0-22.module+el8.8.0+18611+5846c3aa | RHSA-2023:2757 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | qemu-img +18 | 17:7.2.0-14.el9_2 | ALSA-2023:2162 |
| AlmaLinux 8 | SLOF | 20210217-1.module_el8.6.0+2880+7d9e3703 | ALSA-2023:2757 |
| AlmaLinux 8 | hivex +6 | 1.3.18-23.module_el8.6.0+2880+7d9e3703 | ALSA-2023:2757 |
| AlmaLinux 8 | libguestfs-winsupport | 8.8-1.module_el8.8.0+3485+7cffc4a3 | ALSA-2023:2757 |
| AlmaLinux 8 | libiscsi +2 | 1.18.0-8.module_el8.6.0+2880+7d9e3703 | ALSA-2023:2757 |
| AlmaLinux 8 | libnbd +6 | 1.6.0-5.module_el8.6.0+2880+7d9e3703 | ALSA-2023:2757 |
| AlmaLinux 8 | libtpms +1 | 0.9.1-2.20211126git1ff6fe1f43.module_el8.8.0+3553+bd08596b | ALSA-2023:2757 |
| AlmaLinux 8 | libvirt +27 | 8.0.0-19.module_el8.8.0+3553+bd08596b | ALSA-2023:2757 |
| AlmaLinux 8 | libvirt-dbus | 1.3.0-2.module_el8.6.0+2880+7d9e3703 | ALSA-2023:2757 |
| AlmaLinux 8 | nbdkit +18 | 1.24.0-5.module_el8.8.0+3485+7cffc4a3 | ALSA-2023:2757 |
| AlmaLinux 8 | netcf +2 | 0.2.8-12.module_el8.6.0+2880+7d9e3703 | ALSA-2023:2757 |
| AlmaLinux 8 | perl-Sys-Virt | 8.0.0-1.module_el8.6.0+2880+7d9e3703 | ALSA-2023:2757 |
| AlmaLinux 8 | python3-libvirt | 8.0.0-2.module_el8.7.0+3346+68867adb | ALSA-2023:2757 |
| AlmaLinux 8 | qemu-img +14 | 15:6.2.0-32.module_el8.8.0+3553+bd08596b | ALSA-2023:2757 |
| AlmaLinux 8 | seabios +2 | 1.16.0-3.module_el8.7.0+3346+68867adb | ALSA-2023:2757 |
| AlmaLinux 8 | sgabios +1 | 1:0.20170427git-3.module_el8.6.0+2880+7d9e3703 | ALSA-2023:2757 |
| AlmaLinux 8 | supermin +1 | 5.2.1-2.module_el8.7.0+3346+68867adb | ALSA-2023:2757 |
| AlmaLinux 8 | swtpm +4 | 0.7.0-4.20211109gitb79fd91.module_el8.7.0+3346+68867adb | ALSA-2023:2757 |
| AlmaLinux 8 | virt-dib +24 | 1:1.44.0-9.module_el8.7.0+3493+5ed0bd1c.alma | ALSA-2023:2757 |
| AlmaLinux 8 | virt-v2v +3 | 1:1.42.0-22.module_el8.8.0+3553+bd08596b | ALSA-2023:2757 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | hivex | 1.3.18-23.module+el8.10.0+1590+a67ab969 | RLSA-2023:2757 |
| Rocky Linux 8 | libguestfs | 1:1.44.0-9.module+el8.10.0+1590+a67ab969.rocky | RLSA-2023:2757 |
| Rocky Linux 8 | libiscsi | 1.18.0-8.module+el8.10.0+1590+a67ab969 | RLSA-2023:2757 |
| Rocky Linux 8 | libnbd | 1.6.0-5.module+el8.10.0+1590+a67ab969 | RLSA-2023:2757 |
| Rocky Linux 8 | libtpms | 0.9.1-2.20211126git1ff6fe1f43.module+el8.10.0+1590+a67ab969 | RLSA-2023:2757 |
| Rocky Linux 8 | libvirt-dbus | 1.3.0-2.module+el8.10.0+1590+a67ab969 | RLSA-2023:2757 |
| Rocky Linux 8 | libvirt-python | 8.0.0-2.module+el8.10.0+1590+a67ab969 | RLSA-2023:2757 |
| Rocky Linux 8 | nbdkit | 1.24.0-5.module+el8.10.0+1590+a67ab969 | RLSA-2023:2757 |
| Rocky Linux 8 | netcf | 0.2.8-12.module+el8.10.0+1590+a67ab969 | RLSA-2023:2757 |
| Rocky Linux 8 | perl-Sys-Virt | 8.0.0-1.module+el8.10.0+1590+a67ab969 | RLSA-2023:2757 |
| Rocky Linux 8 | sgabios | 1:0.20170427git-3.module+el8.10.0+1590+a67ab969 | RLSA-2023:2757 |
| Rocky Linux 8 | supermin | 5.2.1-2.module+el8.10.0+1590+a67ab969 | RLSA-2023:2757 |
| Rocky Linux 8 | swtpm | 0.7.0-4.20211109gitb79fd91.module+el8.10.0+1590+a67ab969 | RLSA-2023:2757 |
| Rocky Linux 8 | virt-v2v | 1:1.42.0-22.module+el8.10.0+1590+a67ab969 | RLSA-2023:2757 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP4 | qemu | 6.2.0-150400.37.11.1 | SUSE-SU-2023:0671-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLE Micro 5.3 | qemu | 6.2.0-150400.37.11.1 | SUSE-SU-2023:0671-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.4 | qemu +1 | 6.2.0-150400.37.11.1 | SUSE-SU-2023:0671-1 |
| openSUSE Leap 15.4 | qemu-testsuite | 6.2.0-150400.37.11.2 | SUSE-SU-2023:0671-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap Micro 5.3 | qemu | 6.2.0-150400.37.11.1 | SUSE-SU-2023:0671-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | qemu | 7.1.0-r4 | — |
| Alpine v3.23 | qemu | 7.1.0-r4 | — |
| Alpine v3.22 | qemu | 7.1.0-r4 | — |
| Alpine v3.21 | qemu | 7.1.0-r4 | — |
| Alpine v3.20 | qemu | 7.1.0-r4 | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | qemu | 7.1.0-r4 | — |
| Alpine v3.18 | qemu | 7.1.0-r4 | — |
| Alpine v3.17 | qemu | 7.1.0-r4 | — |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | qemu | 6.2.0-18 | — |
| Azure Linux 2 (CBL-Mariner) | qemu | 6.2.0-15 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | qemu-img +17 | 17:7.2.0-14.el9_2 | ELSA-2023-2162 |
| Oracle Linux 8 | hivex +4 | 1.3.18-21.module+el8.7.0+20894+2d7709ab | ELSA-2023-12195, ELSA-2023-12108, ELSA-2023-2757 |
| Oracle Linux 8 | libguestfs-appliance | 1:1.44.0-5.0.1.module+el8.7.0+20916+50473d5a | ELSA-2023-12195, ELSA-2023-2757 |
| Oracle Linux 8 | libguestfs-winsupport | 8.2-1.module+el8.7.0+20894+2d7709ab | ELSA-2023-12195, ELSA-2023-12108, ELSA-2023-2757 |
| Oracle Linux 8 | libiscsi +2 | 1.18.0-8.module+el8.7.0+20894+2d7709ab | ELSA-2023-12195, ELSA-2023-12108, ELSA-2023-2757 |
| Oracle Linux 8 | libnbd +3 | 1.2.2-1.module+el8.7.0+20894+2d7709ab | ELSA-2023-12195, ELSA-2023-12108, ELSA-2023-2757 |
| Oracle Linux 8 | libnbd-bash-completion | 1.6.0-5.module+el8.7.0+20916+50473d5a | ELSA-2023-12195, ELSA-2023-2757 |
| Oracle Linux 8 | libtpms +1 | 0.9.1-0.20211126git1ff6fe1f43.module+el8.7.0+20916+50473d5a | ELSA-2023-12195, ELSA-2023-2757 |
| Oracle Linux 8 | libvirt +29 | 5.7.0-38.module+el8.7.0+20894+2d7709ab | ELSA-2023-12195, ELSA-2023-12108, ELSA-2023-2757 |
| Oracle Linux 8 | libvirt-dbus | 1.3.0-2.module+el8.7.0+20894+2d7709ab | ELSA-2023-12195, ELSA-2023-12108, ELSA-2023-2757 |
| Oracle Linux 8 | libvirt-wireshark | 7.10.0-2.module+el8.7.0+20916+50473d5a | ELSA-2023-12195, ELSA-2023-2757 |
| Oracle Linux 8 | nbdkit +13 | 1.16.2-4.0.1.module+el8.7.0+20894+2d7709ab | ELSA-2023-12195, ELSA-2023-12108, ELSA-2023-2757 |
| Oracle Linux 8 | nbdkit-nbd-plugin +4 | 1.24.0-4.module+el8.7.0+20916+50473d5a | ELSA-2023-12195, ELSA-2023-2757 |
| Oracle Linux 8 | netcf +2 | 0.2.8-12.module+el8.7.0+20894+2d7709ab | ELSA-2023-12195, ELSA-2023-12108, ELSA-2023-2757 |
| Oracle Linux 8 | ocaml-hivex +1 | 1.3.18-23.module+el8.8.0+20990+60c1530a | ELSA-2023-2757 |
| Oracle Linux 8 | ocaml-libguestfs +1 | 1:1.44.0-9.0.1.module+el8.8.0+20990+60c1530a | ELSA-2023-2757 |
| Oracle Linux 8 | ocaml-libnbd +1 | 1.6.0-5.module+el8.8.0+20990+60c1530a | ELSA-2023-2757 |
| Oracle Linux 8 | perl-Sys-Virt | 4.5.0-5.module+el8.7.0+20894+2d7709ab | ELSA-2023-12195, ELSA-2023-12108, ELSA-2023-2757 |
| Oracle Linux 8 | qemu-img +9 | 15:4.2.1-24.module+el8.7.0+20894+2d7709ab | ELSA-2023-12195, ELSA-2023-12108, ELSA-2023-2757 |
| Oracle Linux 8 | qemu-kvm-docs +4 | 15:6.2.0-32.module+el8.8.0+21044+01700444 | ELSA-2023-2757 |
| Oracle Linux 8 | qemu-virtiofsd | 15:6.1.1-5.module+el8.7.0+20916+50473d5a | ELSA-2023-12195 |
| Oracle Linux 8 | seabios +2 | 1.13.0-2.module+el8.7.0+20894+2d7709ab | ELSA-2023-12195, ELSA-2023-12108, ELSA-2023-2757 |
| Oracle Linux 8 | sgabios +1 | 1:0.20170427git-3.module+el8.7.0+20894+2d7709ab | ELSA-2023-12195, ELSA-2023-12108, ELSA-2023-2757 |
| Oracle Linux 8 | supermin +1 | 5.1.19-10.module+el8.7.0+20894+2d7709ab | ELSA-2023-12195, ELSA-2023-12108, ELSA-2023-2757 |
| Oracle Linux 8 | swtpm +4 | 0.7.0-3.20211109gitb79fd91.module+el8.7.0+20916+50473d5a | ELSA-2023-12195, ELSA-2023-2757 |
| Oracle Linux 8 | virt-dib +23 | 1:1.40.2-28.0.4.module+el8.7.0+20894+2d7709ab | ELSA-2023-12195, ELSA-2023-12108, ELSA-2023-2757 |
| Oracle Linux 8 | virt-v2v-man-pages-ja +2 | 1:1.42.0-19.0.1.module+el8.7.0+20916+50473d5a | ELSA-2023-12195, ELSA-2023-2757 |
| Oracle Linux 7 | qemu +12 | 15:4.2.1-24.el7 | ELSA-2023-12065 |
Advisories 14
- ALSA-2023:2757 Moderate: virt:rhel and virt-devel:rhel security, bug fix, and enhancement update AlmaLinux Security Advisories · Nov 2, 2026
- ALSA-2023:2162 Moderate: qemu-kvm security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- USN-5772-1 qemu vulnerabilities Ubuntu Security Notices (USN) · Jun 29, 2026
- RHSA-2023:2757 Red Hat Security Advisory: virt:rhel and virt-devel:rhel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2023:2162 Red Hat Security Advisory: qemu-kvm security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- SUSE-SU-2023:0671-1 Security update for qemu SUSE / openSUSE Security Updates · Feb 4, 2026
- RLSA-2023:2757 Moderate: virt:rhel and virt-devel:rhel security, bug fix, and enhancement update Rocky Linux Security Advisories · Dec 3, 2025
- WID-SEC-2022-1535 QEMU: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Dec 2, 2025
- NCSC-2024-0339 Kwetsbaarheden verholpen in Microsoft Mariner NCSC-NL (Netherlands) · Aug 13, 2024
- ELSA-2023-2757 Moderate: virt:ol and virt-devel:rhel security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · May 23, 2023
- ELSA-2023-2162 Moderate: qemu-kvm security, bug fix, and enhancement update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · May 15, 2023
- ELSA-2023-12195 Important: virt:kvm_utils2 security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Mar 17, 2023
- ELSA-2023-12108 Important: virt:kvm_utils security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Feb 8, 2023
- ELSA-2023-12065 Important: qemu security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jan 23, 2023