Description
A flaw was found in the QEMU built-in VNC server while processing ClientCutText messages. A wrong exit condition may lead to an infinite loop when inflating an attacker controlled zlib buffer in the `inflate_buffer` function. This could allow a remote authenticated client who is able to send a clipboard to the VNC server to trigger a denial of service.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
| Red Hat | Red Hat Enterprise Linux 6 | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — |
| Red Hat | Red Hat Enterprise Linux 8 Advanced Virtualization | — | — |
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 | 1:8.0.4+dfsg-1 | — |
| Debian 13 | qemu | 1:8.0.4+dfsg-1 | — |
| Debian 12 | qemu | 1:7.2+dfsg-7+deb12u2 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | qemu | 1:6.2+dfsg-2ubuntu6.16 | USN-6567-1 |
| Ubuntu 20.04 LTS | qemu | 1:4.2-3ubuntu6.28 | USN-6567-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | qemu-img +19 | 17:8.2.0-11.el9_4 | RHSA-2024:2135 |
| RHEL 8 | SLOF | 20210217-2.module+el8.10.0+20141+6faa2812 | RHSA-2024:2962 |
| RHEL 8 | hivex +6 | 1.3.18-23.module+el8.9.0+18724+20190c23 | RHSA-2024:2962 |
| RHEL 8 | libguestfs-winsupport | 8.10-1.module+el8.10.0+19908+9938c7c9 | RHSA-2024:2962 |
| RHEL 8 | libiscsi +2 | 1.18.0-8.module+el8.9.0+18724+20190c23 | RHSA-2024:2962 |
| RHEL 8 | libnbd +6 | 1.6.0-5.module+el8.9.0+18724+20190c23 | RHSA-2024:2962 |
| RHEL 8 | libtpms +1 | 0.9.1-2.20211126git1ff6fe1f43.module+el8.9.0+18724+20190c23 | RHSA-2024:2962 |
| RHEL 8 | libvirt +27 | 8.0.0-23.module+el8.10.0+21023+5962ee04 | RHSA-2024:2962 |
| RHEL 8 | libvirt-dbus | 1.3.0-2.module+el8.9.0+18724+20190c23 | RHSA-2024:2962 |
| RHEL 8 | libvirt-python +1 | 8.0.0-2.module+el8.9.0+18724+20190c23 | RHSA-2024:2962 |
| RHEL 8 | nbdkit +18 | 1.24.0-5.module+el8.9.0+18724+20190c23 | RHSA-2024:2962 |
| RHEL 8 | netcf +2 | 0.2.8-12.module+el8.9.0+18724+20190c23 | RHSA-2024:2962 |
| RHEL 8 | perl-Sys-Virt | 8.0.0-1.module+el8.9.0+18724+20190c23 | RHSA-2024:2962 |
| RHEL 8 | qemu-img +14 | 15:6.2.0-49.module+el8.10.0+21533+3df3c4b6 | RHSA-2024:2962 |
| RHEL 8 | seabios +2 | 1.16.0-4.module+el8.9.0+19570+14a90618 | RHSA-2024:2962 |
| RHEL 8 | sgabios +1 | 1:0.20170427git-3.module+el8.9.0+18724+20190c23 | RHSA-2024:2962 |
| RHEL 8 | supermin +1 | 5.2.1-2.module+el8.9.0+18724+20190c23 | RHSA-2024:2962 |
| RHEL 8 | swtpm +4 | 0.7.0-4.20211109gitb79fd91.module+el8.9.0+18724+20190c23 | RHSA-2024:2962 |
| RHEL 8 | virt-dib +24 | 1:1.44.0-9.module+el8.9.0+18724+20190c23 | RHSA-2024:2962 |
| RHEL 8 | virt-v2v +3 | 1:1.42.0-22.module+el8.9.0+18724+20190c23 | RHSA-2024:2962 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | qemu-img +19 | 17:8.2.0-11.el9_4 | ALSA-2024:2135 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | qemu-kvm | 7:8.2.0-11.el9_4 | RLSA-2024:2135 |
| Rocky Linux 8 | hivex | 1.3.18-23.module+el8.10.0+1590+a67ab969 | RLSA-2024:2962 |
| Rocky Linux 8 | libguestfs | 1:1.44.0-9.module+el8.10.0+1590+a67ab969.rocky | RLSA-2024:2962 |
| Rocky Linux 8 | libguestfs-winsupport | 8.10-1.module+el8.10.0+1451+358d0d76 | RLSA-2024:2962 |
| Rocky Linux 8 | libiscsi | 1.18.0-8.module+el8.10.0+1590+a67ab969 | RLSA-2024:2962 |
| Rocky Linux 8 | libnbd | 1.6.0-5.module+el8.10.0+1590+a67ab969 | RLSA-2024:2962 |
| Rocky Linux 8 | libtpms | 0.9.1-2.20211126git1ff6fe1f43.module+el8.10.0+1590+a67ab969 | RLSA-2024:2962 |
| Rocky Linux 8 | libvirt | 8.0.0-23.1.module+el8.10.0+1779+84732956 | RLSA-2024:2962 |
| Rocky Linux 8 | libvirt-dbus | 1.3.0-2.module+el8.10.0+1590+a67ab969 | RLSA-2024:2962 |
| Rocky Linux 8 | libvirt-python | 8.0.0-2.module+el8.10.0+1590+a67ab969 | RLSA-2024:2962 |
| Rocky Linux 8 | nbdkit | 1.24.0-5.module+el8.10.0+1590+a67ab969 | RLSA-2024:2962 |
| Rocky Linux 8 | netcf | 0.2.8-12.module+el8.10.0+1590+a67ab969 | RLSA-2024:2962 |
| Rocky Linux 8 | perl-Sys-Virt | 8.0.0-1.module+el8.10.0+1590+a67ab969 | RLSA-2024:2962 |
| Rocky Linux 8 | qemu-kvm | 5:6.2.0-49.module+el8.10.0+1752+38c6b60a | RLSA-2024:2962 |
| Rocky Linux 8 | seabios | 1.16.0-4.module+el8.9.0+1408+7b966129 | RLSA-2024:2962 |
| Rocky Linux 8 | sgabios | 1:0.20170427git-3.module+el8.10.0+1590+a67ab969 | RLSA-2024:2962 |
| Rocky Linux 8 | supermin | 5.2.1-2.module+el8.10.0+1590+a67ab969 | RLSA-2024:2962 |
| Rocky Linux 8 | swtpm | 0.7.0-4.20211109gitb79fd91.module+el8.10.0+1590+a67ab969 | RLSA-2024:2962 |
| Rocky Linux 8 | virt-v2v | 1:1.42.0-22.module+el8.10.0+1590+a67ab969 | RLSA-2024:2962 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP5 | qemu | 7.1.0-150500.49.6.1 | SUSE-SU-2023:3082-1 |
| SLES 15 SP4 | qemu | 6.2.0-150400.37.20.1 | SUSE-SU-2023:3234-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLE Micro 5.5 | qemu | 7.1.0-150500.49.6.1 | SUSE-SU-2023:3082-2 |
| SLE Micro 5.4 | qemu | 6.2.0-150400.37.20.1 | SUSE-SU-2023:3234-1 |
| SLE Micro 5.3 | qemu | 6.2.0-150400.37.20.1 | SUSE-SU-2023:3234-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | qemu | 8.0.3-2.1 | openSUSE-SU-2024:13082-1 |
| openSUSE Leap 15.5 | qemu | 7.1.0-150500.49.6.1 | SUSE-SU-2023:3082-1 |
| openSUSE Leap 15.4 | qemu | 6.2.0-150400.37.20.1 | SUSE-SU-2023:3234-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap Micro 5.4 | qemu | 6.2.0-150400.37.20.1 | SUSE-SU-2023:3234-1 |
| openSUSE Leap Micro 5.3 | qemu | 6.2.0-150400.37.20.1 | SUSE-SU-2023:3234-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | qemu | 8.2.0-1 | — |
| Azure Linux 2 (CBL-Mariner) | qemu | 6.2.0-23 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | qemu-img +18 | 17:8.2.0-11.el9_4 | ELSA-2024-2135 |
| Oracle Linux 8 | hivex +4 | 1.3.18-23.module+el8.8.0+21147+1292344f | ELSA-2024-2962, ELSA-2023-12855 |
| Oracle Linux 8 | libguestfs-winsupport | 8.6-1.module+el8.8.0+21147+1292344f | ELSA-2024-2962, ELSA-2023-12855 |
| Oracle Linux 8 | libiscsi +2 | 1.18.0-8.module+el8.8.0+21147+1292344f | ELSA-2024-2962, ELSA-2023-12855 |
| Oracle Linux 8 | libnbd +4 | 1.6.0-5.module+el8.8.0+21147+1292344f | ELSA-2024-2962, ELSA-2023-12855 |
| Oracle Linux 8 | libtpms +1 | 0.9.1-1.20211126git1ff6fe1f43.module+el8.8.0+21147+1292344f | ELSA-2024-2962, ELSA-2023-12855 |
| Oracle Linux 8 | libvirt +27 | 8.0.0-23.0.1.module+el8.10.0+90308+7c659588 | ELSA-2024-2962, ELSA-2023-12855 |
| Oracle Linux 8 | libvirt-client-qemu | 9.0.0-3.module+el8.8.0+21147+1292344f | ELSA-2023-12855 |
| Oracle Linux 8 | libvirt-dbus | 1.3.0-2.module+el8.8.0+21147+1292344f | ELSA-2024-2962, ELSA-2023-12855 |
| Oracle Linux 8 | nbdkit +18 | 1.24.0-4.module+el8.8.0+21147+1292344f | ELSA-2024-2962, ELSA-2023-12855 |
| Oracle Linux 8 | netcf +2 | 0.2.8-12.module+el8.8.0+21147+1292344f | ELSA-2024-2962, ELSA-2023-12855 |
| Oracle Linux 8 | ocaml-hivex +1 | 1.3.18-23.module+el8.9.0+90075+85334608 | ELSA-2024-2962 |
| Oracle Linux 8 | ocaml-libguestfs +1 | 1:1.44.0-9.0.2.module+el8.9.0+90052+d3bf71d8 | ELSA-2024-2962 |
| Oracle Linux 8 | ocaml-libnbd +1 | 1.6.0-5.module+el8.9.0+90052+d3bf71d8 | ELSA-2024-2962 |
| Oracle Linux 8 | perl-Sys-Virt | 8.0.0-1.module+el8.8.0+21147+1292344f | ELSA-2024-2962, ELSA-2023-12855 |
| Oracle Linux 8 | python3-libvirt | 8.0.0-2.module+el8.9.0+90052+d3bf71d8 | ELSA-2024-2962, ELSA-2023-12855 |
| Oracle Linux 8 | qemu-img +14 | 15:6.2.0-49.module+el8.10.0+90330+d0258130 | ELSA-2024-2962, ELSA-2023-12855 |
| Oracle Linux 8 | qemu-virtiofsd | 15:7.2.0-5.module+el8.8.0+21147+1292344f | ELSA-2023-12855 |
| Oracle Linux 8 | seabios +2 | 1.16.0-3.module+el8.8.0+21147+1292344f | ELSA-2024-2962, ELSA-2023-12855 |
| Oracle Linux 8 | sgabios +1 | 1:0.20170427git-3.module+el8.8.0+21147+1292344f | ELSA-2024-2962, ELSA-2023-12855 |
| Oracle Linux 8 | supermin +1 | 5.2.1-2.module+el8.8.0+21147+1292344f | ELSA-2024-2962, ELSA-2023-12855 |
| Oracle Linux 8 | swtpm +4 | 0.7.0-4.20211109gitb79fd91.module+el8.8.0+21147+1292344f | ELSA-2024-2962, ELSA-2023-12855 |
| Oracle Linux 8 | virt-dib +22 | 1:1.44.0-9.0.1.module+el8.8.0+21147+1292344f | ELSA-2024-2962, ELSA-2023-12855 |
| Oracle Linux 8 | virt-v2v +3 | 1:1.42.0-21.module+el8.8.0+21147+1292344f | ELSA-2024-2962, ELSA-2023-12855 |
Advisories 14
- ALSA-2024:2135 Moderate: qemu-kvm security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2024:2962 Red Hat Security Advisory: virt:rhel and virt-devel:rhel security and enhancement update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2024:2135 Red Hat Security Advisory: qemu-kvm security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- USN-6567-1 qemu vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- RLSA-2024:2962 Moderate: virt:rhel and virt-devel:rhel security and enhancement update Rocky Linux Security Advisories · Feb 5, 2026
- RLSA-2024:2135 Moderate: qemu-kvm security update Rocky Linux Security Advisories · Feb 4, 2026
- SUSE-SU-2023:3234-1 Security update for qemu SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:13082-1 qemu-8.0.3-2.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:3082-2 Security update for qemu SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:3082-1 Security update for qemu SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2023-1662 QEMU: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Apr 10, 2025
- ELSA-2024-2962 Moderate: virt:ol and virt-devel:rhel security and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · May 24, 2024
- ELSA-2024-2135 Moderate: qemu-kvm security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · May 2, 2024
- ELSA-2023-12855 Important: kvm_utils3 security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Oct 7, 2023
References
- RHSA-2024:2135 vendor-advisory
- RHSA-2024:2962 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2023-3255 vdb-entry
- RHBZ#2218486 issue-tracking