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The Network Block Device (NBD) server in Quick Emulator (QEMU) before 2.11 is vulnerable to a denial of service issue. It could occur if a client sent large option requests, making the server waste CPU time on reading up to 4GB per request. A client could use this flaw to keep the NBD server from serving other requests, resulting in DoS.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade qemu | May 31, 2018 | Feb 20, 2018 |
| Oracle_linux | — | Upgrade qemu-block-glusterUpgrade qemu-commonUpgrade qemu-kvmUpgrade qemuUpgrade ivshmem-toolsUpgrade qemu-imgUpgrade qemu-system-x86Upgrade qemu-system-aarch64Upgrade qemu-system-aarch64-coreUpgrade qemu-kvm-coreUpgrade qemu-block-iscsiUpgrade qemu-block-rbdUpgrade qemu-system-x86-core | May 15, 2019 | Nov 28, 2017 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Jul 27, 2018 |
| Suse | — | Upgrade qemu-audio-alsaUpgrade qemu-microvmUpgrade qemu-x86Upgrade qemu-ui-spice-coreUpgrade qemu-langUpgrade qemu-s390Upgrade qemu-hw-s390x-virtio-gpu-ccwUpgrade qemu-ksmUpgrade qemu-ui-gtkUpgrade qemu-kvmUpgrade qemu-block-rbdUpgrade qemu-audio-spiceUpgrade qemu-block-iscsiUpgrade qemu-seabiosUpgrade qemu-s390xUpgrade qemu-hw-usb-redirectUpgrade qemu-block-curlUpgrade qemu-chardev-baumUpgrade qemu-vgabiosUpgrade qemu-chardev-spiceUpgrade qemu-toolsUpgrade qemu-hw-display-virtio-gpuUpgrade qemu-audio-ossUpgrade qemu-hw-display-virtio-gpu-pciUpgrade qemu-ppcUpgrade qemu-block-sshUpgrade qemu-guest-agentUpgrade qemu-hw-display-virtio-vgaUpgrade qemu-skibootUpgrade qemu-ipxeUpgrade qemu-armUpgrade qemu-sgabiosUpgrade qemu-ui-cursesUpgrade qemu-ui-openglUpgrade qemu-hw-display-qxlUpgrade qemu-ui-spice-appUpgrade qemuUpgrade qemu-audio-pa | Mar 22, 2018 | Feb 20, 2018 |
| Ubuntu | — | Upgrade qemu-systemUpgrade qemu-system-s390xUpgrade qemu-system-miscUpgrade qemu-system-mipsUpgrade qemu-system-sparcUpgrade qemu-system-x86Upgrade qemu-system-armUpgrade qemu-system-ppcUpgrade qemu-system-aarch64 | Feb 21, 2018 | Feb 20, 2018 |
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