CVE-2017-15119: Canonical Ubuntu Linux

High severity, CVSS 8.6. EPSS: 3.3% chance of exploitation in the next 30 days.

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.

Affected products

• Canonical Ubuntu Linux: version 14.04 only; version 16.04 only; version 17.10 only
• Debian Debian Linux: version 9.0 only
• Qemu Qemu: before 2.11.0 (fixed in 2.11.0)
• Red Hat Virtualization: version 4.0 only

Published 2018-07-27. Last modified 2026-06-17.