CVE-2016-5126: Canonical Ubuntu Linux

High severity, CVSS 7.8. EPSS: 0.7% chance of exploitation in the next 30 days.

Heap-based buffer overflow in the iscsi_aio_ioctl function in block/iscsi.c in QEMU allows local guest OS users to cause a denial of service (QEMU process crash) or possibly execute arbitrary code via a crafted iSCSI asynchronous I/O ioctl call.

Affected products

• Canonical Ubuntu Linux: version 12.04 only; version 14.04 only; version 16.04 only
• Debian Debian Linux: version 8.0 only
• Oracle Linux: version 7 only
• Qemu Qemu: up to and including 2.6.2
• Red Hat Enterprise Linux Desktop: version 7.0 only
• Red Hat Enterprise Linux Eus: version 7.2 only; version 7.3 only; version 7.4 only; version 7.5 only; version 7.6 only; version 7.7 only
• Red Hat Enterprise Linux Server: version 7.0 only
• Red Hat Enterprise Linux Server Aus: version 7.2 only; version 7.3 only; version 7.4 only; version 7.6 only; version 7.7 only
• Red Hat Enterprise Linux Server Tus: version 7.2 only; version 7.3 only; version 7.6 only; version 7.7 only
• Red Hat Enterprise Linux Workstation: version 7.0 only
• Red Hat Openstack: version 6.0 only; version 7.0 only; version 8 only; version 9 only; version 5.0 only
• Red Hat Virtualization: version 3.0 only

Published 2016-06-01. Last modified 2026-06-17.